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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up
more than 220 V
220 V
somewhat less than 220 V
6 V
more than 220 V
220 V
somewhat less than 220 V
6 V
Answer
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Regenerative braking is possible in
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DC shunt motor with field weakening control.
DC shunt motor with armature resistance control.
DC compound motor.
DC series motor.
DC shunt motor with field weakening control.
DC shunt motor with armature resistance control.
Answer
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Electrical Machines
In synchronous motor the torque is proportional to
Power P
1/P²
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Answer
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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?
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Answer
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Electrical Machines
In DC generators, the brushes remain in contact with conductors which
lie in the inter polar gaps.
lie under south pole.
lie under north pole.
there is no hard and fast rule for this.
lie in the inter polar gaps.
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lie under north pole.
there is no hard and fast rule for this.
Answer
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Electrical Machines
A smaller air gap in a polyphase induction motor helps to
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reduce the magnetizing current.
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increase the starting torque.
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Answer
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