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AC 3 PHASE INDUCTION MOTOR
Set 1
Set 1
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Q13436
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What is the speed of rotating magnetic field in a 3f induction motor?
A
Rotor speed
B
Synchronous speed
C
Motor speed
D
Rated speed
Q13437
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What is the synchronosis speed of a 3 phase induction motor if the supply frequency is 50 Hz and number of pole is 4?
A
1400 rpm
B
1500 rpm
C
1450 rpm
D
1000 rpm
Q13438
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Which material is used to wound rotor of squirrel cage induction motor?
A
Aluminium
B
Enamelled copper conductor
C
Silicon steel
D
Copper bars
Q13439
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Which part of squirrel cage rotor is short circuited?
A
End rings
B
Shaft
C
End cover hysteresis
D
Bearings
Q13440
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Why the core of 3f induction motor is laminated?
A
To reduce friction loss
B
To reduce eddy current loss
C
To reduce hysterism loss
D
To reduce starting current
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