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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 speed
 both A and B
 flux (φ)
 armature current (I)

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Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of crawling.
 increase starting torque.
 reduce chance of cogging.
  reduce magnetizing current.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 zero
 40 V
 50 V
 20 V

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Electrical Machines
In an ideal DC generator the regulation is

 low.
 zero.
 positive.
 high.

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increases the design cost
 increase the iron loss
All of these
 increase the maintenance and repair

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 6 V
 less than 6 V
 zero
 more than 6 V

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