A three-phase ∆-connected generator is driving a balanced load such that each phase current is 12 A in magnitude. When Iθa = 12 ∠30° A, the polar expressions for the other phase currents are Iθb = 12 ∠120° A, Iθc = 12 ∠30° A Iθb = 12 ∠150° A, Iθc = 12 ∠-90° A Iθb … Read more
The correct statement regarding a Y-Y source/load configuration Line current and the load current are in phase and both are out of phase with the phase current Phase current and the line current are in phase and both are 120° out of phase with the load current Phase current, the line current and the load … Read more
The phase voltages in a certain three-wire Y-connected generator are 2 kV. The magnitudes of the line voltages are 2,000 V 3,464 V 333 V 6,000 V Correct answer: 2. 3,464 V
Alternator is an electromechanical ac generator True False Correct answer: 2. FALSE
In case of a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of 0° 120° 30° 60° Correct answer: 3. 30°
A simple two-phase generator comprises of two conductive loops that are separated by 90°, rotating in a magnetic field FALSE TRUE Correct answer: 2. TRUE
Electrical Engineering MCQs on Synchronous Motor Part 14 If field circuit of an unloaded salient pole synchronous motor gets suddenly open-circuited then If field circuit of an unloaded salient pole synchronous motor gets suddenly open-circuited then Correct answer: 4. The motor stops The motor that is non self-starting The motor that is non self-starting Correct … Read more
Electrical Engineering MCQs on Synchronous Motor Part 13 In order to limit the operating temperature an electrical machine should have proper In order to limit the operating temperature an electrical machine should have proper Correct answer: 1. Current rating Generally, synchronous motors are of Generally, synchronous motors are of Correct answer: 3. Salient pole type … Read more
Electrical Engineering MCQs on Electrical Traction MCQs Part 2 The specific energy consumption of a train depends on The specific energy consumption of a train depends on Correct answer: 4. All of these The rate of acceleration on suburban or urban service is in the range The rate of acceleration on suburban or urban service … Read more
Electrical Engineering MCQs on Electrical Traction MCQs Part 1 For diesel locomotives the range of horsepower is For diesel locomotives the range of horsepower is Correct answer: 1. 1500 to 2500 Long distance railways utilize Long distance railways utilize Correct answer: 2. 25 kV single phase AC Tractive effort is required to Tractive effort is … Read more