Electrical Machines The back emf produced in a dc motor depends on Z. none of these. P. P and Z. Z. none of these. P. P and Z. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Conservator tank is used for better cooling of transformer. to take up the expansion of oil due to temperature rise. to act as an oil storage. None of these for better cooling of transformer. to take up the expansion of oil due to temperature rise. to act as an oil storage. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When excitation is increased (over excitation), the synchronous generator operates at leading power factor. unity power factor. any of the above. lagging power factor. leading power factor. unity power factor. any of the above. lagging power factor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the necessity of copper brushes in a dc motors? To convert alternating supply current to direct current. To increase the flux cutting by the rotor. None of these. To absorb the mechanical shocks produced during running condition. To convert alternating supply current to direct current. To increase the flux cutting by the rotor. None of these. To absorb the mechanical shocks produced during running condition. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm? -3% +3% -3.33% +3.33% -3% +3% -3.33% +3.33% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In an alternator the voltage generated per phase is proportional to number of turns in coil. frequency of waveform. All of these flux per pole. number of turns in coil. frequency of waveform. All of these flux per pole. ANSWER DOWNLOAD EXAMIANS APP
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