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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Pinch-off voltage VP for an FET is the drain voltage at which

drain current becomes zero

significant drain current starts flowing

all free charges get removed from the channel

avalanche break down takes place

None

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

depends on the concentration of majority carriers

depends on the width of the depletion region

must be greater than 0.7 V

must be greater than 0.3 V

None

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

low input impedance

high input impedance

low power consumption

a reverse-biased PN junction

None

Zener diodes are used as:

AF detectors

RF detectors

voltage regulators

current regulators

None

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

117 Hz

62.5 V

100 V

125 V

None

In a bipolar transistor, the _____________compares closest to the control grid of a triode vacuum tube.

base

collector

source

emitter

None

The average value of a half-wave rectified voltage with a peak value of 200 V is

127.3 V

63.7 V

0 V

141 V

None

When the peak output voltage is 100 V, the PIV for each diode in a center-tapped full-wave rectifier is (neglecting the diode drop)

141 V

200 V

100 V

50 V

None

A varactor diode exhibits

a variable capacitance that depends on reverse voltage

a constant capacitance over a range of reverse voltages

a variable capacitance that depends on forward current

a variable resistance that depends on reverse voltage

None

A transistor can be destroyed in a circuit by:

excessive light

cut-off

excessive heat

saturation

None

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

0.6 V

5.0 V

6 mV

2.88 V

None

A semiconductor having its leads labeled gate, drain, and source is best described as a:

gated transistor

field-effect transistor

bipolar transistor

silicon diode

None

For operation as an amplifier, the base of a npn transistor must be

negative with respect to the emitter

positive with respect to the collector

0 V

positive with respect to the emitter

None

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

0.7 V

5.7 V

4.3 V

0.3 V

None

Pinch-off voltage VP for an FET is the drain voltage at which

avalanche break down takes place

significant drain current starts flowing

all free charges get removed from the channel

drain current becomes zero

None

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

Schottky

Tunnel

Zener

P-N junction

None

If you wish to reduce the current flowing in a field effect transistor, you could:

increase the reverse bias voltage

increase the forward bias gain

decrease the reverse bias voltage

increase the forward bias voltage

None

The diode in which impurities are heavily doped is

Varactor diode

Tunnel diode

Zener diode

PIN diode

None

What semiconductor device glows red, yellow, or green, depending upon its chemical composition?

A fluorescent bulb

A vacuum diode

A light-emitting diode

A neon bulb

None

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