
EM 2
Quiz
•
English
•
University
•
Practice Problem
•
Medium
Shashank A
Used 1+ times
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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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