Electrical Machines Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to None of these coil resistance. reactance voltage induced in the coil. armature emf. None of these coil resistance. reactance voltage induced in the coil. armature emf. ANSWER DOWNLOAD EXAMIANS APP
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 increase the flux cutting by the rotor. To convert alternating supply current to direct current. None of these. To absorb the mechanical shocks produced during running condition. To increase the flux cutting by the rotor. To convert alternating supply current to direct current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H? 2 V 1 V 0 V 4 V 2 V 1 V 0 V 4 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be about 50 V. 220 V. zero. about 2 V. about 50 V. 220 V. zero. about 2 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature reaction in DC generators will result in open circuit. increase in slip. short circuit. reduction in generated emf. open circuit. increase in slip. short circuit. reduction in generated emf. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs decrease. increase. None of these either of these. decrease. increase. None of these either of these. ANSWER DOWNLOAD EXAMIANS APP
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