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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 350 V.
 420 V.
 480 V.
 400 V.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  under-compounded.
  differential compounded.
  over compounded.
  shunt.

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To absorb the mechanical shocks produced during running condition.
  To increase the flux cutting by the rotor.
  To convert alternating supply current to direct current.
  None of these.

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Electrical Machines
The type of DC motor used for shears and punches is

 Differential compound motor.
 Shunt motor.
 Series motor.
  Cummulative compound motor.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Reversing armature connection or field connection.
 Interchanging armature and field connection.
 Reversing supply connection.
 Adding resistance to field circuit.

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 27°C.
 35°C.
 32°C.
  45°C.

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