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Electrical Machines
Dynamic braking is very effective for
separately excited motors.
differential compound motors.
series motors.
shunt motors.
separately excited motors.
differential compound motors.
series motors.
shunt motors.
Answer
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Related Question
Electrical Machines
Example of double excited machine is
DC Shunt Motor
Synchronous motor.
Both are correct.
None of these
DC Shunt Motor
Synchronous motor.
Both are correct.
None of these
Answer
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Electrical Machines
Skewing of cage rotors offers the following advantages
uniform torque.
locking tendency is reduced.
less noise.
all of below.
uniform torque.
locking tendency is reduced.
less noise.
all of below.
Answer
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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have
smoother acceleration.
more starting time.
more starting torque.
reduced starting current.
smoother acceleration.
more starting time.
more starting torque.
reduced starting current.
Answer
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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because
the motor may run away.
the motor may not start.
the starting current will be enormously high.
the starting torque becomes low.
the motor may run away.
the motor may not start.
the starting current will be enormously high.
the starting torque becomes low.
Answer
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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is
3000 rpm
1500 rpm
750 rpm
1000 rpm
3000 rpm
1500 rpm
750 rpm
1000 rpm
Answer
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