MCQs

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

Ammeter is used to measure power in a three-phase load FALSE TRUE Correct answer: 1. FALSE

If arrow of crystal diode symbol is positive with respect to bar, then diode is Either forward or reverse Forward biased Reverse biased None of these Correct answer: 2. Forward biased

For a ∆-connected generator, there is a 120° difference between each line current and the nearest phase current FALSE TRUE Correct answer: 1. FALSE

When crystal current diode current is large the bias is Forward Inverse Poor Reverse Correct answer: 1. Forward

Polyphase generators generate simultaneous multiple sinusoidal voltages that are separated by Constant currents Constant frequencies Constant phase angles Constant voltages Correct answer: 3. Constant phase angles

The knee voltage of a crystal diode is roughly equal to Applied Voltage Barrier Potential Breakdown Voltage Forward Voltage Correct answer: 2. Barrier Potential