Electrical Machines An ideal DC generated is one that has _____________ voltage regulation. zero. negative. positive. low. zero. negative. positive. low. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is 8. 1/4. 4. 1/2. 8. 1/4. 4. 1/2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is: Zero Hz. 50 Hz. 25 Hz. 100 Hz. Zero Hz. 50 Hz. 25 Hz. 100 Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The rotor slots are slightly skewed in squirrel cage induction motor to reduce the magnetic hum and locking tendency of rotor. provide ease of fabrication. decrease the amount of copper to be used. increase the strength of rotor bars. reduce the magnetic hum and locking tendency of rotor. provide ease of fabrication. decrease the amount of copper to be used. increase the strength of rotor bars. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If field current is decreased in shunt dc motor, the speed of the motor increases. remains same. None of these decreases. increases. remains same. None of these decreases. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A compound dc generator is delivering full load current at a terminal voltage of 230 V. Its series-field winding gets short circuited. If its terminal voltage 1. becomes more than 230 V, it is overcompounded generator 2. becomes more than 230 V, it is differentially compounded generator 3. becomes less than 230 V, it is overcompounded generator 4. becomes less than 230 V, it is differentially compounded generator 5. becomes less than 230 V, it is level compounded generator From these, the correct answer is 2,3 1, 4 2, 3, 5 1, 4, 5 2,3 1, 4 2, 3, 5 1, 4, 5 ANSWER DOWNLOAD EXAMIANS APP