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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 not run.
 run at lower speed.
 run at normal speed.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 650 W
 625 W
 700 W

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

None of these
 not changed
 increase
 decrease

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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?

 150 V.
 240 V.
 230 V.
 210 V

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
  1.
 0.8.
 0.6.

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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 1, 2, 5
 3, 4, 5
 2, 4, 5, 6
 2, 3, 6

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