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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

 Lathes.
 Centrifugal pumps
 Blowers and fans.
  All of this.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

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

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 decrease and increase respectively
 both decrease
 increase and decrease respectively
 both increase

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very low speed.
 run at very high speed.
 burn.
 start haunting.

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1000
 1080
 1203
 1200

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Electrical Machines
Ward Leonard control is provides speed control

  In both direction.
  Below rated speed.
  Above rated speed.
  In one direction only.

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MORE MCQ ON Electrical Machines

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