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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 flux (φ)
 armature current (I)
 speed
 both A and B

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3600 rpm.
  600 rpm.
  3000 rpm.
  500 rpm.

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 equal to that of second transformer.
 less than that of second transformer.
 none of these.
  more than that of second transformer.

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 open fuse or circuit breaker.
 draw too much current.
 produce sparking at brushes.
 develop excessive speed and damage itself.

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Electrical Machines
When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

 variable reluctance motor.
 switched reluctance motor.
 DC motor.
 induction 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.
 150 Ω.
 225 Ω.
 145 Ω.

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