Welcome to ECE Board Exam Practice Quiz for Electronic Circuits. This set of practice quiz 5 will test your competence on the theories, concepts and problem solving involving Electronic Circuits. The objectives and goals of this quiz is to help engineering students familiarize concepts and theories as well as develop problem solving skills when answering questions related to the Electronic Circuits.
Electronic Circuits Test Bank
In this section are compiled practice quiz for Electronic Circuits that could be able to enhance your knowledge and skills in your preparation for the ECE Board Exam. The goal is to add thousands of questions for you to be familiarized and hopefully help you to be prepared. I am looking forward that this practice quiz will give you an additional confidence in taking your upcoming Engineering Board Exam.
Guidelines:
- Read and understand each question before choosing the best answer.
- The correct answer will be reveal after you have chosen your answer for every questions
- There is no time limit, answer the questions at your own pace.
- Once all questions are answered, you will be shown your rating.
- You have to get 70% of the total items to pass the quiz.
- You can re-take the quiz as many times as you want or until you are satisfied of your rating.
- Comment us your thoughts, scores, ratings, and questions about the quiz in the comments section below!
Choose the letter of the best answer in each questions.
PREVIOUS: Electronic Circuits Practice Quiz 04
The gain of an amplifier is expressed in dB unit because
It is a simple unit
Calculations become easy
Human ear response is logarithmic
It is the most appropriate unit
Correct!
Wrong!
What is the main consideration in the output stage of an amplifier?
Power output
Voltage gain
Power gain
Current gain
Correct!
Wrong!
When negative voltage feedback is applied to an amplifier, its output impedance
Remains unchanged
Decreases
Increases
Becomes zero
Correct!
Wrong!
In phase-shift oscillator, what are the frequency determining elements?
L and C
R, L and C
R and C
R and L
Correct!
Wrong!
The bandwidth of an amplifier _________ when negative feedback is applied.
Decreases
Remains unchanged
Becomes infinite
Increases
Correct!
Wrong!
When crystal frequency increases with temperature, it has ________ temperature co- efficient.
Positive
Negative
Zero
Infinite
Correct!
Wrong!
When the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, feedback factor is
10
0.1
0.01
0.15
Correct!
Wrong!
The input resistance of a common emitter amplifier is affected by
Re, re and β
Rc and re
β and re
α and re
Correct!
Wrong!
A transistor converts
Dc power into ac power
Ac power into dc power
High resistance into low resistance
Low resistance into high resistance
Correct!
Wrong!
The gain of an amplifier with feedback is known as _______ gain.
Closed loop
Resonant
Open loop
Unity
Correct!
Wrong!
For a constant output frequency, the simplest sinusoidal oscillator is the ________.
Crystal oscillator
Phase-shift circuit
Colpitts circuits
Hartley circuit
Correct!
Wrong!
Emitter follower employs _________ negative feedback.
50%
25%
75%
100%
Correct!
Wrong!
The three amplifiers are connected in a multistage arrangement each with a voltage gain of 30. Compute for the overall voltage gain.
90
27,000
10
30
Correct!
Wrong!
What is usually employed at the output stage of an amplifier?
Class A power amplifier
Push-pull amplifier
Pre-amplifier
Differential amplifier
Correct!
Wrong!
What is the axis that connects the corners of a crystal?
X
Mechanical
Y
Z
Correct!
Wrong!
Transformer coupling introduces what type of distortion?
Amplitude
Frequency
Phase
Intermodulation
Correct!
Wrong!
In a multistage amplifier, if the stages have R and C component only, ________ operation is apparent.
Class B
Class C
Class A
Class AB
Correct!
Wrong!
What is the disadvantage of impedance matching?
It gives distorted output
It requires a transformer
It gives low power output
It is expensive
Correct!
Wrong!
An emitter follower is equivalent to
Common emitter amplifier
Common collector amplifier
Common base amplifier
Hybrid connection
Correct!
Wrong!
An important limitation of crystal oscillator is
Its low output
Its high Q
Less availability of quartz crystal
Its high output
Correct!
Wrong!
Which of the items below is not a description of the two-stage amplifier?
The input resistance is equal to the input resistance of the first stage unless feedback is applied
Its output resistance is equal to the output resistance of the final stage unless feedback is applied
Its noise level is equal to the accumulated noise of the two stages, either by multiplying the noise voltage amplitudes together or by adding the noise decibel levels together
The output resistance is equal to the output resistance of the first stage unless feedback is applied.
Correct!
Wrong!
What is the most important consideration in power amplifiers?
Collector efficiency
Biasing the circuit
To keep the transformer cool
Amplifier distortion
Correct!
Wrong!
A tuned amplifier is used in what application?
Radio frequency
Audio frequency
Intermediate frequency
Low frequency
Correct!
Wrong!
An oscillator oscillates due to
Negative feedback
Positive feedback
Both positive and negative feedback
Neither positive nor negative feedback
Correct!
Wrong!
The input impedance of which amplifier depends strongly on load resistance?
CE
CC
CB
CD
Correct!
Wrong!
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Electronic Circuits – Quiz 05
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