Electrical Machines As compared to an induction motor, the air gap in a DC motor is between 50% and 90%. more. same. less than 50%. between 50% and 90%. more. same. less than 50%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC generator without commutator is a DC generator induction motor AC generator DC motor DC generator induction motor AC generator DC motor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In travelling cranes for hoisting and lowering which type of motor is preferred? Synchronous motor. AC slip ring motor. Single phase induction motor. DC series motor. Synchronous motor. AC slip ring motor. Single phase induction motor. DC series motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce hysteresis loss. vibrations. copper loss. eddy electric current loss. hysteresis loss. vibrations. copper loss. eddy electric current loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The mmf produced by rotor currents of a 3 - Φ induction motor rotates at synchronous speed with respect to rotor. rotates at the speed of rotor in the air gap. is at standstill with respect to stator mmf. rotates at slip speed with respect to stator mmf. rotates at synchronous speed with respect to rotor. rotates at the speed of rotor in the air gap. is at standstill with respect to stator mmf. rotates at slip speed with respect to stator mmf. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to less than one. greater than one. approx to one. very low less than one. greater than one. approx to one. very low ANSWER DOWNLOAD EXAMIANS APP
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