NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Electronics MCQs (Practice_Test 5 of 13)
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- The crawling in an induction motor is caused by
- improper design of the machine
- low voltage supply
- high loads
- harmonics developed in the motor
- Answer: d
- The speed of an induction motor
- decreases too much with the increase of load
- increase with the increase of load
- decreases slightly with the increase of load
- remains constant with the increase of load
- Answer: c
- The effect of increasing the length of the air gap in an induction motor will increase
- power factor
- speed
- magnetising current
- air-gap flux
- Answer: c
- the difference between the synchronous speed and the actual speed of an induction motor is known as
- Regulation
- back lash
- slip
- lag
- Answer: c
- Rotating magnetic field is produced in a
- single-phase induction motor
- three phase induction motor
- dc series motor
- ac series motor
- Answer: b
- The stator core of the induction motor is made of
- Laminated cast iron
- Mild steel
- Silicon steel stampings
- Soft wood
- Answer: c
- Star-delta starter of an induction motor
- Inserts resistance in rotor circuit
- Inserts resistance in stator circuit
- Applies reduced voltage to rotor
- Applies reduced voltage to stator
- Answer: d
- The starting torque of a 1-phase induction motor is
- High
- Medium
- Low
- Zero
- Answer: d
- The thrust developed by a linear induction motor depends on
- Synchronous speed
- Rotor input
- Number of poles
- both A and B
- Answer: d
- A 3-phase squirrel cage induction motor supplied from a balanced 3-phase source drives a mechanical load.
- The torque-speed characteristics of the motor (solid curve) and of the load (dotted curve) are shown. Of the two equilibrium points A and B, which of the following options correctly describes the stability of A and B? [GATE 2009]
- A is stable B is unstable
- A is unstable B is stable
- Both are stable
- Both are unstable
- Answer: b
- The torque-speed characteristics of the motor (solid curve) and of the load (dotted curve) are shown. Of the two equilibrium points A and B, which of the following options correctly describes the stability of A and B? [GATE 2009]