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Electrical Machines

Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 low.
 positive.
 negative.
  zero.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

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

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Electrical Machines
The stator frame in an induction motor is used to

  provide return path for the flux.
  protect the whole machine.
  hold armature stamping in position.
  ventilate the armature.

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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

 2.56 %.
 4.76%.
 3.76%.
 2.57 %.

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 8+j13 ohms
 3.05+j5.08 ohms
 3.5+j5.8 ohms
 53+j85 ohms

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 None of these.
  Decrease.
 Increase.
 Remains same.

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