Electrical Engineering MCQ on Induction Motor Part 27
Contents
- 1 Starting winding of a single-phase motor of a refrigerator is disconnected from the circuit by using
- 2 The maximum torque in repulsion motor is developed when
- 3 Hysteresis motor is predominantly useful in case of high-quality record players and tape-recorders because
- 4 As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered an appropriate choice for
- 5 The watt rating for a ceiling fan motor will be in the range
Starting winding of a single-phase motor of a refrigerator is disconnected from the circuit by using
Starting winding of a single-phase motor of a refrigerator is disconnected from the circuit by using
- Centrifugal switch
- Magnetic relay
- Thermal relay
- None of these
Correct answer: 2. Magnetic relay
The maximum torque in repulsion motor is developed when
The maximum torque in repulsion motor is developed when
- Brush axis coincides with the field axis
- Brush axis is at 45° electrical to the field axis
- Brush axis is at 90° electrical to the field axis
- None of these
Correct answer: 2. Brush axis is at 45° electrical to the field axis
Hysteresis motor is predominantly useful in case of high-quality record players and tape-recorders because
Hysteresis motor is predominantly useful in case of high-quality record players and tape-recorders because
- It can be easily manufactured in extremely small sizes of up to 1 w output
- It develops hysteresis torque which is extremely steady both in amplitude and phase
- It is not subject to any magnetic or mechanical vibrations
- It revolves synchronously
Correct answer: 2. It develops hysteresis torque which is extremely steady both in amplitude and phase
As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered an appropriate choice for
As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered an appropriate choice for
- Blowers
- Fans
- Mixer grinders
- Sound equipment
Correct answer: 4. Sound equipment
The watt rating for a ceiling fan motor will be in the range
The watt rating for a ceiling fan motor will be in the range
- 10 to 20 W
- 200 to 250 W
- 250 to 500 W
- 50 to 150 W
Correct answer: 4. 50 to 150 W