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Electrical Machines
Which of the following rotor requires damper winding?
Cylindrical rotor.
None of these
Salient pole rotor.
Both type rotor.
Cylindrical rotor.
None of these
Salient pole rotor.
Both type rotor.
Answer
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Related Question
Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be
B - C - A or C - A - B.
C - A - B.
A - C - B.
B - C - A.
B - C - A or C - A - B.
C - A - B.
A - C - B.
B - C - A.
Answer
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Electrical Machines
It is advisable to start a DC series motor with some load to
Limit the flux.
Avoid sparking.
Limit the speed.
Limit the current.
Limit the flux.
Avoid sparking.
Limit the speed.
Limit the current.
Answer
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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.
P = 50, s = 4.43 %.
P = 20, s = 3.33 %.
P = 40, s = 5.79 %.
P = 60, s = 0.96 %.
P = 50, s = 4.43 %.
P = 20, s = 3.33 %.
P = 40, s = 5.79 %.
P = 60, s = 0.96 %.
Answer
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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as
DC series motor.
DC shunt motor.
DC series generator.
DC shunt generator.
DC series motor.
DC shunt motor.
DC series generator.
DC shunt generator.
Answer
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Electrical Machines
The crawling in the induction motor is caused by
high loads
improper design of stator laminations
low voltage supply
harmonics developed in the motor
high loads
improper design of stator laminations
low voltage supply
harmonics developed in the motor
Answer
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