Diodes and Transistors

MCQTrip.com will help you test your knowledge of diodes and transistors, including types, construction, operation, applications, biasing, etc, with this online multiple choice quiz. See how well you understand the basics of these electronic components. Twenty (20) MCQ questions from our test bank will be randomly shown for every attempt. Passing mark for this test is 70%.

Objectives: To provide an online multiple choice quiz to test the reader’s knowledge of diodes and transistors.

Welcome to Diodes and Transistors. The quiz will randomly run 20 questions from Diodes and Transistors which you have to answer in 10 minutes.

After 10 minutes, your quiz will automatically be submitted and scored.

You can retake the quiz as many times as you want and a different set of questions will be given. The answers will also be randomly arrange.

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The action of changing alternating current to direct current is called:

modulation

rectification

transformation

amplification

Compared to bipolar transistor, a JFET has

higher input impedance and high voltage gain

higher voltage gain

higher input impedance and low voltage gain

lower input impedance

Avalanche breakdown results basically due to

strong electric field across the junction

impact ionisation

rise in temperature

emission of electrons

The total secondary voltage in a center-tapped full-wave rectifier is 125 rms. Neglecting the diode drop, the rms output voltage is

62.5 V

125 V

100 V

117 Hz

The varactor diode is usually

Unbiased

holes and electronics

reverse biased

Forward biased

A 60 V peak full-wave rectified voltage is applied to a capacitor-input filter. If f = 120 Hz. RL = 10 k Ω and C = 10 μF, the ripple voltage is

5.0 V

6 mV

0.6 V

2.88 V

The primary purpose of a Zener diode is to:

provide a path through which current can flow

provide a voltage phase shi

to boost the power supply voltage

regulate or maintain a constant voltage

Line regulation is determined by

changes in load resistance and output voltage

load current

zener current and load current

changes in output voltage and input voltage

Which of the following diodes is operated in reverse bias mode ?

P-N junction

Tunnel

Zener

Schottky

Zener diodes are used as:

AF detectors

voltage regulators

current regulators

RF detectors

The peak value of the input to a half-wave rectifier is 10 V. The approximate peak value of the output is

10.7 V

10 V

3.18 V

9.3 V

In a semiconductor diode, electrons flow from:

anode to cathode

cathode to grid

grid to anode

cathode to anode

Zener diodes are most commonly used in:

oscillator circuits

power supply circuits

current limiting circuits.

voltage amplifier circuits

The diode in which impurities are heavily doped is

Varactor diode

PIN diode

Tunnel diode

Zener diode

A transistor in common emitter mode has

a high input resistance and low output resistance

a medium input resistance and high output resistance

a very low input resistance and a low output resistance

a high input resistance and a high output resistance

Which configuration has unity voltage gain (ideal)

CE followed by CB

a Common Base (CB)

a Common Emitter (CE

a Common Collector (CC)

A silicon diode is in series with 1.0 kΩ resistor and a 5 V battery. If the anode is connected to the positive battery terminal, the cathode voltage with respect to the negative battery terminal is

4.3 V

0.7 V

0.3 V

5.7 V

For a silicon diode, the value of the forward-bias voltage typically

depends on the width of the depletion region

must be greater than 0.7 V

depends on the concentration of majority carriers

must be greater than 0.3 V

Compared to bipolar transistors, field effect transistors are NOT normally characterized by:

low input impedance

a reverse-biased PN junction

low power consumption

high input impedance

A transistor can be destroyed in a circuit by:

excessive heat

excessive light

saturation

cut-off

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