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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  1440 to 2880.
  375 to 500.
  500 to 720.
  720 to 920.

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Electrical Machines
The primary and secondary windings of a transformer are

  conductively linked.
  inductively linked.
 electrically linked.
 mechanically linked.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

 Resistance split phase motor
 Capacitor split phase motor
All of these
 Capacitor run motor

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Remain unchanged
 Increases.
 Decreases.
 None of above.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 83.33 KVA
 123.3 KVA
 100 KVA
 50 KVA

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

None of these
  magnetizing electric current and back emf.
  the supply voltage and the back emf.
  the rotating stator flux and rotor flux.

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