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Electrical Machines

Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 none of above.
 different.
 changes.
 same.

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Electrical Machines
Direction of rotation of DC motor is reversed by

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

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  AC slip ring IM.
  DC series motor.
  Capacitor type induction motors.
  Reluctance motor.

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Electrical Machines
Which type of motors are used for lathes?

 Either A or B.
 DC shunt motors.
 Cage induction motor.
 Synchronous motor.

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Electrical Machines
The commutator segments of DC machines are made up of

 brass
 copper
 hard-drawn copper
 copper alloy

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 mechanical loss
 copper loss
 both A and B

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