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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is
shunt.
differential compound.
cumulative compound.
series.
shunt.
differential compound.
cumulative compound.
series.
Answer
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Related Question
Electrical Machines
The core flux in transformer depends mainly on
supply voltage
supply voltage and load
supply voltage, frequency and load
supply voltage and frequency
supply voltage
supply voltage and load
supply voltage, frequency and load
supply voltage and frequency
Answer
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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is
synchronous motor.
synchronous generator.
asynchronous generator.
asynchronous motor.
synchronous motor.
synchronous generator.
asynchronous generator.
asynchronous motor.
Answer
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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will
Reduce by 5%.
Increase by 5%.
Depends on other factor.
Remain unchanged.
Reduce by 5%.
Increase by 5%.
Depends on other factor.
Remain unchanged.
Answer
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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be
15.28 Nm
16.55 Nm
15.6 Nm
15.92 Nm
15.28 Nm
16.55 Nm
15.6 Nm
15.92 Nm
Answer
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Electrical Machines
The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is
1, 3
2, 3
1, 4
2, 4
1, 3
2, 3
1, 4
2, 4
Answer
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