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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 speed.
 torque.
 power.

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Electrical Machines
Hunting phenomenon is observed in which motor?

 Both A and C.
  Synchronous motor.
 DC motor.
 Induction motor.

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

 Fibre.
 Silicon steel.
 Cast iron.
 Mild steel.

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 541.67V, 200 rpm.
 541.67V, 250 rpm.
 2166.67V, 230 rpm.
 2166.67V, 270 rpm.

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 26.21 kW.
 23.06 kW.
 24.11 kW.
 25 kW.

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

 4.
 7.
 3.
  12.

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