In case of a balanced three-phase load, each phase has
In case of a balanced three-phase load, each phase has An equal amount of power One-third of total power Two-thirds of total power None of these Correct answer: 1. An equal amount of power
MCQs
In case of a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage
In case of a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage 0 V 156 V 298 V 90 V Correct answer: 2. 156 V
The total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 Ω is given as
The total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 Ω is given as Single-phase 16 A; three-phase 0 A Single-phase 16 A; three-phase 8 A Single-phase 32 A; three-phase 16 A Single-phase 8 A; three-phase 4 A Correct answer: … Read more
The voltages in a three-phase system are separated by
The voltages in a three-phase system are separated by 120° 180° 45° 90° Correct answer: 1. 120°
The correct statement regarding a Y-connected source feeding a ∆-connected load,
The correct statement regarding a Y-connected source feeding a ∆-connected load, Each phase of the load has a voltage across it equal to √3 Each phase of the load has one-third of the full line voltage across it Each phase of the load has the full line voltage across it Each phase of the load … Read more
The most common and popular type of ac motor is
The most common and popular type of ac motor is Single-phase induction motor Three-phase induction motor Two-phase induction motor Two-phase squirrel-cage motor Correct answer: 2. Three-phase induction motor
The correct statement regarding a Y-Y source/load configuration
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
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
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
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°