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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 2 V
 4 V
 0 V

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Electrical Machines
Lamination of core are generally made of

 stainless steel.
 cast iron.
 carbon.
 silicon steel.

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

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

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Electrical Machines
Wave winding is prefered for which of the following rating?

 high current and high voltage
 low current and high voltage
 low current and low voltage
 high current and low voltage

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.9 Ω
 31.9 Ω
 15.1 Ω
 31.1 Ω

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1200
 1080
 1000
 1203

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