BIRLA INSTITUTE OF TECHNOLOGY AND SCIENCE PILANI, Hyderabad Campus
Second Semester 2022-2023
ECE F341/EEE F341/INSTR F341: Analog Electronics
Quiz-1
Time-: 30 Min
Max Marks-:10
Date: 21-02-2023
Name:
ID. No:
Instructions: - There are five questions. Read the questions carefully and write the answers in the space provided.
Every correct answer carries 2 marks while every incorrect answer carries -0.5 mark. Answer all the questions.
Rough work must be carried out on the supplementary sheet provided separately. Both question paper as well as the
answer sheet must be submitted for evaluation. Overwriting or ambiguity will not be considered for evaluation.
Answers
1
2
3
4
5
A
C
C
D
D
1. Differential amplifier shown in Figure-1 uses a transistor with β = 100, biased at ICQ = 100 µA. Determine
RC and RE if |Ad| = 200 and CMRR = 80 dB. Use VT = 25 mV.
(A) RC = 50 kΩ; RE = 1.25 MΩ
(B) RC = 50 kΩ; RE = 125 kΩ
(C) RC = 25 kΩ; RE = 1.25 MΩ
(D) RC = 25 kΩ; RE = 125 kΩ
2. In the Inverting amplifier shown in Figure-2, V = sin (2 ∗ π ∗ 1000 ∗ t) V. If open-loop gain of opamp
(AOL) = 100, Rf =10 kΩ, R1=10 kΩ, then what is V0?
(A) −9 sin (2 ∗ π ∗ 1000 ∗ t) V
(B) 0.98 cos (2 ∗ π ∗ 1000 ∗ t) V
(C) − 0.98 sin (2 ∗ π ∗ 1000 ∗ t) V
(D) − sin (2 ∗ π ∗ 1000 ∗ t) V
Figure-1
Figure-2
3. Find VO for the circuit shown in Figure-3, if R1 = 1 kΩ, R2 = 1 kΩ, RF1 = 2 kΩ, RF2 = 4 kΩ, V1 = 3 V and
V2 = 1 V.
(A) 2 V
(B) 4 V
(C) 6 V
(D) 8 V
Figure-3
4. Find the correct expression of
(A) −
for the circuit shown in Figure-4.
(B) −
(C) −
(D) −
Figure-4
5. The circuit shown in Figure-5 is an instrumention amplifier. Determine the range over which its gain can
be varied if potentiometer (Rpot) is varied over its entire range 0 to 100 kΩ. Given, R1 = 100 kΩ,
R2 = 100 Ω, R3 = 200 Ω, R4 = 100 Ω.
(A) 2.5 to 100.5
(B) 2.5 to 1000.5
(C) 1.5 to 100.5
Figure-5
(D) 1.5 to 1000.5
BIRLA INSTITUTE OF TECHNOLOGY AND SCIENCE PILANI, Hyderabad Campus
Second Semester 2022-2023
ECE F341/EEE F341/INSTR F341: Analog Electronics
Quiz-1
Time-: 30 Min
Max Marks-:10
Date: 21-02-2023
Name:
ID. No:
Instructions: - There are five questions. Read the questions carefully and write the answers in the space provided.
Every correct answer carries 2 marks while every incorrect answer carries -0.5 mark. Answer all the questions.
Rough work must be carried out on the supplementary sheet provided separately. Both question paper as well as the
answer sheet must be submitted for evaluation. Overwriting or ambiguity will not be considered for evaluation.
Answers
1
2
3
4
5
B
A
D
C
C
1. Differential amplifier shown in Figure-1 uses a transistor with β = 100, biased at ICQ = 100 µA. Determine
RC and RE if |Ad| = 200 and CMRR = 60 dB. Use VT = 25 mV.
(A) RC = 50 kΩ; RE = 1.25 MΩ
(B) RC = 50 kΩ; RE = 125 kΩ
(C) RC = 25 kΩ; RE = 1.25 MΩ
(D) RC = 25 kΩ; RE = 125 kΩ
2. In the Inverting amplifier shown in Figure-2, V = sin (2 ∗ π ∗ 1000 ∗ t) V. If open-loop gain of opamp
(AOL) = 100, Rf =10 kΩ, R1=1 kΩ, then what is V0?
(A) − 9 sin (2 ∗ π ∗ 1000 ∗ t) V
(B) 0.98 cos (2 ∗ π ∗ 1000 ∗ t) V
(C) − 0.98 sin (2 ∗ π ∗ 1000 ∗ t) V
(D) − 10 sin (2 ∗ π ∗ 1000 ∗ t) V
Figure-1
Figure-2
3. Find VO for the circuit shown in Figure-3, if R1 = 1 kΩ, R2 = 1 kΩ, RF1 = 2 kΩ, RF2 = 3 kΩ, V1 = 3 V and
V2 = 2 V.
(A) 8 V
(B) 6 V
(C) 4 V
(D) 2 V
Figure-3
4. Find the correct expression of
(A) −
for the circuit shown in Figure-4.
(B) −
(C) −
(D) −
Figure-4
5. The circuit shown in Figure-5 is an instrumention amplifier. Determine the range over which its gain can
be varied if potentiometer (Rpot) is varied over its entire range 0 to 10 kΩ. Given, R1 = 100 kΩ,
R2 = 100 Ω, R3 = 200 Ω, R4 = 100 Ω.
(A) 2.5 to 100.5
(B) 2.5 to 1000.5
(C) 1.5 to 100.5
Figure-5
(D) 1.5 to 1000.5