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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 19%
 40%
 5%
 10%

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 31.9 Ω
 15.1 Ω
 31.1 Ω
 15.9 Ω

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 No load.
  Full load.
 None of these.
 Low load.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  speed can not be increased.
  decreasing of frequency.
  increasing of frequency.
  increasing number of poles.

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V
 f
 f2
 V2

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Electrical Machines
The induction motor shaft is made of

  stainless steel.
  cast iron.
  aluminium.
  mild steel.

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