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Electrical Machines
In field flux method speed control of DC Motor is
constant hp drive below the base speed.
constant torque drive below the base speed.
constant torque drive above the base speed.
constant power drive above base speed.
constant hp drive below the base speed.
constant torque drive below the base speed.
constant torque drive above the base speed.
constant power drive above base speed.
Answer
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Related Question
Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is
1, 2, 5
1, 3, 5
2, 3, 4
1, 2, 3, 4
1, 2, 5
1, 3, 5
2, 3, 4
1, 2, 3, 4
Answer
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Electrical Machines
Hunting in a synchronous motor takes place
motor is under loaded.
when load varies.
when power factor is unity.
when supply voltage fluctuates.
motor is under loaded.
when load varies.
when power factor is unity.
when supply voltage fluctuates.
Answer
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Electrical Machines
The current drawn by a DC motor at the time of starting is
Zero.
Normal.
Very low.
Very high.
Zero.
Normal.
Very low.
Very high.
Answer
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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing
open circuit and zero power factor tests.
zero power factor and slip tests.
open circuit and short circuit tests.
short circuit and slip tests.
open circuit and zero power factor tests.
zero power factor and slip tests.
open circuit and short circuit tests.
short circuit and slip tests.
Answer
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Electrical Machines
The back emf produced in a dc motor depends on
P and Z.
none of these.
Z.
P.
P and Z.
none of these.
Z.
P.
Answer
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