Electrical Machines DC series motor is best suited for electric traction as It runs at very high speed at light load. It develops high starting torque. It is cheaper in cost. It consume less power. It runs at very high speed at light load. It develops high starting torque. It is cheaper in cost. It consume less power. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The damper windings also called the squirrel cage windings or damper grids are provided on the stator for improving power factor. are provided in a synchronous motor to make it self starting. consists of short-circuited copper bars embedded in the field pole faces. both (A) and (B). are provided on the stator for improving power factor. are provided in a synchronous motor to make it self starting. consists of short-circuited copper bars embedded in the field pole faces. both (A) and (B). ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motor has more stability None of these cylindrical motor both motors has same stability salient pole motor None of these cylindrical motor both motors has same stability salient pole motor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Under operating conditions the rotor conductor should be _________________ in induction motor. none. always closed. always opened. semi closed or semi opened. none. always closed. always opened. semi closed or semi opened. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then Ph will increase but Pe will decrease Ph will decrease but Pe will remain same Pe will increase but Ph will decrease both hysteresis loss(Ph) and eddy current loss(Pe) will increase Ph will increase but Pe will decrease Ph will decrease but Pe will remain same Pe will increase but Ph will decrease both hysteresis loss(Ph) and eddy current loss(Pe) will increase ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because there was no residual magnetism in the field circuit field resistance was higher than critical resistance there was a break in the armature circuit field winding was wrongly connected there was no residual magnetism in the field circuit field resistance was higher than critical resistance there was a break in the armature circuit field winding was wrongly connected ANSWER DOWNLOAD EXAMIANS APP
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