Differential Amplifier and Circuit Configuration MCQ’s

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This set of Linear Integrated Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Differential Amplifier and Circuit Configuration”.

1. 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

2. The value of emitter resistance in Emitter Biased circuit are RE1=25kΩ & RE2=16kΩ. Find RE
a) 9.756kΩ
b) 41kΩ
c) 9.723kΩ
d) 10kΩ

3. A Differential Amplifier should have collector resistor’s value (RC1 & RC2) as
a) 5kΩ, 5kΩ
b) 5Ω, 10kΩ
c) 5Ω, 5kΩ
d) 5kΩ, 10kΩ

4. 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

5. 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

6. An emitter bias Dual Input Balanced Output differential amplifier has VCC=20v, β=100, VBE=0.7v, RE=1.3kΩ. Find IE
a) 7.42mA
b) 9.8mA
c) 10mA
d) 8.6mA

7. 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

8. Find the Single Input Unbalance Output configuration in following circuit diagrams :

Find the unbalance output using single input V1 voltage from the given circuit


Find the unbalance output using two inputs V1 and V2 from given circuit


Find the output using single input V1 which is measured with respect to ground


Find output using two inputs V1 and V2 which are measured at both the collectors


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) 4A

10. 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
d) None of the mentioned

11. 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

12. Find the correct match

ConfigurationVoltage gain and Input resistance
1. Single Input Unbalanced Outputi. Ad = Rc/re , Ri1 Ri2 = 2βacRE
2. Dual Input Balanced Outputii. Ad= Rc/2re , Ri1 Ri2 = 2βacRE
3. Single Input Balanced Outputiii. Ad= Rc/re , Ri = 2βacRE
4. Dual Input Unbalanced Outputiv. Ad = Rc/2re , Ri = 2βacRE

a) 1-i , 2-iii, 3-iv, 4-ii
b) 1-iv, 2-ii, 3-iii, 4-i
c) 1-ii, 2-iv, 3-i , 4-iii
d) 1-iii, 2-i, 3-ii, 4-iv

13. For the circuit shown below, determine the Output voltage (Assume β=5, differential input resistance=12 kΩ)

Determine the output voltage using β and differential input resistance value for the circuit

a) 4.33v
b) 2.33v
c) 3.33v
d) 1.33v

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