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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is
250 A.
570 A.
340 A.
460 A.
250 A.
570 A.
340 A.
460 A.
Answer
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Related Question
Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to
under commutation.
over commutation.
any of the above.
too rapid reversal of current.
under commutation.
over commutation.
any of the above.
too rapid reversal of current.
Answer
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Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then
the machine with more drooping characteristic will supply more load.
the machine will share load equally.
the machine with more drooping characteristic will supply less load.
None of these
the machine with more drooping characteristic will supply more load.
the machine will share load equally.
the machine with more drooping characteristic will supply less load.
None of these
Answer
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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?
120P / N Hz.
PN / 2 Hz.
120 / PN Hz.
120N / P Hz.
120P / N Hz.
PN / 2 Hz.
120 / PN Hz.
120N / P Hz.
Answer
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Electrical Machines
Unbalance 3 - Φ stator currents cause
double frequency currents in the rotor.
vibrations.
heating of rotor.
All of these
double frequency currents in the rotor.
vibrations.
heating of rotor.
All of these
Answer
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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, 3, 4
1, 3, 5
2, 3, 4
1, 2, 5
1, 2, 3, 4
1, 3, 5
2, 3, 4
1, 2, 5
Answer
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