Electrical Machines Which of the following DC motors has got maximum relieving property? Series. Shunt. Cummulative compound. Differentical compound. Series. Shunt. Cummulative compound. Differentical compound. ANSWER DOWNLOAD EXAMIANS APP
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 31.9 Ω 31.1 Ω 15.9 Ω 15.1 Ω 31.9 Ω 31.1 Ω 15.9 Ω 15.1 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the excitation is reduced, the power factor is unity power factor None of these leading power factor lagging power factor unity power factor None of these leading power factor lagging power factor 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 20% increased by 10% reduced by 20% reduced by 10% increased by 20% increased by 10% reduced by 20% reduced by 10% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease? 19% 40% 5% 10% 19% 40% 5% 10% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Where the shunt generators are widely used? Where a constant voltage is required over a narrow load range. Where voltage variation is needed over a wide load range. Where often load fluctuation is occurred. Where the load is very high. Where a constant voltage is required over a narrow load range. Where voltage variation is needed over a wide load range. Where often load fluctuation is occurred. Where the load is very high. ANSWER DOWNLOAD EXAMIANS APP
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