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Electrical Machines

Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 2%
 25%
 5%
 4%

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Electrical Machines
Armature reaction depends on which of the following?

 magnitude of load current
 power factor of load
 both 1 and 2
None of these

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Electrical Machines
A DC compound motor has

 both shunt and series field winding.
 only series field winding.
 only shunt field winding.
 tertiary winding.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

 500 rpm.
 3000 rpm.
  600 rpm.
 3600 rpm.

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Electrical Machines
A DC generator can be considered as

 power pump.
 rectifier.
 rotating amplifier.
 prime mover.

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

 lagging
 unity
 zero
 leading

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