Test
Authored by RadhaGovinda Jena
Physics
Vocational training
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which part of a three-phase induction motor is stationary?
Rotor
Stator
Shaft
Commutator
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The rotating magnetic field in an induction motor is produced by:
Rotor current
DC excitation
Stator currents
External magnets
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The rotor of an induction motor always rotates:
At synchronous speed
Faster than synchronous speed
Slower than synchronous speed
In reverse direction
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Slip in an induction motor is defined as:
Synchronous speed / Rotor speed
Rotor speed / Synchronous speed
(Ns - Nr) / Ns
(Nr - Ns) / Nr
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Synchronous speed of a 4-pole motor running at 50 Hz is:
750 RPM
1000 RPM
1500 RPM
3000RPM
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which type of rotor is used in a squirrel cage induction motor?
Cylindrical rotor
Slip ring rotor
Laminated rotor
Short-circuited rotor bars
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The rotor frequency in a 3-phase induction motor is equal to:
Supply frequency
Slip × Supply frequency
Rotor speed × Poles
Constant
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