Electrical Machines A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms. 0.512. 0.443. 0.649. 0.573. 0.512. 0.443. 0.649. 0.573. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines At what power factor, the voltage regulation of a transformer can be zero ? Unity power factor. Leading power factor. Lagging power factor. Zero power factor. Unity power factor. Leading power factor. Lagging power factor. Zero power factor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In synchronous motor, the damper winding is generally used to provide starting torque only. prevent hunting and provide the starting torque. reduce noise level only. reduce the eddy currents. provide starting torque only. prevent hunting and provide the starting torque. reduce noise level only. reduce the eddy currents. ANSWER DOWNLOAD EXAMIANS APP
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 armature emf. reactance voltage induced in the coil. None of these coil resistance. armature emf. reactance voltage induced in the coil. None of these coil resistance. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance? PZL/4Sa² PZL/4S PZL/ 4Sa PZL/4Sp² PZL/4Sa² PZL/4S PZL/ 4Sa PZL/4Sp² ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motor used in hair dryers? Split phase IM. Shaded pole IM. Cage induction motor. Synchronous motors. Split phase IM. Shaded pole IM. Cage induction motor. Synchronous motors. ANSWER DOWNLOAD EXAMIANS APP
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