Electrical Machines Hopkinson test is conducted under which of the following condition? half load any of the above no load full load half load any of the above no load full load ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If in DC Shunt Motor the flux is reduced suddenly to zero, then the speed of motor will be reduced. the armature current will reduce. the motor will come to stop. the motor will attain dangerously high speed. the speed of motor will be reduced. the armature current will reduce. the motor will come to stop. the motor will attain dangerously high speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The oscillation in a synchronous motor can be damped out by oscillation cannot be damped. providing damper bars in the rotor pole faces. running the motor on leading power factors. maintaining constant excitation. oscillation cannot be damped. providing damper bars in the rotor pole faces. running the motor on leading power factors. maintaining constant excitation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm? Can be determined. 20 Hz. 30 Hz. 35 Hz. Can be determined. 20 Hz. 30 Hz. 35 Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator sparking between brushes and commutator surface may be due to under commutation. too rapid reversal of current. any of the above. over commutation. under commutation. too rapid reversal of current. any of the above. over commutation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is 3000 rpm. 1500 rpm. 3600 rpm. 4000 rpm. 3000 rpm. 1500 rpm. 3600 rpm. 4000 rpm. ANSWER DOWNLOAD EXAMIANS APP
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