1. Calculate the voltage regulation in the synchronous machine if the no-load voltage is 12 V and the full load voltage is 15V. A. -20% B. -40% C. -60% D. -80% 2. Calculate the condition for maximum voltage regulation in the synchronous machine. A. Φ=ϴs B. Φ=2ϴs C. Φ=4ϴs D. Φ=8ϴs 3. Zero …
1. In the rotor voltage injection method, when an external voltage source is in phase with the main voltage then speed will ___________ A. Increase B. Decrease C. Remain unchanged D. First increases then decrease 2. A 2-pole, 3-phase, ______ Hz induction motor is operating at a speed of 550 rpm. The frequency of …
1. A 32-pole, 3-phase, 70 Hz induction motor is operating at a speed of 112 rpm. The frequency of the rotor current of the motor in Hz is __________ A. 40.2 B. 46.1 C. 40.1 D. 40.6 2. A 20-pole, 3-phase, 90 Hz induction motor is operating at a speed of _______ rpm. The …
1. 40 V, 7 A, 70 rpm DC separately excited motor having a resistance of 0.3 ohms excited by an external dc voltage source of 4 V. Calculate the torque developed by the motor on half load. A. 18.10 N-m B. 4.24 N-m C. 40.45 N-m D. 52.64 N-m 2. Calculate the active power …
1. 40 V, 7 A, 70 rpm DC separately excited motor having a resistance of 0.3 ohms excited by an external dc voltage source of 4 V. Calculate the torque developed by the motor on half load. A. 18.10 N-m B. 4.24 N-m C. 40.45 N-m D. 52.64 N-m 2. Calculate the active power …
1. 40 V, 7 A, 70 rpm DC separately excited motor having a resistance of 0.3 ohms excited by an external dc voltage source of 4 V. Calculate the torque developed by the motor on half load. A. 18.10 N-m B. 4.24 N-m C. 40.45 N-m D. 52.64 N-m 2. Calculate the active power …
1. 40 V, 7 A, 70 rpm DC separately excited motor having a resistance of 0.3 ohms excited by an external dc voltage source of 4 V. Calculate the torque developed by the motor on half load. A. 18.10 N-m B. 4.24 N-m C. 40.45 N-m D. 52.64 N-m 2. Calculate the active power …
1. In the chopper circuit, commutation times are _______ A. Current commutation is equal to voltage commutation B. Current commutation is less as compared to that of voltage commutation C. Current commutation is more as compared to that of voltage commutation D. Both commutation techniques are not comparable 2. The generated e.m.f from 4-pole …
1. In the chopper circuit, commutation times are _______ A. Current commutation is equal to voltage commutation B. Current commutation is less as compared to that of voltage commutation C. Current commutation is more as compared to that of voltage commutation D. Both commutation techniques are not comparable 2. The generated e.m.f from 4-pole …
1. A particular current is made up of two components: a 10 A and a sine wave of peak value 14.14 A. The average value of current is _________ A. Zero B. 24.14 A C. 10 A D. 14.14 A 2. A 38-pole, 3-phase, 80 Hz induction motor is operating at a speed of …
