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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

 lubrication.
  both cooling and insulation.
 cooling.
  insulating.

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

 hysteresis loss.
 eddy current loss.
  copper losses.
 core loses only.

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 2.57 %.
 3.76%.
 4.76%.
 2.56 %.

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 Zero
 15.6 Nm
 16.55 Nm
 15.28 Nm

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

 0.70 Hz.
  0.65 Hz.
  60 Hz.
 0.75 Hz.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

 both eddy current and hysteresis loss.
 eddy current loss.
  hysteresis loss.
 ohmic loss.

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines

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