EEE MCQ (Cables)

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Cables Multiple Choice Questions and Answers Preparation for Competition

1.    The insulating material for a cable should have
(a)    low cost   
(b)    high dielectric strength
(c)     high mechanical strength
(d)    all of the above
Ans: d

2.    Which of the following protects a cable against mechanical injury ?
(a)     Bedding   
(b)     Sheath
(c)     Armouring   
(d)     None of the above
Ans: c

3.    Which of the following insulation is used in cables ?
(a)    Varnished cambric   
(b)    Rubber   
(c)     Paper
(d)     Any of the above
Ans: d

4.    Empire tape is
(a)    varnished cambric
(b)    vulcanised rubber
(c)     impregnated paper
(d)     none of the above
Ans: a

5. The thickness of the layer of insulation on the conductor, in cables, depends upon
(a)     reactive power
(b)     power factor
(c)    voltage
(d)    current carrying capacity
Ans: c

6. The bedding on a cable consists of
(a)     hessian cloth    
(b)     jute
(c)    any of the above
(d)    none of the above
Ans: c

7. The insulating material for cables should
(a)     be acid proof
(b)     be non-inflammable
(c)    be non-hygroscopic
(d)    have all above properties
Ans: d

8.    In a cable immediately above metallic sheath _____ is provided.
(a)     earthing connection
(b)     bedding   
(c)     armouring
(d)     none of the above
Ans: b

9.    The current carrying capacity of cables in D.C. is more thanthat in A.C. mainly due to
(a)     absence of harmonics
(b)     non-existence of any stability limit
(c)    smaller dielectric loss
(d)    absence of ripples
(e)    none of the above
Ans: c

10.   In case of three core flexible cable the colour of the neutral is
(a)     blue   
(b)     black
(c)    brown
(d)    none of the above
Ans: a

11    cables are used for 132 kV lines.
(a)     High tension   
(b)     Super tension
(c)    Extra high tension
(d)    Extra super voltage
Ans: d

12.    Conduit pipes are normally used to protect _____ cables.
(a)    unsheathed cables
(b)    armoured
(c)    PVC sheathed cables
(d)    all of the above
Ans: a

13.    The minimum dielectric stress in a cable is at
(a)     armour   
(b)     bedding
(c)    conductor surface
(d)    lead sheath
Ans: d

14.    In single core cables armouring is not done to
(a)     avoid excessive sheath losses
(b)     make it flexible
(c)    either of the above
(d)    none of the above
Ans: a

15.    Dielectric strength of rubber is around
(a)     5 kV/mm   
(b)     15 kV/mm
(c)     30 kV/mm   
(d)     200 kV/mm
Ans: c

16.    Low tension cables are generally used upto
(a)     200 V   
(b)     500 V
(c)     700 V   
(d)     1000 V
Ans: d

17.    In a cable, the maximum stress under operating conditions is at
(a)     insulation layer
(b)     sheath   
(c)     armour
(d)     conductor surface
Ans: d

18.    High tension cables are generally used upto
(a)     11kV   
(b)     33kV
(c)     66 kV   
(d)     132 kV
Ans: a

19.    The surge resistance of cable is
(a)     5 ohms   
(b)     20 ohms
(c)     50 ohms            
(d)     100 ohms
Ans: c

20.    PVC stands for
(a)     polyvinyl chloride
(b)     post varnish conductor
(c)    pressed and varnished cloth
(d)    positive voltage conductor
(e)    none of the above
Ans: a

    In the cables, the location of fault is usually found out by comparing
(a)    the resistance of the conductor
(b)    the inductance of conductors
(c)    the capacitances of insulated conductors
(d)    all above parameters
Ans: c

22.    In capacitance grading of cables we use a ______ dielectric.
(a)     composite   
(b)     porous
(c)     homogeneous    
(d)     hygroscopic
Ans: a

23.    Pressure cables are generally not used beyond
(a)     11 kV   
(b)     33 kV
(c)     66 kV   
(d)     132 kV
Ans: c

24.    The material for armouring on cable is usually
(a)     steel tape
(b)     galvanised steel wire
(c)    any of the above
(d)    none of the above
Ans: c

25.    Cables, generally used beyond 66 kV are
(a)     oil filled   
(b)     S.L. type
(c)     belted   
(d)     armoured
Ans: a

26.    The relative permittivity of rubber is
(a)    between 2 and 3
(b)    between 5 and 6
(c)    between 8 and 10
(d)    between 12 and 14
Ans: a

27.    Solid type cables are considered unreliable beyond 66 kV because
(a)     insulation may melt due to higher temperature
(b)     skin effect dominates on the conduc¬tor
(c)    of corona loss between conductor and sheath material
(d)    there is a danger of breakdown of insulation due to the presence of voids
Ans: d

28.    If the length of a cable is doubled, its capacitance
(a)    becomes one-fourth
(b)    becomes one-half
(c)    becomes double
(d)    remains unchanged
Ans: c

29.    In cables the charging current
(a)    lags the voltage by 90°
(b)    leads the voltage by 90°
(c)    lags the voltage by 180°
(d)     leads the voltage by 180°
Ans: b

30.    A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become
(a)     one half   
(6)     double
(c)    four times   
(d)     none of the above
Ans: a

31.    If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
(a)     5 kV/mm   
(b)     10 kV/mm
(a)     15 kV/mm   
(d)     30 kV/mm
Ans: b

32.    In the cables, sheaths are used to
(a)     prevent the moisture from entering the cable
(b)     provide enough strength
(e)    provide proper insulation
(d)    none of the above
Ans: a

33.    The intersheaths in the cables are used to
(a)     minimize the stress
(b)     avoid the requirement of good insulation
(c)    provide proper stress distribution
(d)    none of the above
Ans: c

34.    The electrostatic stress in underground cables is
(a)     same at the conductor and the sheath
(b)     minimum at the conductor and maximum at the sheath
(c)     maximum at the conductor and minimum at the sheath
(d)    zero at the conductor as well as on the sheath
(e)    none of the above
Ans: c

35.    The breakdown of insulation of the cable can be avoided economically by the use of
(a)    inter-sheaths
(b)    insulating materials with different dielectric constants
(c)    both (a) and (b)
(d)    none of the above
Ans: c

36.    The insulation of the cable decreases with
(a)    the increase in length of the insulation
(b)    the decrease in the length of the insulation
(c)    either (a) or (b)
(d)    none of the above
Ans: a

37.    A cable carrying alternating current has
(a)    hysteresis losses only
(b)    hysteresis and leakage losses only
(c)    hysteresis, leakage and copper losses only
(d)    hysteresis, leakage, copper and friction losses
Ans: b

38.    In a cable the voltage stress is maximum at
(a)     sheath   
(6)     insulator
(e)    surface of the conductor
(d)     core of the conductor
Ans: d

39.    Capacitance grading of cable implies
(a)    use of dielectrics of different permeabilities
(b)    grading according to capacitance of cables per km length
(c)    cables using single dielectric in different concentrations
(d)    capacitance required to be introduced at different lengths to counter the effect of inductance
(e)    none of the above
Ans: a

40.    Underground cables are laid at sufficient depth
(a)     to minimise temperature stresses
(b)     to avoid being unearthed easily due to removal of soil
(c)    to minimise the effect of shocks and vibrations due to gassing vehicles, etc.
(d)    for all of the above reasons
Ans: c

41.    The advantage of cables over overhead transmission lines is
(a)     easy maintenance
(b)     low cost
(c)    can be used in congested areas
(d)    can be used in high voltage circuits
Ans: c

42.    The thickness of metallic shielding on cables is usually
(a)     0.04 mm   
(b)     0.2 to 0.4 mm
(e)    3 to 5 mm   
(d)     40 to 60 mm
Ans: a

43.    Cables for 220 kV lines are invariably
(a)     mica insulated  
(b)     paper insulated
(c)    compressed oil or compressed gas insulated
(d)    rubber insulated
(e)    none of the above
Ans: c

44.    Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?
(a)     Polyvinyle chloride
(b)     Vulcanised rubber
(c)    Impregnated paper
(d)    Compressed SFe gas
(e)    none of the above
Ans: d

45.    If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be
(a)     2 cm   
(b)     10 cm
(c)     50 cm   
(d)     400 cm
Ans: c

46.    Copper as conductor for cables is used as
(a)    annealed
(b)    hardened and tempered
(c)    hard drawn
(d)    alloy with chromium
Ans: a

47.    The insulating material should have
(a)    low permittivity
(b)    high resistivity
(c)    high dielectric strength
(d)    all of the above
Ans: d

48.    The advantage of oil filled cables is
(a)    more perfect impregnation
(b)    smaller overall size
(c)    no ionisation, oxidation and formation of voids
(d)    all of the above
Ans: d

49.    The disadvantage with paper as insulating material is
(a)     it is hygroscopic
(6)     it has high capacitance
(c)    it is an organic material
(d)    none of the above
Ans: a

50.    The breakdown voltage of a cable depends on
(a)     presence of moisture
(b)     working temperature
(c)    time of application of the voltage
(d)    all of the above
Ans: d

51.    It is difficult to maintain oil filled cables.
(a)   Yes
(b)   No
Ans: a

51.    In capacitance grading a homogeneous dielectric is used.   
(a)   Yes
(b)   No
Ans: b

52.    In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables
is often adopted.
(a)   Yes
(b)   No
Ans: a

53.    Natural rubber is obtained from milky sap of tropical trees.
(a)   Yes
(b)   No
Ans: a

54.    Rubber is most commonly used insulation in cables.
(a)   Yes
(b)   No
Ans: a

55.    Polyethylene has very poor dielectric and ageing properties.   
(a)   Yes
(b)   No
Ans: b

56. The metallic sheath may be made of lead or lead alloy or of aluminium.
(a)   Yes
(b)   No
Ans: b

EEE MCQ (A.C. Fundamentals, Circuits and Circuit Theory)

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A.C. Fundamentals, Circuits and Circuit Theory - Electrical engineering multiple choice questions and answers for competitive exams

1. A sine wave has a frequency of 50 Hz. Its angular frequency is _______ radian/second.
(a) 100 n
(b) 50 jt
(c) 25 jt
(d) 5 n

Ans: a

2. The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_____ohms.
(a) 2.5
(b) 5
(c) 10
(d) 15

Ans: c

3. The period of a wave is
(a)    the same as frequency
(6)    time required to complete one cycle
(c) expressed in amperes
(d) none of the above

Ans: b

4. The form factor is the ratio of
(a)    peak value to r.m.s. value
(6)    r.m.s. value to average value
(c) average value to r.m.s. value
(d) none of the above

Ans: b

5. The period of a sine wave is _____ seconds.
Its frequency is
(a) 20 Hz
(b) 30 Hz
(c) 40 Hz
(d) 50 Hz

Ans: d

6. A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to
(a)  average voltage
(b)  r.m.s. voltage  
(c)     peak voltage
(d)  none of the above
Ans: b

7. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
(a) a sinusoid of the same frequency
(b) a sinusoid of half the original frequency
(c) a sinusoid of double the frequency
(d) not a sinusoid
Ans: a

8.   The peak value of a sine wave is 200 V. Its average value is
(a) 127.4 V
(b) 141.4 V
(c) 282.8 V
(d)200V
Ans: a

9. If two sine waves of the same frequency have a phase difference of JT radians, then
(a) both will reach their minimum values at the same instant
(b) both will reach their maximum values at the same instant
(c) when one wave reaches its maximum value, the other will reach its minimum value
(d) none of the above
Ans: c

10. The voltage of domestic supply is 220V. This figure represents
(a) mean value    
(b) r.m.s. value
(c) peak value
(d) average value
Ans: a

11. Two waves of the same frequency have opposite phase when the phase angle between them is
(a) 360°
(b) 180°
(c) 90°
(d) 0°
Ans: b

12. The power consumed in a circuit element will be least when the phase difference between the current and
voltage is
(a) 180"
(b) 90°
(c) 60°
(d) 0°
Ans: b

13. The r.m.s. value and mean value is the same in the case of
(a) triangular wave
(6) sine wave
(c) square wave
(d) half wave rectified sine wave
Ans: c

14. For the same peak value which of the following wave will 'have the highest r.m.s. value ?
(a) square wave
(b) half wave rectified sine wave
(c) triangular wave
(d) sine wave
Ans: a

15. For the same peak value, which of the following wave has the least mean value ?
(a) half wave rectified sine wave
(b) triangular wave
(c) sine wave
(d) square wave
Ans: a

16. For a sine wave with peak value Imax the r.m.s. value is
(a) 0.5 Imax
(b) 0.707
(c) 0.9
(d) 1.414 Lmax
Ans: b

17. Form Factor is the ratio of
(a) average value/r.m.s. value
(b) average value/peak value
(e) r.m.s. value/average value
(d) r.m.s. value/peak value
Ans: c

18. Form factor for a sine wave is
(a) 1.414
(b) 0.707
(c) 1.11
(d) 0.637
Ans: c

19. For a sine wave with peak value Emax______8.30. the average value is
(a) 0.636 Emax
(b) 0.707 Emax
(c) 0.434 EWc
(d) lAUEmax
Ans: a

20. For a frequency of 200 Hz, the time period will be
(a) 0.05 s
(b) 0.005 s
(c) 0.0005 s
(d) 0.5 s
Ans: b

21. The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that
(a) both waves must have same frequency
(b) both   waves  must  have identical peak values
(c) both waves must have zero value at the same time
(d) none of the above
Ans: a

22. The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.
(a) 90
(b) 60
(c) 45
(d) 30
Ans: c

23. Capacitive reactance is more when
(a)     capacitance is less and frequency of supply is less
(b)     capacitance is less and frequency of supply is more
(c) capacitance is more and frequency of supply is less
(d) capacitance is more and frequency of supply is more
Ans: a

24. In a series resonant circuit, the impedance of the circuit is
(a) minimum
(b) maximum
(c) zero
(d) none of the above
Ans: a

25. Power factor of an electrical circuit is equal to
(a) R/Z
(b) cosine of phase angle difference between current and voltage
(c) kW/kVA
(d) ratio of useful current to total current Iw/I
(e) all above
Ans: e

26. The best place to install a capacitor is
(a) very near to inductive load
(b) across the terminals of the inductive load
(c) far away from the inductive load
(d) any where
Ans: b

27. Poor power factor
(a)     reduces load handling capability of electrical system
(b)     results in more power losses in the electrical system
(c)  overloads alternators, transformers and distribution lines
(d)  results in more voltage drop in the line
(e)  results in all above
Ans: e

28. Capacitors for power factor correction are rated in
(a) kW
(b) kVA
(c) kV
(d) kVAR
Ans: d

29. In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value
(a) will change the maximum value of current at resonance
(6) will change the resonance frequency
(c) will change the impedance at resonance frequency
(d) will increase the selectivity of the circuit
Ans: d

30. Pure inductive circuit
(a) consumes some power on average
(b) does not take power at all from a line
(c) takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
(d) none of the above
Ans: c

31. Inductance affects the direct current flow
(a) only at the time of turning off
(b) only at the time of turning on
(c) at the time of turning on and off
(d) at all the time of operation
Ans: c

32. Inductance of a coil Varies
(a)     directly as the cross-sectional area of magnetic core
(b)     directly  as  square  of number of turns
(c) directly as the permeability of the core
(d) inversely as the length of the iron path
(e) as (a) to (d)
Ans: e

33. All the rules and laws of D.C. circuit also apply to A.C. circuit containing
(a) capacitance only
(b) inductance only
(c) resistance only
(d) all above
Ans: c

34. Time constant of an inductive circuit
(a) increases with increase of inductance and decrease of resistance
(b) increases with the increase of inductance and the increase of resistance
(c) increases with decrease of inductance and decrease of resistance
(d) increases with decrease of inductance and increase of resistance
Ans: a

35. Power factor of an inductive circuit is usually improved by connecting capacitor to it in
(a) parallel
(b) series
(c) either (a) or (b)
(d) none of the above
Ans: a

36. In a highly capacitive circuit the
(a) apparent power is equal to the actual power
(b) reactive power is more than the apparent power
(c) reactive power is more than the actual powetf
(d) actual power is more than its reactive power
Ans: c

37. Power factor of the following circuit will be zero
(a) resistance
(b) inductance
(c) capacitance      
(d) both (b) and (c)
Ans: d

38. Power factor of the following circuit will be unity
(a) inductance
(b) capacitance
(c) resistance
(d) both (a) and (b)
Ans: c

39. Power factor of the system is kept high
(a) to reduce line losses
(b) to maximise the utilization of the capacities of generators, lines and transformers
(c) to reduce voltage regulation of the line
(d) due to all above reasons
Ans: d

40. The time constant of the capacitance circuit is defined as the time during which voltage
(a) falls to  36.8% of its final steady value
(b) rises to 38.6% of its final steady value
(c) rises to 63.2% of its final steady value
(d) none of the above
Ans: c

41. In a loss-free R-L-C circuit the transient current is
(a) oscillating
(b) square wave
(c) sinusoidal
(d) non-oscillating
Ans: c

42. The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces
(a) the more heat than produced by A.C. when flowing through the same circuit
(b) the same heat as produced by A.C. when flowing through the same circuit
(c) the less heat than produced by A.C. flowing through the same circuit
(d) none of the above
Ans: b

43. The square waveform of current has following relation between r.m.s. value and average value.
(a) r.m.s. value is equal to average value
(b) r.m.s. value of current is greater than average value
(c) r.m.s. value of current is less than average value
(d) none of the above
Ans: a

44. The double energy transient occur in the
(a) purely inductive circuit
(b) R-L circuit
(c) R-C circuit
(d)     R-L-C circuit
Ans: d

45. The transient currents are associated with the
(a) changes in the stored energy in the inductors and capacitors
(b) impedance of the circuit
(c) applied voltage to the circuit
(d) resistance of the circuit
Ans: a

46. The power factor at resonance in R-L- C parallel circuit is
(a) zero
(b) 0.08 lagging
(c) 0.8 leading
(d) unity
Ans: d

47. In the case of an unsymmetrical alternating current the average value must always be taken over
(a) unsymmetrical part of the wave form
(b) the quarter cycle
(c) the half cycle
(d) the whole cycle
Ans: d

48. In a pure resistive circuit
(a) current lags behind the voltage by 90°
(b) current leads the voltage by 90°
(c) current can lead or lag the voltage by 90°
(d)     current is in phase with the voltage
Ans: d

49. In a pure inductive circuit
(a) the current is in phase with the voltage
(b) the current lags behind the voltage by 90°
(c) the current leads the voltage by 90°
(d) the current can lead or lag by 90°
Ans: b

50. In a circuit containing R, L and C, power loss can take place in
(a) C only
(b) L only
(c) R only
(d) all above
Ans: c

51. Inductance of coil
(a) is unaffected by the supply frequency
(b) decreases with the increase in supply frequency
(c) increases with the increase in supply frequency
(d) becomes zero with the increase in supply frequency
Ans: c

52. In any A.C. circuit always
(a) apparent power is more than actual power
(b) reactive power is more than apparent power
(c) actual power is more than reactive power
(d) reactive power is more than actual power
Ans: a

53. Which of the following circuit component opposes the change in the circuit voltage ?
(a) Inductance      
(b) Capacitance
(c) Conductance    
(d) Resistance
Ans:

54. In a purely inductive circuit
(a) actual power is zero
(b) reactive power is zero
(c) apparent power is zero
(d) none of above is zero
Ans: a

55. Power factor of electric bulb is
(a) zero
(b) lagging
(c) leading
(d) unity
Ans: d

56. Pure inductive circuit takes power from the A.C. line when
(a) applied voltage decreases but cur¬rent increases
(b) applied voltage increases but cur¬rent decreases
(c) both applied voltage and current increase
(d) both applied voltage and current decrease
Ans: a

57. Time constant of a circuit is the time in seconds taken after the application of voltage to each
(a) 25% of maximum value
(b) 50% of maximum value
(c)     63% of maximum value
(d)     90% of the maximum value
Ans: c

58. Time constant of an inductive circuit
(a)     increases with increase of inductance and decrease of resistance
(b)     increases with the increase of inductance and the increase of resistance
(c) increases with the decrease of inductance and decrease of resistance
(d) increases with decrease of inductance and increase of resistance
Ans: a

59. Time constant of a capacitive circuit
(a)     increases with the decrease of capacitance and decrease of resistance
(b)     increases with the decrease of capacitance and increase of resis¬tance
(c) increases with the increase of capacitance and decrease of resis¬tance
(d) increase with increase of capacitance and increase of resis¬tance
Ans: d

60. Magnitude of current at resonance in R-L-C circuit
(a) depends upon the magnitude of R
(b) depends upon the magnitude of L
(c) depends upon the magnitude of C
(d) depends upon the magnitude of R, LandC
Ans: a

61. In a R-L-C circuit
(a) power is consumed in resistance and is equal to I R
(b) exchange of power takes place between inductor and supply line
(c) exchange of power takes place between capacitor and supply line
(d) exchange of power does not take place between resistance and the supply line
(e)     all above are correct
Ans: e

62. In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of
(a) R only
(b) L only
(c) C only
(d) L or C
(e) R,L or C
Ans: d

63. In a series L-C circuit at the resonant frequency the
(a)    current is maximum
(b)    current is minimum
(c)  impedance is maximum
(d)  voltage across C is minimum
Ans: a

64. The time constant of a series R-C circuit is given by
(a) R/C
(b) RC2
(c) RC
(d) R2C
Ans: c

65. If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be
(a) 0.001 s
(b) 0.1 s
(c) 10 s
(d) 100 s
Ans: b

66. Which of the following coil will have large resonant frequency ?
(a) A coil with large resistance
(b) A coil with low resistance
(c) A coil with large distributed capacitance
(d) A coil with low distributed capacitance
Ans: c

67. If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave ?
(a) 42.42 sin 3141
(b) 60 sin 25 t
(c) 30 sin 50 t
(d) 84.84 sin 25 t
Ans: a

68. The safest value of current the human body can carry for more than 3 second is
(a) 4 mA
(b) 9 mA
(c) 15 mA
(d) 25 mA
Ans: b

69. A pure inductance connected across 250 V, 50 Hz supply consumes 100 W.
This consumption can be attributed to
(a) the big size of the inductor
(b) the reactance of the inductor
(c) the current flowing in the inductor
(d) the statement given is false
Ans: d

70. The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA
The power drawn by the circuit is
(a) 12 kW
(b) 22 kW
(c) 32 kW
(d) 64 kW
Ans: c

71. The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of
(a)     iron loss in core
(b)     skin effect
(c) increase in temperature
(d) capacitive effect between adjacent coil turns
Ans: a

72. In an AC. circuit, a low value of kVAR compared with kW indicates
(a) low efficiency
(b) high power factor
(c) unity power factor
(d) maximum load current
Ans: b

73. In AC. circuits, laminated iron is invariably used in order to
(a) reduce eddy current loss
(b) increase heat radiation
(c) make assembly cheap and easier
(d) reduce circuit permeability
Ans: a

74. The ratio of active power to apparent power is known as factor.
(a) demand
(b) load
(c) power
(d) form
Ans: c

75. All definitions of power factor of a series R-L-C circuit are correct except
(a)     ratio of net reactance and impedance
(b)     ratio of kW and kVA
(c) ratio of J and Z
(d) ratio of W and VA
Ans: a

76. The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is
(a) 4 kVAR
(b) 6 kVAR
(c) 8 kVAR
(d) 16 kVAR
Ans: b

77. What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value ?
(a) 0°
(b) 45°
(c) 90°
(d) 180°
Ans: c

78. The purpose of a parallel circuit resonance is to magnify
(a) current
(b) voltage
(c) power
(d) frequency
Ans: b

79. In an A.C. circuit power is dissipated in
(a)     resistance only
(b)     inductance only
(c) capacitance only
(d) none of the above
Ans: a

80. In a parallel R-C circuit, the current always______the applied voltage
(a)     lags
(b)     leads
(c) remains in phase with
(d) none of the above
Ans: b

81. At very low frequencies a series R-C circuit behaves as almost purely
(a)     resistive
(b)     inductive
(c) capacitive
(d) none of the above
Ans: c

82. Skin effect occurs when a conductor carries current at _____ frequencies.
(a) very low
(b) low
(c) medium
(d) high
Ans: d

83. At ______ frequencies the parallel R-L circuit behaves as purely resistive.
(a) low
(b) very low
(c) high
(d) very high
Ans: d

84. In a sine wave the slope is constant
(a)     between 0° and 90°
(b)     between 90° and 180°
(c)  between 180° and 270°
(d)  no where
Ans: d

85. The  power is measured in terms of decibles in case of
(a)     electronic equipment
(b)     transformers
(c) current transformers
(d) auto transformers
Ans: a

86. Capacitive susceptance is a measure of
(a)     reactive power in a circuit
(b)     the extent of neutralisation of reactive power in a circuit
(c) a purely capacitive circuit's ability to pass current
(d) a purely capacitive circuit's ability to resist the flow of current
Ans: c

87. Which of the following statements pertains to resistors only ?
(a)     can dissipate considerable amount of power
(6)     can act as energy storage devices
(c) connecting them in parallel in¬creases the total value
(d) oppose sudden changes in voltage
Ans: a

88. Which of the following refers to a parallel circuit ?
(a)     The current through each element is same
(b)     The voltage across element is in proportion to it's resistance value
(c) The equivalent resistance is greater than any one of the resistors
(d) The current through any one element is less than the source current
Ans: d

89. Aphasoris
(a) a line which represents the mag¬nitude and phase of an alternating quantity
(b) a line representing the magnitude and direction of an alternating quantity
(c)     a coloured tag or band for distinction between different phases of a 3-phase supply
(d)     an instrument used for measuring phases of an unbalanced 3-phase load
Ans: a

89. A parallel AC. circuit in resonance will
(a) have a high voltage developed across each inductive and capacitive section
(b) have a high impedance
(c) act like a resistor of low value
(d) have current in each section equal to the line current
Ans: b

90. Wire-wound resistors are unsuitable for use at high frequencies because they
(a) create more electrical noise
(b) are likely to melt under excessive eddy current heat
(c) consume more power
(d) exhibit unwanted inductive and capacitive effects
Ans: d

91. The inductance of a coil can be increased by
(a)     increasing core length
(b)     decreasing the number of turns
(c) decreasing the diameter of the former
(d) choosing core material having high relative permeability
Ans: d

92. In a three-phase supply floating neutral is undesirable because it way give rise to
(a) high voltage across the load
(b) low voltage across the load
(c) unequal line voltages across the load
Ans: c

93. Which of the following waves has the highest value of peak factor ?
(a) Square wave  
(b) Sine wave
(c) Half wave rectified sine wave
(d) Triangular wave
Ans: c

94. The frequency of domestic power supply in India is
(a) 200 Hz
(b) 100 Hz
(c) 60 Hz
(d) 50 Hz
Ans: d

95. The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be
(a) 282.8 V
(b) 141.4 V
(c) 111 V
(d) 100 V
Ans: a

96. The r.m.s. value of pure cosine function is
(a) 0.5 of peak value
(b) 0.707 of peak value
(c) same as peak value
(d) zero
Ans: b

97. Ohm is unit of all of the following except
(a) inductive reactance
(b) capacitive reactance
(c) resistance
(d)     capacitance
Ans: d

98. The series ;nd parallel resonance on L-C circui' differs in that
(a) series resistance needs a low-resistance ource for sharp rise in current
(b) series resonance needs a high-resistance source for sharp increase in current
(c) parallel resonance needs a low-resistance source for a sharp in¬crease in impedance
(d) parallel resonance needs a low-resistance source for a sharp rise in line current
Ans: a

99. The phasors for which of the following pair are 180° out of phase for VL, VC and VR?
(a) Vc and VR
(b) VL and VR
(c) Vc and VL
(d) none of the above
Ans: c

100.   The frequency of an alternating current is
(a) the speed with which the alternator runs
(b) the number of cycles generated in one minute
(c) the number of waves passing through a point in one second
(d) the number of electrons passing through a point in one second
Ans: c

101. A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to
(a) the capacitive reactance in ohms
(b) the current flowing in capacitor
(c) the size of the capacitor being quite big
(d) the statement is incorrect
Ans: d

102. The power factor of a D.C. circuit is always
(a) less than unity
(b) unity
(c) greater than unity
(d) zero
Ans: b

103. The product of apparent power and cosine of the phase angle between circuit voltage and current is
(a) true power
(b) reactive power
(c) volt-amperes
(d) instantaneous power
Ans: a

104. The equation of 50 Hz current sine wave having r.m.s. value of 60 A is
(a) 60 sin 25 t
(b) 60 sin 50 t
(c) 84.84 sin 3141
(d) 42.42 sin 314 t
Ans: c

105. An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms,
(a) the current through the resistance is more
(b) the current through the resistance is less
(c) both resistance and inductance carry equal currents
(d) none of the above
Ans: c

106. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will
(a)     be reduced by half
(b)     be doubled
(c) be four times as high
(d) be reduced to one fourth
Ans: b

107. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will
(a) be reduced by half
(b) be doubled
(c) be four times at high
(d) be reduced to one fourth
Ans: a

108. When an alternating current passes through an ohmic resistance the electrical power converted into heat is
(a) apparent power
(b) true power
(c) reactive power
(d) none of the above
Ans: b

109. In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters ?
(a)     220 V
(b)     220V3V
(c) 220/V3 V
(d) none of the above
Ans: a

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HR Interview Questions tips

Hello, how are you today ?

This is more of a “make yourself comfortable” statements. Answer with a pleasant smile. If you had any trouble during the day, don’t hesitate to mention it. But make sure you express it in a positive note.

Examples:

·         “I am very well today sir, thank you”.

·         “I am very well today sir, just that the traffic here is bit of a hassle. But I made sure, I start a bit early to beat it.”

Tell me about yourself.

The FIRST & BEST question for any HR interview. The answer to this basically sets the tone of rest of the interview. Good news is – You can earn a lot of points if this is answered right.

·         Give a brief of your education background (up to plus two is fine, your family and location, any of your hobbies etc.

·         You can also mention one of your major achievements, if it fits the circumstance.

·         Keep the answer to just about 3-4 sentences and not more than that.

·         No need to explain your strengths & weakness at this points (as that will definitely come along).

·         A common mistake seen is most HR interview is to start the sentence like “I am basically from...” No need to start a sentence like that.

·         Keep the answer simple, to the point and give space and time for further questions. Do not stretch it too much.

Example:

“Hi I am Kiran and hails from Bangalore. I did my B.Tech in electronics and communication from Rameswara College of engineering, which is under Bangalore University. I had completed my plus two from Chinmaya Vidhya Mission School and secured 98% in CBSE Boards. I have four members in my family and I am the youngest son. I love outdoor sports, specifically athletics and was a member of college athletic team.”

What are your key strengths ?

This is another most common question in any HR interview. The idea here is to understand how much you know about yourself and how confident you are about your strengths.

·         Just stay positive. Even a simple answer like “I am a very positive person” is good enough.

·         You can also change this as per the requirement of the interview. Knowing a bit about the profile you are being interviewed helps as well.

·         Explaining your strength with an experience from the past is desirable here.

Example:

·         “Sir, my greatest strength is my ability to learn things quickly. For example, I had to represent my college in an inter college science exhibition, and was introduced to the team at the very last minute. I was able to understand our exhibits and artifacts and present them with great success”.

·         “I think my greatest strength is my positive attitude, even during the most hardest of times. During my college project, there has been couple of occasions, when our idea was not falling in place and the results were negative. I had to believe and think positively and keep my team motivated to persist on our idea, and finally we got the desired result.”

·         “My best skill would be my verbal ability and articulation skill. I have worked as editor for our college magazine and have been involved with various literary forums during my school and college days.

What is one thing, which you want to improve about yourself ? (OR) what are your weaknesses ?

This is a trick question. The expectation here is to answer a negative trait with a positive twist. Something which in general a weak point of a person, but is alright from an organization perspective.

Example

·         “I tend to try to take up too many things, leaving little time for myself.”

·         “I am a perfectionist and sometimes, concentrate too much on one single task to get it to perfection, using up time from other tasks”.

·         “I tend to say Yes, when someone asks for help. I am working on learning to say No at times”.

Where do you see yourself in 5 years from now ?

This is a question intended to know, what are your career aspirations, how long would you be committed to the organization, is there any immediate plans for you to move on etc. If you have an actual plan, explain it with reasoning. If you do not have any specific plans as of then, give a generic answer along with some interesting activity you would like to take up.

Example

·         “I would like to see myself donning one of the senior positions in the organization contributing to technology as well as participating in business growth. I am hoping, I can position myself with relevant experience by then.”

·         “As a fresher, I am assuming by first five years will be a huge learning curve. I want to absorb much of the industry knowledge and also to sharpen my technical abilities. In next five years I see myself playing various roles in the team from a developer to leading a team.”

·         “I would like to see myself as a technical architect in next five years. My core competency is with technologies, and I would like to work and contribute in the field of most recent technologies and advancements. I would like to get take up some of the major technology certifications”

Have you been in some challenging situation ? Explain how you handled it ?

This is usually an add-on question to explain your strengths that you mention previously. This is good opportunity to give a suitable example, as to why you mentioned what your strengths are.

Example:

·         “Yes, we did have some challenging situation during our final semester project delivery. Usually the kind of code logic we were trying to implemented, works with a 64bit processor, while we were trying to make it work with a lower configuration, due to budgetary constraints”. Theoretically it was possible, but result was not coming through and the team wanted to give up and upgrade the hardware. I was positive, that this will work and that we stick to the plan and figure out our actual problem. It took some effort to convince my team, a lot more hard work and few extra hours of reading, but finally we stayed positive and cracked the issue and delivered the project.

o    The above example, explains your strength like Positive thinking, hard work etc.

·         “I have a huge passion for sports and have been a regular member of college athletic team. There was an event coming up slightly ahead of one of our exam schedule. Although our coach said, I can  skip the competition, I was sure I can win points for the college. So I decided, I will put in extra time in studies late evenings, while also practicing and attending the event. I had to stretch a bit physically & mentally, and also manage my time tightly. But finally I was able to win the tournament and also come out with good scores in exam. 

o    The above showcases, you multitasking capability, time management, passion for things and hard work.

Why should we hire you ? 

As a fresher, you can’t commit to any expertise in any specific domain. So this question is intended to understand what quality of yours will be helpful most for the company. Knowledge about company and what quality of yours suits the organization, is the key to answer this. In case you don’t know much about the company, quick learning ability, flexibility, team player etc are few common qualities that will fit any organizational needs.

Example:

·         “I have had some internships and industry exposure. So being a fresher, it will still be easy for me adapt to the new environment, which is significantly lessen my training cost.”

·         “I have a sharp learning curve, which will help company ramp me up quickly as a productive resource. An example of my learning curve is my final year project, where I have worked on a short time frame on an entirely new technology”

·         “I am a strong team player a good leader. I have been leading teams for technical and cultural activities during my college days. In your company I will be a great player within any challenging team and provide leadership when opportunity arises”.

What are your hobbies and interests ? 

You cannot say, you don’t have any other interests, other than academics. Even if you are very studious, your answer should include reading non-textbooks and following cutting edge stuffs in technology. A company looks for a candidate who are more rounded and keeps diverse interests in life. Identify one of your interests other than academics and prepare answer based on that (Don’t include eating, watching TV, sleeping etc.)

Example:

·         “I love singing and I also play instruments like Guitar.”

·         “Outdoor sports is my interest. Specifically cricket”

·         “I am a numismatist (coin/ currency collector). I have been doing it since school days”

Who is the most inspiring person in your life

The important part is not who, but why? When you answer this question with a name, you should follow it up with why he / she is most inspiring person.

Example:

·         “My greatest inspiration is Sachin Tendulkar. He had such a humble upbringing & his hard work took him to the greatest heights in the world of sports. He still keeps himself rooted and stays humble. I also believe in hard work and humility”.

·         “My greatest inspiration is my dad. He has always thought me to not worry about my weakness and take most advantage of my strengths. This has developed a lot of confidence in me during difficult times.”

Are you willing to change your role and profile when required for project?

As a fresher, your most sought after quality is flexibility. You need to showcase, you are flexible and ready to learn. Saying you are flexible doesn’t necessarily mean, you will be forced into things, you don’t like. It just shows your positive attitude to learn and try new things.

Example:

“Yes, most definitely sir. As a fresher, I hope and wish to learn as much things as possible. I believe taking up different roles and profiles only helps me learn and grow in this industry”

Are you ready to relocate

As long as you do not have any compelling reasons, being a fresher it is better to be ready for relocation. Today’s IT industry works on global operation model, where they have offices located at several locations. These are staffed strategically, as per need and business requirement and there could be a need for your skills at a particular location.

Being flexible enough to suit the staffing need of a company is a great advantage for a fresher and since most of fresher move around with less baggage (example: being single), it is easier for company to move them at short notice. Remember, this applies for a foreign country placement also. So denying a relocation means, you are also saying “No” to an onsite opportunity as well.

Example:

·         “Yes, most definitely. I believe being at different locations helps me learn about new culture and people.”

·         “Yes, I don’t see a problem in relocation. It’s always a better learning experience than being around with same environment and people”

Are you flexible with timings (if have to work in shift) ? 

This question yet again checks about your flexibility. The same answer above applies here. If there is a genuine problem for you to work in night or early morning shifts, mention that.

Do you wish to pursue higher education?

If you are seriously considering higher education, it’s wise to say so.

·         If you are unsure (may be – May not be), your answers could be –

o    “I am interested in higher studies, but not immediately. I want to get started working and then look for higher education based on my experience and career progressions.”

o    “Yes, but not immediately. I plan to take up part time studies, with either an MBA or an VLSI engineering masters, depending on which will be more beneficial for my line of work.”

·          Some companies support and provide various incentives for part time, full time studies. If you already know of any such programs, it will be good to align your answer according to that.

Interview Questions on about Company

In today’s world, with so much information available online and through various sources, it is a grave mistake to not read up about the company, you are attending the interview for. A good knowledge about the company during the interview shows your genuine interest in getting placed. Few basic things that you need to look up about a company are

·         Domain expertise of the company

·         Various industries they cater to

·         Few niceties about being employed at that company (Eg: Best employer award by Times magazine)

·         Locations they operate from and main business geographies.

·         Company history, its current leaders

·         General working culture

·         Any subsidiaries or affiliated companies

Why do you want to work for us?

Mention some good word about the company at the same time, try to align a strength of yours with the company vision or goal or working culture.

Example

·         “Working for an organization, which has won best employer award multiple times, in itself is a motivating factor. But more importantly, I would like to start off my career at a place, which values ethical practices and encourages overall development of a person.”

·         “I have always admired XYZ (company), for the cutting edge products and developments it bring about in the modern world. The impact of our work, is directly reflected among the society in general, which is a great feeling. I would like to be a part of this modern day game changer bandwagon. 

o    Note the clever & subtle use of “our” work instead of “your” work. You already seems to be a part of company.

·         “I believe, life is always a mix of hard work and fun. I find the work culture of xyz to carry the same principle. “Work hard... Party harder”. What better way to start off my career, than at a place, where I will feel like home.”

What is one thing that you like about our company?

Again, always know about the company before choosing your answer. A wrong line of answer could cost you the job itself. Like you go to a research Organization & tell about your partying habit, you most likely lose the chance to get through. Most likely one of the above answers applies here also. The difference is, you don’t have to align this with your interests & strengths.

What are your expectations from your first job?

You can always quote a simple vision or strategy which you like about the company. As a fresher, your most important expectation should be “To Learn” & this is what most companies expect from you. There could be additional personal expectation like contributing to society, placing yourself within corporate world, paying off your education loan etc;

Examples:

·         “I have had lot of studies during all these years, but mostly theoretical leanings. My first & foremost expectation from my first job would be to learn how all these are applied in a practical and industrial way. I also want to be a part of the corporate culture and learn how this is run.”

·         “I consider my first job as an extension of my studies only. More like a practical class. I want to learn a lot of new technologies, learn how the corporate world works, be part of a big energetic team and contribute to the projects, develop my soft skills and to prepare myself for tougher challenges in future.”

Do you have a referral in this company?

The question could be for two reasons

·         To understand, if you are familiar with the company culture. 

·         If you will be motivated enough to join the company, if given an offer.

·         If there is someone close to you, working in the company, or if there are many people you know as working here, there is a high probability, you will be a long term prospect for the company.

So, If you know anyone or many, working in the company, give the name, department & employee number. No need to tell any fake names or numbers, because in case of any verification, you might lose out a chance to make it. 

Note: Reach out to them & get this information before hand

General HR Questions

Was it difficult to find the location ?

Mostly an opening statement, to make you comfortable. Be calm & start chatting up about your experience. Such conversations will also help you cool your nerves before the interview.

Do you want to ask us anything 

MOST IMPORTANT QUESTION!! Never ever, go into an interview without preparing to ask any question. Always keep a question handy. This is your opportunity to voice any of your concern regarding the job profile, company profile, location, timing etc; if not already covered. If you really do not have any questions, ask some general questions like does company provide any higher education opportunity, does company encourage corporate social activities. Etc;

Suppose you win a huge money in jackpot, would you still work?

Few trick question like this might be thrown at you during HR interviews. These are not harmful or make-or-break your chances type of questions, however, it is wise to take such light hearted questions, in its light hearted manner (of course with a smile).

Example

·         “Depends on how much if left after my shopping”

·         “Never really thought about it... maybe, I will start a company then”.

·         “I always wanted to encourage entrepreneurship and motivate youth in job creation. I guess I might invest the money in some startups and still be working”

About any current news

·         If you are in the habit of reading news, don’t skip it for interview.

·         Keep yourself updated, especially on the fields of your expertise and stream of education.

Avoid

·         Shabby and casual dressing

·         Reaching late for interview

·         Lies and false facts

·         Stretching your answers beyond required time

·         Arguments or debates

·         Negative answers or criticisms