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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 10 - 20 W.
 250 - 500 W.
 200 - 250 W.
  50 - 150 W.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 2000 rpm
 250 rpm
 1000 rpm
 500 rpm

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Electrical Machines
For larger units high torque it is preferred to use

 DC shunt motor.
 Slip induction motor.
 Partial motor.
 Universal motor.

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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

  375 Ω.
 225 Ω.
 150 Ω.
 145 Ω.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 less and thin
 large and thin
 large and thick

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ √P.
 T2 ∝ P3.
 T is independent of P.
 T ∝ P.

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MORE MCQ ON Electrical Machines

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