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UPPCL EE :Electrical Machines Quiz 5

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Question 1

Which of the following are the advantages of using a stepper motor?

Question 2

Consider the following statements regarding shaded-pole motor :

1. High starting torque

2. Extremely rugged

3. Very little overload capacity

4. Efficiency very low nearly 5% to 30%

Which of the above statements is correct?

Question 3

In which of the following respects, the servomotors differ in application capabilities from large industrial motors?

1) They produce high torque at all speeds including zero speed.

2) They are capable of holding a static position.

3) They do not overheat at standstill or lower speeds.

4. Due to low-inertial they are not able to reverse direction quickly.

Question 4

Which of the following statements are correct for reluctance motor.

1. These are induction start and synchronous run motors.

2. These have dc field winding.

3. Cogging does not occur in reluctance motor.

Question 5

In stepper motor, micro stepping results in:

Question 6

Linear induction motor is used in:

Question 7

A stepper motor has 4 main poles have been castellated to have 10 teeth each if the rotor has 50 teeth calculate the stepping angle –

Question 8

Match List-I with List-II and select the correct answer using the code given below the lists:
List-I
A) General purpose split phase FHP motor
B) General purpose capacitor start FHP motor
C) Permanent split capacitor start FHP motor
D) Shaded pole FHP motor
List-II
1) Refrigerators
2) Hair dryers
3) Unit heaters
4) Fans, blowers

Question 9

The main purpose of permanent magnet motors are

Question 10

Which is not true for hysteresis motor?

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