MCQs

The forward biased pn junction has a resistance of the order: ohms kΩ MΩ GΩ Correct answer: 1. ohms

The depletion region is created by: Diffusion Ionization Recombination All of these Correct answer: 4. All of these

The purpose of using a capacitor in single-stage transistor amplifiers is to: Cool the transistor Protect the transistor Couple or bypass ac component None of the above Correct answer: 3. Couple or by pass ac component

RC coupling in multistage transistor amplifiers is used for amplification of: Power Voltage Current None of these Correct answer: 2. Voltage

Of below-mentioned statements which of the following is not correct regarding h parameters of transistor: Value of h parameters depend on transistor configuraton Values depend on operating point point Values of h parameter can’t be obtained from transistor characteristics None of these Correct answer: 3. Values of h parameter can’t be obtained from transistor characteristics

Corona losses are minimized when: Smooth conductor is used Conductor size is reduced Current density in conductors in reduced None of above Correct answer: 1. Smooth conductor is used

The string efficiency of high voltage line is around: 10% 20% 40% 80% Correct answer: 4. 80%

For magnetic blow out of arc the magnetic field is produced: In line with the axis of the arc In the load circuit At right angles to the axis of the arc None of above Correct answer: 3. At right angles to the axis of the arc

Zero sequence-fault current is absent for which class of fault: Line to Line ground fault Single line to ground fault Double line to ground fault Line to line fault Correct answer: 4. Line to line fault