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Electrical Machines

Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 0o.
 Greater than 90o.
 90o.
 less than 90o.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 zero.
 normal speed.
 more than normal speed.
 less than normal speed.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 increase
 decrease
 not changed
None of these

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply voltage
 rotor resistance
 supply frequency
None of these

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 60
 600
 660
 40

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  DC differential compound motor.
  Synchronous motor.
  Stepper motor.
  Slip ring induction motor.

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