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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Cast iron.
 Silicon steel.
 Fibre.
 Mild steel.

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

  a large starting torque.
 higher efficiency.
 reduced starting torque.
 low noise.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 234 V
 6 V
 240 V
 474 V

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 AC single phase motor.
 Induction motor.
 DC Shunt Motor
 Synchronous motor.

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 full load
 any of the above
 no load
 half load

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Electrical Machines
At slip s = 1 torque developed in machine is

  starting torque.
  none.
  maximum torque.
  electromagnetic torque.

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