Electrical Machines A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is 4% 25% 5% 2% 4% 25% 5% 2% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction? 100. 750. 500. 200. 100. 750. 500. 200. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For same HP rating and full load speed which of following motor has poor starting torque? Series. Differently compounded. Cummulative compound. Shunt. Series. Differently compounded. Cummulative compound. Shunt. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator? Armature current. Mechanical power. Induced emf. Can not be determined. Armature current. Mechanical power. Induced emf. Can not be determined. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field? Zero Slip speed None of these Synchronous speed Zero Slip speed None of these Synchronous speed ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generators, the cause of rapid brush wear may be imperfect contact. severe sparking. rough commutator surface. any of above. imperfect contact. severe sparking. rough commutator surface. any of above. ANSWER DOWNLOAD EXAMIANS APP
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