Electrical Machines What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field? None of these Synchronous speed Zero Slip speed None of these Synchronous speed Zero Slip speed ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly 240 V 175 V 140 V 120 V 240 V 175 V 140 V 120 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________. increased. decreased. kept constant to certain value. remains unchanged. increased. decreased. kept constant to certain value. remains unchanged. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Oil is provided in an oil filled transformer for insulating. cooling. lubrication. both cooling and insulation. insulating. cooling. lubrication. both cooling and insulation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be 36. 80. 18. 50. 36. 80. 18. 50. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In synchronous motor the torque is proportional to 1/P² P² Power P 1/P 1/P² P² Power P 1/P ANSWER DOWNLOAD EXAMIANS APP
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