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Electrical Machines

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  maximum.
  constant.
  minimum.

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  capacitor run.
  split phase.
  capacitor start.
  shaded pole type.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 0.87
 1.06
 0.95
 0.96

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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

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

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

All of these
 Insulation requirement is less.
 Operating cost is less.
 Collecting of large current is simple.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

  Series.
 None of the options.
 Compound.
 Parallel.

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MORE MCQ ON Electrical Machines

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