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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 leading
 unity
 zero
 lagging

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Armature current.
 Mechanical power.
 Induced emf.
 Can not be determined.

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Electrical Machines
What are slot wedges in a DC machine made of?

 Cast iron.
 Silicon steel.
 Fibre.
 Mild steel.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V, I/2 and P/2
 V/2, I/2 and P/4
 V/2, I and P/2
 V, I and P

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 25° to 30°
 0°
 70° to 85°

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 cogging.
 locking.
 plugging.
 crawling.

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