Electrical Machines When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a induction motor. variable reluctance motor. switched reluctance motor. DC motor. induction motor. variable reluctance motor. switched reluctance motor. DC motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A simple method of increasing the voltage of a DC generator is to increase the speed of shaft rotation. increase the number of turns in armature coil. increase the number of turns in field coil. increase the source frequency. increase the speed of shaft rotation. increase the number of turns in armature coil. increase the number of turns in field coil. increase the source frequency. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms. 0.512. 0.443. 0.649. 0.573. 0.512. 0.443. 0.649. 0.573. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by fixing the brush axis inline with the pole axis. shifting the brush axis from GNA to MNA. increasing field excitation. compensating winding and commutating poles. fixing the brush axis inline with the pole axis. shifting the brush axis from GNA to MNA. increasing field excitation. compensating winding and commutating poles. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motors has negative speed regulation? Shunt motors. Differential compound motors. Series motors. Both B and C. Shunt motors. Differential compound motors. Series motors. Both B and C. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Addition of 0.3 % to 4.5 % silicon to iron increases the hysteresis loss. increases the electrical resistivity of iron. None of these reduces the saturation magnetization. increases the hysteresis loss. increases the electrical resistivity of iron. None of these reduces the saturation magnetization. ANSWER DOWNLOAD EXAMIANS APP
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