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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

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

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/4S
 PZL/4SP²
 PZL/ 4Sa
 PZL/4Sa²

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V²
 f²
 V
 f

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Electrical Machines
The power developed by salient pole synchronous machine is/are

 power due to saliency or reluctance only
 excitation power only
 both 1 and 2
None of these

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Electrical Machines
Damper winding is used to

 increase the load current.
 both 1 and 2.
 suppress the hunting.
 decrease the load current.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 decrease.
 increase.
None of these
 either of these.

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