Electrical Machines Eb/Vt ratio of a DC motor is an indication of efficiency. starting torque. running torque. speed regulation. efficiency. starting torque. running torque. speed regulation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be B - C - A or C - A - B. B - C - A. A - C - B. C - A - B. B - C - A or C - A - B. B - C - A. A - C - B. C - A - B. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be increased by 10% reduced by 20% increased by 20% reduced by 10% increased by 10% reduced by 20% increased by 20% reduced by 10% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm? 24 10 12 5 24 10 12 5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be 250 V. zero. about 100 V. very small, say about 2 or 3 V. 250 V. zero. about 100 V. very small, say about 2 or 3 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For high current and low voltage rating which winding is employed to DC machine? Lap winding. Both wave and lap winding. Wave winding. No wave and lap winding. Lap winding. Both wave and lap winding. Wave winding. No wave and lap winding. ANSWER DOWNLOAD EXAMIANS APP
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