Electrical Machines If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated) remain the same as the original changes to three times the original value changes to 1.5 times the original value changes to 0.5 times the original value remain the same as the original changes to three times the original value changes to 1.5 times the original value changes to 0.5 times the original value ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Thin laminations are used in a machine in order to reduce Eddy current losses Hysteresis losses Both 1 and 2 Copper losses Eddy current losses Hysteresis losses Both 1 and 2 Copper losses ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In large sized DC machines the compensating windings are provided to compensate for the decrease in speed due to increase of load. neutralize voltage induced in coil due to fluctuation of l None of these reduce eddy current losses by providing local short circuits. compensate for the decrease in speed due to increase of load. neutralize voltage induced in coil due to fluctuation of l None of these reduce eddy current losses by providing local short circuits. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses? 0.5Kw 1.5KW 2KW 3KW 0.5Kw 1.5KW 2KW 3KW ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generators, electric current to the external circuit from armature is given through none of above. slip rings. commutator. solid connection. none of above. slip rings. commutator. solid connection. 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. None of these. To increase the flux cutting by the rotor. To absorb the mechanical shocks produced during running condition. To convert alternating supply current to direct current. None of these. To increase the flux cutting by the rotor. To absorb the mechanical shocks produced during running condition. ANSWER DOWNLOAD EXAMIANS APP
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