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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 Infinitely large.
 1000 ohms.
  Low.
 around 500 ohms.

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Electrical Machines
The frame of an induction motor is made of

  stainless steel.
  aluminium.
  closed grained cast iron.
  silicon steel.

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Electrical Machines
Dynamic braking is very effective for

 series motors.
 differential compound motors.
 shunt motors.
 separately excited motors.

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Electrical Machines
Wave winding is employed in DC machine of

 high current and low voltage rating.
 low current and low voltage rating.
 high current and low voltage rating.
  low current and high voltage rating.

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

 225 Ω.
 150 Ω.
 145 Ω.
  375 Ω.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1500 rpm
 3000 rpm
 750 rpm
 1000 rpm

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