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Electrical Machines

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
Stepper motor is used in

 food processing
 traction
All of these
 computer printers

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Electrical Machines
A single-winding single-phase motor has

  zero starting torque.
 starting torque equal to full-load torque.
 high starting torque.
 low starting torque.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 768 V
 384 V
 96 V
 192 V

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 half load
 any of the above
 no load
 full load

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = ωm
 ωe = 2/P*ωm
 ωe = P/2*ωm
 ωe = P*ωm

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