Quiz: Electrical Engineering 29 May 2021

Quiz: Electrical Engineering
Exam: DFCCIL
Topic: Amplifiers

Each question carries 1 mark.
Negative marking: 1/4 mark
Time: 10 Minute

Q1. Which of the following circuit is known as the emitter follower?
(a) CC amplifier
(b) CB amplifier
(c) CE amplifier
(d) CS amplifier

Q2. In common collector (CC) configuration, there is…
(a) High voltage gain
(b) High current gain
(c) High output impedance
(d) Low input impedance

Q3. Common emitter is characterized by:
(a) Moderate power gain
(b) Very high output impedance
(c) Low voltage gain
(d) Signal phase reversal

Q4. The input impedance of an ideal voltage amplifier is:
(a) Unity
(b) Infinity
(c) Zero
(d) All of the above

Q5. The … configuration of a transistor offers a phase reversal between I/P and O/P?
(a) Common collector
(b) Common base
(c) Common emitter
(d) None of the above

Q6. In case of class A amplifiers, the ratio of efficiency of transformer coupled amplifier to efficiency of a transformer less amplifier is
(a) 0.5
(b) 1.0
(c) 1.36
(d) 2.0

Q7. In class B power amplifier, output is ………… of the input full cycle:
(a) less than half
(b) half
(c) more than half but less than full
(d) full

Q8. The current gain of a BJT is:
(a) g_m×r_o
(b) g_m/r_O
(c) g_m×r_π
(d) g_m/r_π

Q9. When two amplifier each of bandwidth f_H=10 KHz are cascaded, the overall bandwidth becomes (in KHz)
(a) 10
(b) 6.4
(c) 5
(d) 20

Q10. The purpose of capacitor in a transistor amplifier is to.
(a) To protect the transistor
(b) Cool the transistor
(c) Couple or bypass a.c component
(d) Provide biasing

SOLUTIONS

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