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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 10%
 5%
 19%
 40%

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use drum winding.
 reactance voltage produced due to communication.
  the use equalizer in lap winding.
 the use of compensating winding.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 45 ppm.
  35 ppm.
 25 ppm.
 20 ppm.

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Electrical Machines
Dynamic braking can be used for

All of these
 compound motors.
 series motors.
 shunt motors.

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Electrical Machines
Armature of DC machine is made of

 silicon steel.
 conducting material.
 non-ferrous material.
 insulating material.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 4575.4 r.p.m.
 1130 r.p.m.
 1037.5 r.p.m.
 none of above.

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