Explore topic-wise MCQs in Active Filter Circuits.

This section includes 50 Mcqs, each offering curated multiple-choice questions to sharpen your Active Filter Circuits knowledge and support exam preparation. Choose a topic below to get started.

1.

Collector-feedback bias is another name for base bias.

A. True
B. False
Answer» C.
Discussion
2.

The base bias circuit is not beta-dependent.

A. True
B. False
Answer» C.
Discussion
3.

Base biasing is common in relay driver circuits.

A. True
B. False
Answer» B. False
Discussion
4.

A pnp transistor requires the same bias polarities as the npn transistor.

A. True
B. False
Answer» C.
Discussion
5.

The input resistance at the base of a transistor is RIN DCIBRE.

A. True
B. False
Answer» C.
Discussion
6.

The formula DC = IB/IC is correct.

A. True
B. False
Answer» C.
Discussion
7.

Collector-feedback bias provides very poor stability with negative feedback from collector to base.

A. True
B. False
Answer» C.
Discussion
8.

The purpose of biasing is to establish a proper Q-point.

A. True
B. False
Answer» B. False
Discussion
9.

The base bias circuit arrangement provides poor stability because its Q-point varies widely with DC.

A. True
B. False
Answer» B. False
Discussion
10.

A transistor is operating in a linear fashion at saturation.

A. True
B. False
Answer» C.
Discussion
11.

Refer to this figure. In the voltage-divider biased npn transistor circuit, if R1 opens, the transistor is

A. saturated.
B. cutoff.
C. nonconducting.
Answer» C. nonconducting.
Discussion
12.

Refer to this figure. In the voltage-divider biased npn transistor circuit, if R2 opens, the transistor is

A. saturated.
B. cutoff.
C. nonconducting.
Answer» B. cutoff.
Discussion
13.

Refer to this figure. In the voltage-divider biased npn transistor circuit, if RC opens, the transistor is

A. saturated.
B. cutoff.
C. nonconducting.
Answer» D.
Discussion
14.

Which transistor bias circuit arrangement has poor stability because its Q-point varies widely with DC?

A. base bias
B. collector-feedback bias
C. voltage-divider bias
D. emitter bias
Answer» B. collector-feedback bias
Discussion
15.

The linear (active) operating region of a transistor lies along the load line below ________ and above ________.

A. cutoff, saturation
B. saturation, cutoff
Answer» C.
Discussion
16.

At saturation the value of VCE is nearly ________, and IC = ________.

A. zero, zero
B. VCC, IC(sat)
C. zero, I(sat)
D. VCC, zero
Answer» D. VCC, zero
Discussion
17.

Refer to this figure. Assume IC IE. Determine the value of RC that will allow VCE to equal 10 V.

A. 1 k
B. 1.5 k
C. 2 k
D. 2.5 k
Answer» C. 2 k
Discussion
18.

Refer to this figure. Calculate the current I2.

A. 32 mA
B. 3.2 mA
C. 168 A
D. 320 A
Answer» E.
Discussion
19.

Refer to this figure. Assume that IC IE. Find VE.

A. 5 V
B. 10 V
C. 15 V
D. 2.5 V
Answer» E.
Discussion
20.

Refer to this figure. Determine IC.

A. 5 A
B. 5 mA
C. 0 mA
D. 10 mA
Answer» C. 0 mA
Discussion
21.

Refer to this figure. The value of IB is

A. 53 A.
B. 50 A.
C. 50 mA.
D. 53 mA.
Answer» C. 50 mA.
Discussion
22.

Refer to this figure. The value of IC is

A. 10 A.
B. 10 mA.
C. 5 mA.
D. 50 mA.
Answer» D. 50 mA.
Discussion
23.

What is the Q-point for a fixed-bias transistor with IB = 75 A, DC = 100, VCC = 20 V, and RC = 1.5 k?

A. VC = 0 V
B. VC = 20 V
C. VC = 8.75 V
D. VC = 11.25 V
Answer» D. VC = 11.25 V
Discussion
24.

Changes in DC result in changes in

A. I C .
B. V CE .
C. the Q-point.
D. all of the above
Answer» E.
Discussion
25.

Refer to this figure. In the voltage-divider biased npn transistor circuit, if R 1 opens, the transistor is

A. saturated.
B. cutoff.
C. nonconducting.
D. -
Answer» C. nonconducting.
Discussion
26.

Refer to this figure. Calculate the current I 2 .

A. 32 mA
B. 3.2 mA
C. 168 A
D. 320 A
Answer» E.
Discussion
27.

Which transistor bias circuit arrangement provides good Q-point stability, but requires both positive and negative supply voltages?

A. base bias
B. collector-feedback bias
C. voltage-divider bias
D. emitter bias
Answer» E.
Discussion
28.

Refer to this figure. The value of I C is

A. 10 A.
B. 10 mA.
C. 5 mA.
D. 50 mA.
Answer» D. 50 mA.
Discussion
29.

The input resistance of the base of a voltage-divider biased transistor can be neglected

A. at all times.
B. only if the base current is much smaller than the current through R 2 (the lower bias resistor).
C. at no time.
D. only if the base current is much larger than the current through R 2 (the lower bias resistor).
Answer» C. at no time.
Discussion
30.

Refer to this figure. Assume I C I E . Determine the value of R C that will allow V CE to equal 10 V.

A. 1 k
B. 1.5 k
C. 2 k
D. 2.5 k
Answer» C. 2 k
Discussion
31.

Voltage-divider bias has a relatively stable Q-point, as does

A. base bias.
B. collector-feedback bias.
C. both of the above
D. none of the above
Answer» C. both of the above
Discussion
32.

At saturation the value of V CE is nearly ________, and I C = ________.

A. zero, zero
B. V CC , I C(sat)
C. zero, I (sat)
D. V CC , zero
Answer» D. V CC , zero
Discussion
33.

Refer to this figure. Determine I C .

A. 5 A
B. 5 mA
C. 0 mA
D. 10 mA
Answer» C. 0 mA
Discussion
34.

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

A. the base-emitter junction is open.
B. R E is open.
C. a short from collector to emitter.
D. no problems.
Answer» C. a short from collector to emitter.
Discussion
35.

What is the most common bias circuit?

A. base
B. collector
C. emitter
D. voltage-divider
Answer» E.
Discussion
36.

Which transistor bias circuit arrangement has poor stability because its Q-point varies widely with DC ?

A. base bias
B. collector-feedback bias
C. voltage-divider bias
D. emitter bias
Answer» B. collector-feedback bias
Discussion
37.

Refer to this figure. In the voltage-divider biased npn transistor circuit, if R C opens, the transistor is

A. saturated.
B. cutoff.
C. nonconducting.
D. -
Answer» D. -
Discussion
38.

Refer to this figure. Assume that I C I E . Find V E .

A. 5 V
B. 10 V
C. 15 V
D. 2.5 V
Answer» E.
Discussion
39.

Refer to this figure. The value of DC is

A. 5.3.
B. 53.
C. 94.
D. 100.
Answer» E.
Discussion
40.

Emitter bias requires

A. only a positive supply voltage.
B. only a negative supply voltage.
C. no supply voltage.
D. both positive and negative supply voltages.
Answer» E.
Discussion
41.

What is the Q-point for a fixed-bias transistor with I B = 75 A, DC = 100, V CC = 20 V, and R C = 1.5 k ?

A. V C = 0 V
B. V C = 20 V
C. V C = 8.75 V
D. V C = 11.25 V
Answer» D. V C = 11.25 V
Discussion
42.

The most stable biasing technique used is the

A. voltage-divider bias.
B. base bias.
C. emitter bias.
D. collector bias.
Answer» B. base bias.
Discussion
43.

Refer to this figure. The value of I B is

A. 53 A.
B. 50 A.
C. 50 mA.
D. 53 mA.
Answer» C. 50 mA.
Discussion
44.

Ideally, for linear operation, a transistor should be biased so that the Q-point is

A. near saturation.
B. near cutoff.
C. where I C is maximum.
D. halfway between cutoff and saturation.
Answer» E.
Discussion
45.

Refer to this figure. In the voltage-divider biased npn transistor circuit, if R 2 opens, the transistor is

A. saturated.
B. cutoff.
C. nonconducting.
D. -
Answer» B. cutoff.
Discussion
46.

Which transistor bias circuit provides good Q-point stability with a single-polarity supply voltage?

A. base bias
B. collector-feedback bias
C. voltage-divider bias
D. emitter bias
Answer» D. emitter bias
Discussion
47.

What is the dc input resistance at the base of a BJT?

A. DC R C
B. DC ·( )
C. DC ·r e ?
D. DC R E
Answer» E.
Discussion
48.

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

A. the base-emitter junction is open.
B. R E is open.
C. a short from collector to emitter.
D. no problems.
Answer» B. R E is open.
Discussion
49.

Which transistor bias circuit arrangement provides good stability using negative feedback from collector to base?

A. base bias
B. collector-feedback bias
C. voltage-divider bias
D. emitter bias
Answer» C. voltage-divider bias
Discussion
50.

Clipping is the result of

A. the input signal being too large.
B. the transistor being driven into saturation.
C. the transistor being driven into cutoff.
D. all of the above
Answer» E.
Discussion