Electrical Machines For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to 420 V. 400 V. 480 V. 350 V. 420 V. 400 V. 480 V. 350 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of following DC motors will have percentage increase of input current for the same percentage increase in torque? Shunt. Differntical compound. Series. Cummulative compound. Shunt. Differntical compound. Series. Cummulative compound. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is 375 Ω. 225 Ω. 145 Ω. 150 Ω. 375 Ω. 225 Ω. 145 Ω. 150 Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by compensating winding and commutating poles. fixing the brush axis inline with the pole axis. increasing field excitation. shifting the brush axis from GNA to MNA. compensating winding and commutating poles. fixing the brush axis inline with the pole axis. increasing field excitation. shifting the brush axis from GNA to MNA. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In shapers and slotters which motor are preferred? Slip ring IM. Double cage motor. Synchronous motor. Squirrel cage IM. Slip ring IM. Double cage motor. Synchronous motor. Squirrel cage IM. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as 2 to 3. 1.5 to 2. 3 to 5. 1.0. 2 to 3. 1.5 to 2. 3 to 5. 1.0. ANSWER DOWNLOAD EXAMIANS APP
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