Three Phase Induction Motor MCQ Question & Answer

September 2, 2022September 1, 2022 by Freshers Job Alert

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1. An induction motor works with

1. AC Only
2. DC Only
3. Both AC & DC
4. None of the Above

2. The stator core of a 3- phase induction motor is laminated in order to reduce the

1. Hysteresis loss
2. Eddy current loss
3. Both eddy current and hysteresis loss
4. Weight of the stator

3. The frame of an induction motor is usually made of

1. Silicon steel
2. Aluminum
3. Bronze
4. Cast iron

4. Slip rings are usually made of

1. Copper
2. Carbon
3. Aluminium
4. Phosphor bronze

5. The starting torque of a three-phase induction motor can be increased by

1. Increasing slip
2. Increasing current
3. Both (A) and (B)
4. None of the above

6. The induction motor shaft should be

1. Flexible
2. Hollow
3. Stiff
4. All of the above

7. Rotor rheostat control method of speed control is used for

1. Slip ring induction motors only
2. Squirrel-cage induction motors only
3. Both (A) and (B)
4. All of the Above

8. The induction motor shaft is made of

1. Stainless steel
2. High-speed steel
3. Cast iron
4. Carbon steel

9. In a 3-phase squirrel cage induction motor

1. Rotor conductors are short-circuited through end rings
2. Rotor conductor ends are short-circuited through slip rings
3. Rotor conductors are kept open
4. Rotor conductors are connected to the insulation

10. The rotor winding for a 3-phase slip ring induction motor having delta connected stator must be connected in

1. Star
2. Delta
3. None of the above
4. Delta or star according to need

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