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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1820W
 2000W
 1920W
 1450W

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmax to Imax
 Vmax to Imin
 Vmin to Imin

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 18°
 30°
 60°
 20°

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

 0 V
 2 V
 1 V
 4 V

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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 net voltage across the armature resistance at the time of plugging will be

 240 V
 474 V
 6 V
 234 V

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 stray losses.
 core losses.
 dielectric losses.
 copper losses.

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