Explore topic-wise MCQs in Testing Subject.

This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.

1.

What is the value of trans conductance?

A. 1
B. 2 c) 0.1
C. d) 0.01
Answer» D.
Discussion
2.

What is trans-conductance?

A. ratio of change in drain current to change in collector current
B. ratio of change in drain current to change in gate to source voltage
C. ratio of change in collector current to change in drain current
D. ratio of change in collector current to change in gate to source voltage
Answer» C. ratio of change in collector current to change in drain current
Discussion
3.

Determine the voltage gain for the given circuit known that R1 = R3 = 10kΩ abd R2 = R4 = 100kΩ.

A. 1
B. 10 c) 100 d) 1000
Answer» C.
Discussion
4.

Determine Ad and Ac for the given circuit.

A. ac = 0 and ad = 1
B. ac ≠ 0 and ad = 1
C. ac = 0 and ad ≠ 1
D. ac ≠ 0 and ad ≠ 1
Answer» B. ac ≠ 0 and ad = 1
Discussion
5.

For the circuit shown below express v0 as a function of v1 and v2.

A. v0 = v1 + v2
B. v0 = v2 – v1
C. v0 = v1 – v2 d) v0 = -v1 – v2
Answer» C. v0 = v1 – v2 d) v0 = -v1 – v2
Discussion
6.

For the difference amplifier which of the following is true?

A. it responds to the difference between the two signals and rejects the signal that are common to both the signal
B. it responds to the signal that are common to the two inputs only
C. it has a low value of input resistance
D. the efficacy of the amplifier is measured by the degree of its differential signal to the preference of the common mode signal
Answer» B. it responds to the signal that are common to the two inputs only
Discussion
7.

The problem with the single operational difference amplifier is its

A. high input resistance
B. low input resistance
C. low output resistance
D. none of the mentioned
Answer» C. low output resistance
Discussion
8.

In a Single Input Balanced Output Differential amplifier, given VCC=15v, RE = 3.9kΩ, VCE=2.4 v and re=250Ω. Determine Voltage gain

A. 26
B. 56
C. 38
D. 61
Answer» B. 56
Discussion
9.

Find IC, given VCE=0.77v, VCC=10v, VBE=0.37v and RC=2.4kΩ in Dual Input Balanced Output differential amplifier

A. 0.4ma
B. 0.4a
C. 4ma
D. b) d) 4a
Answer» D. b) d) 4a
Discussion
10.

In ideal Differential Amplifier, if same signal is given to both inputs, then output will be

A. same as input
B. double the input
C. not equal to zero
D. zero
Answer» E.
Discussion
11.

Obtain the collector voltage, for collector resistor (RC) =5.6kΩ, IE=1.664mA and VCC=10v for single input unbalanced output differential amplifier

A. 0.987v
B. 0.682v c) 0.555v
C. d) none of the mentioned
Answer» C. d) none of the mentioned
Discussion
12.

A differential amplifier is capable of amplifying

A. dc input signal only
B. ac input signal only
C. ac & dc input signal
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
13.

If output is measured between two collectors of transistors, then the Differential amplifier with two input signal is said to be configured as

A. dual input balanced output
B. dual input unbalanced output
C. single input balanced output
D. dual input unbalanced output
Answer» B. dual input unbalanced output
Discussion
14.

A Differential Amplifier should have collector resistor’s value (RC1 & RC2) as

A. 5kΩ, 5kΩ
B. 5Ω, 10kΩ
C. 5Ω, 5kΩ
D. 5kΩ, 10kΩ
Answer» B. 5Ω, 10kΩ
Discussion
15.

A Differential Amplifier amplifies

A. input signal with higher voltage
B. input voltage with smaller voltage
C. sum of the input voltage
D. none of the mentioned
Answer» E.
Discussion
16.

In the given circuit, hfe = 50 and hie = 1000Ω, find overall input and output resistance.

A. ri=956Ω, ro=1.6 kΩ
B. ri=956 kΩ, ro=2 kΩ
C. ri=956 Ω, ro=2 kΩ
D. ri=900Ω, ro=10 kΩ
Answer» D. ri=900Ω, ro=10 kΩ
Discussion
17.

1, α2 = 1.5 what is the transconductance of the entire network?

A. 80 mΩ-1
B. 75 mΩ-1
C. 33 mΩ-1
D. 55 mΩ-1
Answer» E.
Discussion
18.

What is a cascode amplifier?

A. a cascade of two ce amplifiers
B. a cascade of two cb amplifiers
C. a cascade of ce and cb amplifiers
D. a cascade of cb and cc amplifiers
Answer» D. a cascade of cb and cc amplifiers
Discussion
19.

Consider a Darlington amplifier. In the self bias network, the biasing resistances are 220kΩ and 400 kΩ. What can be the correct value of input resistance if hfe=50 and emitter resistance = 10kΩ.

A. 141 kΩ
B. 15 mΩ
C. 20 mΩ
D. 200 kΩ
Answer» B. 15 mΩ
Discussion
20.

What is the need for bootstrap biasing?

A. to prevent a decrease in the gain of network
B. to prevent an increase in the input resistance due to the biasing network
C. to prevent a decrease in the input resistance due to the presence of multiple bjt amplifiers
D. to prevent a decrease in the input resistance due to the biasing network
Answer» C. to prevent a decrease in the input resistance due to the presence of multiple bjt amplifiers
Discussion
21.

In a Darlington pair, the overall β=15000.β1=100. Calculate the collector current for Q2 given base current for Q1 is 20 μA.

A. 300 ma
B. 298 ma
C. 2 ma
D. 200ma
Answer» C. 2 ma
Discussion
22.

Which of these are incorrect about Darlington amplifier?

A. it has a high input resistance
B. the output resistance is low
C. it has a unity voltage gain
D. it is a current buffer
Answer» E.
Discussion
23.

The transconductance of a B.J.T.is 5mS (gm) while a 2KΩ (Rl) load resistance is connected to the C.E. stage. Neglecting Early effect, what is the Miller multiplication factor for the input side?

A. 21
B. 11
C. 20
Answer» C. 20
Discussion
24.

If 1/h12 = 4, for a C.E. stage- what is the value of the base to collector capacitance, after Miller multiplication, at the input side?

A. 4cµ
B. 5cµ
C. 6cµ d) 1.1cµ
Answer» D.
Discussion
25.

If the B.J.T. is used as a follower, which capacitor experiences Miller multiplication?

A. cπ
B. cµ
C. ccs
D. cb
Answer» B. cµ
Discussion
26.

In a simple follower stage, C2 is a parasitic capacitance arising due to the depletion region between the collector and the substrate. What is the value of C2?

A. 0
B. infinite
C. ccs
D. 2*ccs
Answer» B. infinite
Discussion
27.

For a cascode stage, with input applied to the C.B. stage, the input capacitance gets multiplied by a factor of

A. 0
B. 1
C. 3
D. 2
Answer» E.
Discussion
28.

Ignoring early effect, if C1 is the total capacitance tied to the emitter, what is the input pole of a simple C.B. stage?

A. 1/gm * c1
B. 2/gm * c1
C. gm * c1
D. gm * 2c1
Answer» B. 2/gm * c1
Discussion
29.

During high frequency applications of a B.J.T., which of the following three stages do not get affected by Miller’s approximation?

A. c.e.
B. c.b.
C. c.c.
D. follower
Answer» C. c.c.
Discussion
30.

In CE arrangement, the value of input impedance is approximately equal to

A. hie
B. hib
C. hoe
D. hre
Answer» B. hib
Discussion
31.

How many h-parameters of a transistor are dimensionless?

A. four
B. two
C. three
D. one
Answer» C. three
Discussion
32.

The values of h-parameters of a transistor in CE arrangement are                   arrangement.

A. same as for cb
B. same as for cc
C. different from that in cb
D. similar to no
Answer» D. similar to no
Discussion
33.

If the load resistance of a C.E. stage increases by a factor of 2, what happens to the high frequency response?

A. the 3 db roll off occurs faster
B. the 3 db roll off occurs later
C. the input pole shifts towards origin
D. the input pole becomes infinite
Answer» B. the 3 db roll off occurs later
Discussion
34.

If temperature changes, h parameters of a transistor

A. also change
B. does not change
C. remains same
D. may or may not change
Answer» B. does not change
Discussion
35.

The hfe parameter is called                in CE arrangement with output short circuited.

A. voltage gain
B. current gain
C. input impedance
D. output impedance
Answer» C. input impedance
Discussion
36.

What happens to the h parameters of a transistor when the operating point of the transistor changes?

A. it also changes
B. does not change
C. may or may not change
D. nothing happens
Answer» B. does not change
Discussion
37.

The dimensions of hie parameters are

A. mho
B. ohm
C. farad
D. ampere
Answer» C. farad
Discussion
38.

How many h-parameters are there for a transistor?

A. two
B. three
C. four
D. five
Answer» D. five
Discussion
39.

For what type of signals does a transistor behaves as linear device?

A. small signals only
B. large signals only
C. both large and small signal
D. no signal
Answer» B. large signals only
Discussion
40.

What is the current flowing through the R1 resistor for voltage divider (R1=R2=1KΩ, VDD=10V)?

A. 5ma
B. 3ma
C. 1ma
D. 2ma
Answer» B. 3ma
Discussion
41.

The h-parameters analysis gives correct results for

A. large signals only
B. small signals only
C. both large and small
D. not large nor small signals
Answer» C. both large and small
Discussion
42.

What will happen if values of Rs increase?

A. vgs increases
B. vgs decreases
C. vgs remains the same
D. vgs=0
Answer» C. vgs remains the same
Discussion
43.

Find the gate to source voltage for voltage divider having R1=R2=2KΩ and VDD=12V, ID=1mA and RS=4KΩ?

A. 3v
B. 2v
C. 0v
D. 1v
Answer» C. 0v
Discussion
44.

Find the gate voltage for voltage divider having R1=R2=1KΩ and VDD=5V?

A. 1v
B. 5v
C. 3v
D. 2.5v
Answer» E.
Discussion
45.

For a self-bias circuit, find drain to source voltage if VDD=12V, ID=1mA, Rs=RD=1KΩ?

A. 1v
B. 2v
C. 10v
D. 5v
Answer» D. 5v
Discussion
46.

Which of the following equation brings the relation between gate to source voltage and drain current in Self Bias?

A. vgs=vdd
B. vgs=-id rs
C. vgs=0
D. vgs=1+id rs
Answer» C. vgs=0
Discussion
47.

For a fixed bias circuit the drain current was 1mA, VDD=12V, determine drain resistance required if VDS=10V?

A. 1kΩ
B. 1.5kΩ
C. 2kΩ
D. 4kΩ
Answer» D. 4kΩ
Discussion
48.

For a fixed bias circuit the drain current was 1mA, what is the value of source current?

A. 0ma
B. 1ma
C. 2ma
D. 3ma
Answer» D. 3ma
Discussion
49.

Which of the following relation is true about gate current?

A. ig=id+is
B. id=ig
C. is= ig
D. ig=0
Answer» E.
Discussion
50.

Consider the following circuit. Given that VDD = 15V, VP = 2V, and IDS = 3mA, to bias the circuit properly, select the proper statement.

A. rd < 6kΩ
B. rd > 6kΩ
C. rd > 4kΩ
D. rd < 4kΩ
Answer» B. rd > 6kΩ
Discussion