Polyphase Induction Motors MCQ

Polyphase Induction Motors MCQ

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  • 30th Mar, 2022

Polyphase Induction Motors MCQ Questions

Take Polyphase Induction Motors MCQ Test & Online Quiz to test your Knowledge

Below is the Polyphase Induction Motors MCQ test that checks your basic knowledge of Polyphase Induction Motors. This Polyphase Induction Motors MCQ Test contains 20 Multiple Choice Questions. You have to select the right answer to the question. apart from this you can also download here Polyphase Induction Motors MCQ PDF completly free.

Polyphase Induction Motors MCQ Test

1) In polyphase induction motors, the stator contains multiple distinct windings per motor pole driven by corresponding time-shifted sine waves.

  • A. True
  • B.False

2) The frame of an induction motor is usually made of ___.

  • A. Silicon steel
  • B.Cast iron
  • C.Aluminum
  • D.Bronze

3) The shaft of an induction motor is made of ___.

  • A. Stainless steel
  • B.Carbon steel
  • C.Cast iron
  • D.Aluminum

4) A double squirrel-cage induction motor has __.

  • A. two series winding in stator
  • B.two parallel windings in stator
  • C.two parallel winding in Rotor
  • D.two rotors moving in opposite direction

5) Is the starting torque of a squirrel-cage induction motor is Low?

  • A. Yes
  • B.No

6) Which material is used to made Slip ring of an induction motor?

  • A. Phosphorus Bronze
  • B.Aluminum
  • C.Copper
  • D.Carbon

7) The shaft of an induction motor must be of __.

  • A. solid
  • B.hollow
  • C.flexible
  • D.None of the above

8) Which is of the following data is required to draw the circle diagram for an induction motor?

  • A. Block rotor test only
  • B.No load test only
  • C.Block rotor test and no-load test
  • D.Block rotor test, no-load test and stator resistance test

9) Which of the following component is usually fabricated out of silicon steel?

  • A. Bearings
  • B.Stator core
  • C.Shaft
  • D.None of the above

10) Rotor rheostat control method of speed control is used for __.

  • A. Squirrel-cage induction motors only
  • B.Slip ring induction motors only
  • C.Both (A) and (B)
  • D.None of the above

11) Which of the following is associated with the term cogging?

  • A. Three-phase transformer
  • B.Compound Generator
  • C.Induction motor
  • D.D.C series motor

12) Maximum running torque occurs when ___.

  • A. S = R/X or R = S ∗ X
  • B.S = RX or R = S/.X
  • C.S = R2/X
  • D.None of the above

13) In which of the following reason induction motor operation is stable?

  • A. Low Slip region
  • B.High slip region
  • C.equally region
  • D.None of the above

14) An induction motor is analogous to

  • A. Two windings transformer with secondary short circuited
  • B.Auto-transformer
  • C.Two windings transformer with secondary open circuited
  • D.Synchronous motor

15) Blocked rotor test in an induction motor is used to determine:

  • A. Leakage impedance
  • B.Copper loss
  • C.Both A and B
  • D.None of the above

16) A small air gap in 3 phase induction motor helps to reduce Magnetizing effect.

  • A. True
  • B.False

17) What is the shape of the torque/slip curve of induction motor?

  • A. Parabola
  • B.Hyperbola
  • C.Rectangular parabola
  • D.Straight line

18) Auto transformer method of starting has most acceptable method for the starting of the induction motor due to ___.

  • A. maximum torque
  • B.maximum reduction of inrush current
  • C.variable tapping
  • D.All of the mentioned

19) Which of the following leads to the phenomenon 'crawling'?

  • A. squirrel cage induction motors exhibit a tendency to run at very slow speeds
  • B.squirrel cage induction motors exhibit a tendency to run at very fast speeds
  • C.squirrel cage induction motors exhibit a tendency to run at equal speeds
  • D.None of the above

20) Which of the following is used as a lubricant for rolling bearings?

  • A. Graphite
  • B.lithium-based grease
  • C.Silicon
  • D.None of the above

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