Electrical Machines The oscillation in a synchronous motor can be damped out by maintaining constant excitation. running the motor on leading power factors. providing damper bars in the rotor pole faces. oscillation cannot be damped. maintaining constant excitation. running the motor on leading power factors. providing damper bars in the rotor pole faces. oscillation cannot be damped. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be 2000 rpm 500 rpm 1000 rpm 250 rpm 2000 rpm 500 rpm 1000 rpm 250 rpm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following DC Motor is used in paper machines? DC Shunt motor. Separately excited DC motor. DC series motor. DC compound motor. DC Shunt motor. Separately excited DC motor. DC series motor. DC compound motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then I1 = I2 I1 < I2 I1 > I2 None of these I1 = I2 I1 < I2 I1 > I2 None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip? 2.5Hz 50Hz 2HZ 1 Hz 2.5Hz 50Hz 2HZ 1 Hz ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because it reduces field structure iron losses commutator action is not possible otherwise it gives more uniform air-gap flux distribution dc machines are comparatively low rating machines. it reduces field structure iron losses commutator action is not possible otherwise it gives more uniform air-gap flux distribution dc machines are comparatively low rating machines. ANSWER DOWNLOAD EXAMIANS APP
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