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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

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

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 460 A.
 340 A.
 570 A.
 250 A.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  720 to 920.
  1440 to 2880.
  500 to 720.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

All of these
 to avoid locking of the armature.
 to avoid over heating.
 to achieve a stronger magnetic field.

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Electrical Machines
Which of the following is the largest conversion device?

All of these
 Synchronous machine
 DC machine
 Induction machine

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 kept constant to certain value.
 decreased.
 remains same.
  increased.

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