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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 400 A.
 44 A.
  40 A.
 440 A.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1820W
 1920W
 2000W
 1450W

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

 18.25%.
 14.28%.
  16.67%.
 15.30%.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K×R1
 R1 /K²
 K²R1
 R1 /K

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Electrical Machines
In double cage induction motor, the outer cage offers

  low resistance and high reactance.
  high resistance and low reactance.
  high resistance and high reactance.
  low resistance and low reactance.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  over compounded.
  under-compounded.
  differential compounded.
  shunt.

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