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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
 GNA
 either GNA or MNA
None of these

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Electrical Machines
Which of the following motor is used in grinders?

  Synchronous motor.
  Capacitor start capacitor run IM.
  Capacitor start IM.
  Split phase IM.

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Electrical Machines
Which type of motors are preferred in lifts?

 DC shunt motors.
 DC compound motors.
None of these
 DC series motors.

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve efficiency.
  reduce copper loss.
  improve power factor.
  improve starting torque.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 940 rpm
 975 rpm
 950 rpm
 1000 rpm

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Electrical Machines
The output voltage of a DC generator is

 E = V + Ra.
 E = V – IaRa.
 E = V + Ia.
  E = V + IaRa.

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