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Electrical Machines

Electrical Machines
Maximum power developed depends on

 voltage
 both 1and 2
 load angle
 reactance

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 OC and SC tests
 load test
 back to back test
None of these

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 both armature current Ia and speed ωm increase
 both decrese
 Ia increases and ωm decreses
 Ia remains constant but ωm increase

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Electrical Machines
Flux density under leading pole tips in case of generator will

 decrease
 either increase or decrease
 increase
None of these

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Ward-Leonard control.
 Multiple voltage control.
 Field control.
 Armature control.

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor resistance R
None of these
 both 1 and 2
 rotor reactance X

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MORE MCQ ON Electrical Machines

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