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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  zero.
  220 V.
  about 2 V.
  about 50 V.

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the polar axis.
 armature in the polar axis.
 armature midway between poles.
 commutator in the inter polar axis.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Operating speed.
 Starting torque, operating speed, full load current.
  Full load current.
 Starting torque.

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Electrical Machines
The speed regulation of a DC motor is given as

 NnL − NfL.
 (NfL − NnL)/NnL.
 NnL/NfL.
 (NnL − NfL)/NfL.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be less than 10%
 be 12.5%
 remain unchanged
 be more than 10%

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Hysteresis motor.
 Reluctance motor.
  Stepper motor.
 Shaded pole motor.

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