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
In Y-Y system, the source phase currents each have a magnitude of 9 A. The magnitude of each load current for a balanced load condition is 0.125 0.375 Correct answer: 2. 0.375
Polyphase circuits are characterized by two or more sinusoidal voltages, each having a different phase angle FALSE TRUE Correct answer: 2. TRUE
A balanced load is one for which all the impedances are equal FALSE TRUE Correct answer: 2. TRUE
The role of a conservator in transformer is to Protect the transformer from damage when oil expends due to heating Provide fresh air for cooling the transformer Supply cooling oil to transformer in time of need None of these Correct answer: 1. Protect the transformer from damage when oil expends due to heating
The term ‘squirrel-cage’ applies to a type of three-phase ac motor FALSE TRUE Correct answer: 2. TRUE
A three-phase generator is connected to three 90 Ω load resistors. Each coil produces 120 V ac. A common neutral line exists. The current that flows through the common neutral line will be 0 2.66 A 3.99 A Correct answer: 1. 0
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