A single-phase sinusoidal voltage of 120 V is connected to a 90 Ω load. Current in the circuit is 1.33 A 13.5 mA 5.87 A 87.95 mA Correct answer: 1. 1.33 A
For a Y-connected generator, there is a 120° difference between each line voltage and the nearest phase voltage FALSE TRUE Correct answer: 1. FALSE
A two-phase generator is connected to two 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. The current flowing through the common neutral line will be 1.05 A 1.52 A 1.77 A 2.97 A Correct answer: 3. 1.77 A
A simple three-phase generator comprises of three conductive loops separated by 120° FALSE TRUE Correct answer: 2. TRUE
A constant load power implies a uniform conversion of Current to voltage Electrical to mechanical energy Mechanical to electrical energy Voltage to current Correct answer: 2. Electrical to mechanical energy
When the loads are perfectly balanced in a three phase power system the neutral current is At maximum One-third of maximum Two-thirds of maximum Zero Correct answer: 4. Zero
The magnitude of each line current in a Y-connected circuit is Equal to the corresponding phase current One-third the phase current Three times the corresponding phase current Zero Correct answer: 1. Equal to the corresponding phase current
In case of a ∆-connected source feeding a Y-connected load Each phase voltage equals the corresponding load voltage Each phase voltage equals the difference of the corresponding load voltages Each phase voltage is 60° Ωut of phase with the corresponding load voltage Each phase voltage is one-third the corresponding load voltage Correct answer: 2. Each … Read more
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