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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is
460 V
115 V
200 V
230 V
460 V
115 V
200 V
230 V
Answer
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Related Question
Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?
50, 1500.
60, 1440.
1440, 1500.
60, 1500.
50, 1500.
60, 1440.
1440, 1500.
60, 1500.
Answer
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Electrical Machines
For pure resistive load what is the armature reaction?
demagnetization
All of these
magnetization
cross magnetization
demagnetization
All of these
magnetization
cross magnetization
Answer
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Electrical Machines
Under commutation results in
no sparking.
sparking the trailing edge of the brush.
sparking at the leading edge of the brush.
sparking at the middle of the brush.
no sparking.
sparking the trailing edge of the brush.
sparking at the leading edge of the brush.
sparking at the middle of the brush.
Answer
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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?
2000.
0.
1000.
500.
2000.
0.
1000.
500.
Answer
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Electrical Machines
Which machine is used for battery charging?
None of these.
DC shunt generator.
DC series generator.
Compounded DC generator.
None of these.
DC shunt generator.
DC series generator.
Compounded DC generator.
Answer
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