Online Electronic Devices Test - Electronic Devices Test 1

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Determining r_d to a high degree of accuracy from a characteristic curve is very accurate.

True

False

[#]

A(n) ________ is the simplest of semiconductor devices.

diode

transistor

operational amplifier

SCR

[#]

Each diode in a center-tapped full-wave rectifier is ________ -biased and conducts for ________ of the input cycle.

forward, 90º

reverse, 180º

forward, 180º

reverse, 90º

[#]

For the "off" state of a Zener diode, the voltage across the diode should be ________.

greater than V_Z

zero

less than V_Z but greater than zero

None of the above

[#]

Typical values of voltage amplification for the common-base configurations vary from ________ and the current gain is always ________ .

less than 1, 50 to 300

50 to 300, larger than 1

50 to 300, less than 1

larger than 1, 50 to 300

[#]

For the BJT to operate in the saturation region, the base-emitter junction must be ________-biased and the base-collector junction must be ________-biased.

forward, forward

forward, reverse

reverse, reverse

reverse, forward

[#]

For R₂ smaller than ________ k

the voltage V_D is equal to V_DD = 16 V.

3.75

12.0

[#]

There is a ________º phase inversion between gate and source in a source follower.

180

none of the above

[#]

Logarithms taken to the base ________ are referred to as common logarithms, while logarithms taken to the base ________ are referred to as natural logarithms.

10, e

e, 10

5, e

10, 5

[#]

10.

What is the level of the current through the amplifier input(s) to ground in an op-amp?

Virtually zero

1.7 mA

2.8 mA

3.3 mA

[#]

11.

Determine the free-running frequency when R₃ is set to 2.5 k

19.7 kHz

32.5 kHz

116.39 kHz

212.9 kHz

[#]

12.

When the input to the 311 voltage comparator is ________ value, the output is ________ if the inverting input is connected to ground.

any negative, low

any positive, low

any positive, high

None of the above

[#]

13.

An input signal is needed for an oscillator to start.

True

False

[#]

14.

In an improved shunt regulator, which of the following components sets the reference voltage?

Transistor Q₁

Zener diode

Transistor Q₂

R_S

[#]

15.

As the forward current through a silicon diode increases, the voltage across the diode

increases to a 0.7 V maximum.

decreases.

is relatively constant.

decreases and then increases.

[#]

16.

What occurs when a conduction-band electron loses energy and falls back into a hole in the valence band?

doping

recombination

generation

[#]

17.

The silicon material used in semiconductors is extremely pure with no additives.

True

False

[#]

18.

Refer to the given figure. The most probable cause of trouble, if any, from these voltage measurements is

the base-emitter junction is open.

R_E is open.

a short from collector to emitter.

no problems.

[#]

19.

A good op-amp has low voltage gain, low output impedance, and high input impedance.

True

False

[#]

20.

Frequency modulation is achieved by varying the frequency of an oscillator with a modulating signal.

True

False

[#]

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Online Electronic Devices Test - Electronic Devices Test 1

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