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Electrical Machines
A simple method of increasing the voltage of a DC generator is to
increase the source frequency.
increase the speed of shaft rotation.
increase the number of turns in armature coil.
increase the number of turns in field coil.
increase the source frequency.
increase the speed of shaft rotation.
increase the number of turns in armature coil.
increase the number of turns in field coil.
Answer
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Related Question
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Synchronous reactance of an alternator represents
field winding reactance
All of these
a reactance operating at synchronous speed
armature reactance and leakage reactance
field winding reactance
All of these
a reactance operating at synchronous speed
armature reactance and leakage reactance
Answer
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Electrical Machines
The starting resistance of DC motor is generally
Infinitely large.
Low.
around 500 ohms.
1000 ohms.
Infinitely large.
Low.
around 500 ohms.
1000 ohms.
Answer
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Electrical Machines
Series booster is a
series wound DC generator.
shunt wound DC generator.
separately excited DC generator.
permanent magnet DC generator.
series wound DC generator.
shunt wound DC generator.
separately excited DC generator.
permanent magnet DC generator.
Answer
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Electrical Machines
Hysteresis loss is proportional to
f1.5.
f2.
f3.
f.
f1.5.
f2.
f3.
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Answer
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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects
neither the voltage nor the torque
voltage but not the torque
both the torque and voltage
torque but not the voltage
neither the voltage nor the torque
voltage but not the torque
both the torque and voltage
torque but not the voltage
Answer
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