Electrical Machines What is the necessity of copper brushes in a dc motors? 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. To convert alternating supply current to direct current. To increase the flux cutting by the rotor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In salient pole synchronous machine, the reluctance power varies as cosδ sinδ sin2δ cos2δ cosδ sinδ sin2δ cos2δ ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The maximum power developed in cylindrical synchronous machine is occurs at a load angle of 90o. less than 90o. Greater than 90o. 0o. 90o. less than 90o. Greater than 90o. 0o. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The induction motor shaft is made of mild steel. aluminium. stainless steel. cast iron. mild steel. aluminium. stainless steel. cast iron. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The mmf produced by rotor currents of a 3 - Φ induction motor 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. rotates at synchronous speed with respect to rotor. rotates at the speed of rotor in the air gap. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC machine shape of main field flux distribution is? flat tapped or trapezoidal peaky in nature saddle shape triangular flat tapped or trapezoidal peaky in nature saddle shape triangular ANSWER DOWNLOAD EXAMIANS APP
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