Explore topic-wise MCQs in Electronic Devices.

This section includes 25 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices knowledge and support exam preparation. Choose a topic below to get started.

1.

Calculate the approximate value of the maximum power rating for the transistor represented by the output characteristics of Figure 4.1?

A. 250 mW
B. 170 mW
C. 50 mW
D. 0 mW
Answer» C. 50 mW
Discussion
2.

A significant increase in leakage current due to increase in temperature creates ________between I curves.

A. smaller spacing
B. larger spacing
C. the same space as at lower temperature
D. None of the above
Answer» C. the same space as at lower temperature
Discussion
3.

The saturation current of a transistor used in a fixed-bias circuit is ________ its value used in an emitter-stabilized or voltage-divider bias circuit for the same values of R.

A. more than
B. the same as
C. less than
D. None of the above
Answer» B. the same as
Discussion
4.

In a fixed-bias circuit, the magnitude of I is controlled by and therefore is a function of ________.

A. R
B. R
C. R
D. and
Answer» E.
Discussion
5.

As the temperature increases, ________, V ________, and I ________ in value for every 10ºC.

A. increases, decreases, doubles
B. decreases, increases, remains the same
C. decreases, increases, doubles
D. increases, increases, triples
Answer» B. decreases, increases, remains the same
Discussion
6.

In any amplifier employing a transistor, the collector current I is sensitive to ________.

A. V
B. I
C. All of the above
Answer» E.
Discussion
7.

In a fixed-bias circuit with a fixed supply voltage V, the selection of a ________ resistor sets the level of ________ current for the operating point.

A. collector, base
B. base, base
C. collector, collector
D. None of the above
Answer» C. collector, collector
Discussion
8.

In an emitter-bias configuration, the ________ the resistance R, the ________ the stability factor, and the ________ stable is the system.

A. smaller, lower, less
B. larger, more, more
C. smaller, more, more
D. larger, lower, more
Answer» E.
Discussion
9.

The cutoff region is defined by I ________ 0 A.

A. >
B. <
Answer» D.
Discussion
10.

Determine the reading on the meter when V = 20 V, R = 5 k, and I = 2 mA.

A. 10 V
B. –10 V
C. 0.7 V
D. 20 V
Answer» B. –10 V
Discussion
11.

Calculate the value of V.

A. 8.78 V
B. 0 V
C. 7.86 V
D. 18 V
Answer» D. 18 V
Discussion
12.

For what value of does the transistor enter the saturation region?

A. 20
B. 50
C. 75
D. 116
Answer» E.
Discussion
13.

Calculate the voltage across the 91 k resistor.

A. 18 V
B. 9.22 V
C. 3.23 V
D. None of the above
Answer» D. None of the above
Discussion
14.

In the case of this circuit, you must assume that V = 0.1·V in order to calculate R and R.

A. True
B. False
Answer» B. False
Discussion
15.

For an "on" transistor, the voltage V should be in the neighborhood of 0.7 V.

A. True
B. False
Answer» B. False
Discussion
16.

Calculate E for this network.

A. −12.12 V
B. 16.35 V
C. −3.65 V
D. 10 V
Answer» D. 10 V
Discussion
17.

Calculate I.

A. 35.29 mA
B. 5.45 mA
C. 1.86 mA
D. 4.72 mA
Answer» E.
Discussion
18.

Calculate the storage time in a transistor switching network if t is 56 ns, t = 14 ns, and t = 20 ns.

A. 70 ns
B. 42 ns
C. 36 ns
D. 34 ns
Answer» C. 36 ns
Discussion
19.

Determine I at a temperature of 175º C if I = 2 mA at 25º C for R / R = 20 due to the S() stability factor.

A. 2.417 mA
B. 2.392 mA
C. 2.25 mA
D. 2.58 mA
Answer» B. 2.392 mA
Discussion
20.

Which of the following voltages must have a negative level (value) in any bias circuit?

A. V
B. V
C. V
D. None of the above
Answer» D. None of the above
Discussion
21.

Use this table to determine the change in I from 25ºC to 175ºC for R / R = 250 due to the S(I) stability factor. Assume an emitter-bias configuration.

A. 140.34 nA
B. 140.34
C. A
D. 42.53 nA
E. 0.14034 nA
Answer» C. A
Discussion
22.

For the typical transistor amplifier in the active region, V is usually about ________ % to ________ % of V.

A. 10, 60
B. 25, 75
C. 40, 90
Answer» C. 40, 90
Discussion
23.

The total time required for the transistor to switch from the "off" to the "on" state is designated as t and defined as the delay time plus the time element.

A. True
B. False
Answer» B. False
Discussion
24.

Calculate R if V = 0.3 V.

A. 49.2
B. 49.2 k
C. 49.2 m
D. 49.2 M
Answer» B. 49.2 k
Discussion
25.

The saturation region is defined by V ________ V.

A. >
B. <
Answer» D.
Discussion