Three Phase Systems In Power Applications MCQ

Three Phase Systems In Power Applications MCQ

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  • 29th Aug, 2022

Three Phase Systems In Power Applications MCQ Questions

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Practice here the best Three Phase Systems In Power Applications MCQ Questions that checks your basic knowledge of Three Phase Systems In Power Applications. This Three Phase Systems In Power Applications MCQ Test contains 20+ Multiple Choice Questions. You have to select the right answer to the question. Apart from this, you can also download, Three Phase Systems In Power Applications MCQ PDF, completely free.

Three Phase Systems In Power Applications MCQ Test

1) As compared to three phase induction motor the advantage of synchronous Motor in addition to its constant speed is

  • A. Better efficiency
  • B.Higher Power factor
  • C.Both A & B
  • D.None of the above

2) In a balanced three-phase load, each phase.............

  • A. One-third of total power
  • B.Two-thirds of total power
  • C.A power consumption equal to (√3VL) IL
  • D.An equal amount of power

3) Choppers converter............

  • A. AC to AC
  • B.DC to DC
  • C.AC to DC
  • D.AC to DC

4) Three phase full converter will require ..................number of SCRs.

  • A. 2
  • B.3
  • C.6
  • D.9

5) In case of a three phase full controlled converter with 6 SCRs, commutation occurs every.............

  • A. 30°
  • B.60°
  • C.120°
  • D.180°

6) In a three phase AC circuit, the sum of all three generated voltages is.............

  • A. Zero
  • B.One
  • C.Infinite
  • D.None of the above

7) An induction motor is...........

  • A. Requires external supply
  • B.Self-starting
  • C.Both A and B
  • D.None of these

8) The power consumed by a three-phase load can be determined using the formula

  • A. P = √3 V I cos ø
  • B.P = 3 V I cos ø
  • C.P = √3 V I sin ø
  • D.P = √3 V I

9) The windings of a three-phase alternator are separated by.

  • A. 100º E
  • B.120º E
  • C.220º E
  • D.420º E

10) Three units of single phase transformers and one single three-phase transformer rating are

  • A. will be same for one rating
  • B.can never be made same
  • C.may be same
  • D.none of the mentioned

11) For a three-phase full controlled converter with R load, the average value of output voltage is zero for..............

  • A. α = 0°
  • B.α = 90°
  • C.α = 180°
  • D.α = 360°

12) The device which performs DC-AC conversion

  • A. Switch
  • B.Chopper
  • C.Inverter
  • D.Rectifier

13) Rotor induced EMF is nearly...............of maximum value

  • A. 5%
  • B.10%
  • C.15%
  • D.20%

14) In a three phase bridge rectifier circuit for HVDC transmission, the ratio of outout dc voltage to input ac voltage is

  • A. 2
  • B.0.5
  • C.1.0
  • D.1.71

15) Rotor induced EMF is nearly..............of maximum value

  • A. 5%
  • B.10%
  • C.15%
  • D.20%

16) In a three phase voltage source inverter operating in square wave mode, the output line voltage is free from

  • A. 3rd harmonic
  • B.13th harmonic
  • C.7th harmonic
  • D.11th harmonic

17) A three phase full coverter is supplying a purely resistive load at 300 V dc for 0° firing angle. The output voltage for 90° firing angle would be

  • A. 100 V
  • B.0 V
  • C.40 V
  • D.50 V

18) Resultant flux of 3 phase induction motor is.

  • A. 2 φm
  • B.3 φm
  • C.(3/2)φm
  • D.(√3/2)φm

19) Syncronous speed of a 3 phase, 4 pole, 50Hz induction motor is.

  • A. 1440 rpm
  • B.1500 rpm
  • C.2880 rpm
  • D.3000 rpm

20) What is the magnitude of each line current in a Y-connected circuit?

  • A. One-third the phase current
  • B.Three times the corresponding phase current
  • C.Equal to the corresponding phase current
  • D.Zero

21) The most common type of ac motor is the _______.

  • A. Single-phase induction motor
  • B.Two-phase induction motor
  • C.Two-phase squirrel-cage motor
  • D.Three-phase induction motor

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