# Transistor Difference Amplifiers MCQ’s

This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Transistor Difference Amplifiers”.

1. What is the problem with a single operational difference amplifier?
a) High input resistance
b) Low input resistance
c) Low output resistance
d) High output resistance

2. What is the total voltage gain of a difference amplifier if the gain of first stage is 4.8 and the gain of the second stage is 1.2?
a) 6.75
b) 6.55
c) 5.76
d) 5.65

3. What is the voltage gain of a differential amplifier is all amplifier values are equal?
a) 1
b) 0
c) ∞
d) Cannot be determined

4. What is the total voltage gain of a difference amplifier if input of first stage is 50V and the output of the second stage is 100V?
a) 20
b) 0.2
c) 2.5
d) 2

5. How do we calculate the output voltage of a difference amplifier?
a) VO = -Ad × Vd + AC × VC
b) VO = -Ad × Vd – AC × VC
c) VO = Ad × Vd + AC × VC
d) VO = Ad × Vd – AC × VC

6. How many methods of coupling are used for a difference amplifier?
a) 3
b) 4
c) 2
d) 5

7. How is the voltage gain measured in a difference amplifier?
a) Volts
b) Ampere
c) Decibels
d) Dimensionless

8. What is the purpose of using a difference amplifier?
a) Increase voltage gain
b) Decrease voltage gain
c) Increase current gain
d) Decrease current gain

9. What is the total voltage gain of a difference amplifier if the gain of first stage is 10dB, gain of the second stage is 20dB and gain of third stage is 30dB?
a) 60.32dB
b) 50dB
c) 60dB
d) 50.32dB

10. The coupling device is essential for a difference amplifier.
a) True
b) False

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