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 disadvantage of a half-wave rectifier is that the Components are expensive Diodes must have a higher power rating Output is difficult to filter None of these Correct answer: 3. Output is difficult to filter
A zener diode is employed as A Multivibrator A Rectifier A Voltage Regulator An Amplifier Correct answer: 3. A Voltage Regulator
Which of following rectifiers has the lowest forward resistance Gas Tube Solid State Vacuum Tube None of these Correct answer: 2. Solid State
If temperature of crystal diode increases then leakage current Becomes zero Decreases Increases Remains the same Correct answer: 3. Increases
The leakage current in a crystal diode is due to which of following Junction Capacitance Majority Carriers Minority Carriers None of these Correct answer: 3. Minority Carriers
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