This document contains multiple choice questions and answers about special electrical machines for competitive exam preparation. It is provided by Test Shopping Innovative e-Learning Org and covers topics about synchronous reluctance motors, Vernier motors, stepper motors, switched reluctance motors, brushless DC motors, and brushless permanent magnet motors. The questions test understanding of key characteristics, operating principles, and constraints of various special electric machines.

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Objective Questions
Presented By
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2. Objective Question – Special Electrical Machine:
Synchronous Reluctance Motor does not have _____________.
1. Stator winding
2. Rotor winding
3. Field winding
4. All of the above
Answer: 3
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3. Answer: 1
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Objective Question – Special Electrical Machine:
In Vernier motor the rotating field rotates 90 degrees, the rotor
will rotate _____________ of its slot pitch
1. One half
2. Two half
3. Rotate 90 degree
4. Quater half

4. Answer: 4
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Objective Question – Special Electrical Machine:
Stepper motor Input and output will be in form of
_____________and ____________.
1. Analog and digital
2. Digital and Analog
3. Digital and continuous angular rotation
4. Digital and Discrete angular rotation

5. Answer: 2
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Objective Question – Special Electrical Machine:
In stepper motor __________ and__________ should be same.
1. Stator pole and Rotor pole
2. Stator teeth and Rotor teeth
3. Stator pole and Rotor teeth
4. Stator teeth and Rotor pole

6. Answer: 2
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Objective Question – Special Electrical Machine:
In stepper motor torque suddenly goes to low value, to overcome this
principle is used called__________.
1. Macro stepping
2. Micro stepping
3. Macro Boosting
4. Micro Boosting

7. Answer: 1
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Objective Question – Special Electrical Machine:
In SRM, when duty cycle reaches_________ percent the speed can be
increased by increasing the conduction period.
1. 100
2. 95
3. 70
4. 85

8. Answer: 2
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Objective Question – Special Electrical Machine:
In BLDC motor the third ring in-between rotor ring and
stationary ring called.
1. EMF Ring
2. MMF Ring
3. Stator Ring
4. Rotor Ring

9. Answer: 4
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Objective Question – Special Electrical Machine:
Which of the following are the advantages of BLPM Motor?
1. One transistor and one position sensor is sufficient.
2. Inertia should be such that the rotor rotates continuously
3. Utilization of transistor and winding are less than 50%.
4. All the above

10. Answer: 4
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Objective Question – Special Electrical Machine:
The constraints of BLPM motor is.
1. The continues current should not exceed the permissible
current limit and Torques should not exceed.
2. The maximum permissible supply voltage
3. The speed should exceed
4. Both A and B

11. Answer: 3
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Objective Question – Special Electrical Machine:
In practical scenario, is it possible to run the Special machine in
single quadrant rather than using all four quadrant?
1. Depending upon situation
2. Depending upon the slope of area
3. Not possible
4. Any of above

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