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EM 2

Authored by Shashank A

English

University

Used 1+ times

EM 2
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40 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A synchronous motor operates on the principle of

Lenz’s Law


b) Faraday’s Law


c) Magnetic locking between stator and rotor


d) Fleming’s Left-Hand Rule

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The rotor of a synchronous motor rotates at

Less than synchronous speed

More than synchronous speed

Exactly synchronous speed

Variable speed

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The rotor of a synchronous motor is generally made of

Aluminum

Silicon steel

Cast iron

Copper

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a difference between synchronous and induction motors?

Synchronous motors run at a fixed speed, while induction motors have slip

Synchronous motors require DC excitation, while induction motors do not

Induction motors operate at synchronous speed, while synchronous motors do not

Synchronous motors can operate at both lagging and leading power factors

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Compared to an induction motor, a synchronous motor is preferred when:

High starting torque is required

Variable speed operation is needed

Power factor correction is desired

Frequent starts and stops are required

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the load on a synchronous motor increases while excitation remains constant, the motor will:

Speed up

Slow down

Maintain synchronous speed but with increased torque

Stop immediately

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Increasing the excitation of a synchronous motor at a constant load will

Decrease the power factor

Improve the power factor leading

Have no effect on the power factor

Stop the motor

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