Welcome to ECE Board Exam Practice Quiz for Electronic Circuits. This set of practice quiz 8 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 07
Emitter follower is used for
Impedance matching
Voltage gain
Current gain
Power gain
Correct!
Wrong!
Parasitic oscillations are caused by
Output negative feedback
Push-pull operation
Poor interstage coupling
Transistor interelectrode capacitance
Correct!
Wrong!
In a phase shift oscillator, 180° phase-shift is obtained
A transformer
LC tank circuit
Three RC sections
Three LC sections
Correct!
Wrong!
The operating frequency of a Wien-bridge oscillator is given by
1/(2π√LC)
1/(2πRC)
1/(4πLC)
1/(29RC)
Correct!
Wrong!
When a transistor is cut off
Maximum current flows
Maximum voltage appears across load
Maximum voltage appears across transistor
Minimum current flows
Correct!
Wrong!
When shock-excited, a crystal will produce alternating emf longer than an LC circuit because
has greater mechanical strength
has fewer losses
is small-sized
is very rigid
Correct!
Wrong!
What oscillator circuit uses a tapped coil in the tuned circuit?
Hartley
Colpitts
Crystal
Pierce
Correct!
Wrong!
Series current negative feedback occurs when the feedback voltage is proportional to the output
Voltage
Impedance
Current
Power
Correct!
Wrong!
An amplifier with efficiency of 85% is likely to be
Class A
Class B
Class AB
Class C
Correct!
Wrong!
What is the desired input impedance of a transistor?
Low
Very low
High
Very high
Correct!
Wrong!
Class A operation has a maximum possible efficiency of _______ percent.
100%
50%
75%
25%
Correct!
Wrong!
The approximate operating frequency of a phase shift oscillator is given by
1/(2π√LC)
1/(2πRC√6)
1/(2πRC)
1/(29RC)
Correct!
Wrong!
An oscillator converts
ac power into dc power
dc power into ac power
mechanical power into ac power
electrical power into mechanical power
Correct!
Wrong!
A class A power amplifier is otherwise known as
Single ended amplifier
Darlington amplifier
Symmetrical amplifier
Differential amplifier
Correct!
Wrong!
Which of the following is not a FET amplifier configuration?
Common base amplifier
Common drain amplifier
Common source amplifier
Common gate amplifier
Correct!
Wrong!
When the collector resistor in a common emitter amplifier is increased in value the voltage gain.
Increases
Decreases
Remain the same
Becomes erratic
Correct!
Wrong!
Class C operation is preferred in oscillators because it
Is more efficient
Gives larger outputs
Produces square waves
Increases stability
Correct!
Wrong!
What is the most stable sine-wave oscillator which uses piezo-electric quartz crystal?
Crystal oscillator
Wien-bridge oscillator
DC restorer
Hartley and Colpitts oscillator
Correct!
Wrong!
Cascaded amplifiers total decibel gain is equal to
The sum of the individual gains
The product of the individual gains
The difference of the individual gains
The quotient of the individual gains
Correct!
Wrong!
Low efficiency of a power amplifier results in
Low forward bias
Less battery consumption
More battery consumption
Low power output
Correct!
Wrong!
When CE configuration is used for an oscillator, the voltage fed back must
Be inverted by 180°
Be taken from a capacitor
Have a 0° phase shift
Taken from an inductor
Correct!
Wrong!
What is the purpose of capacitors in a transistor amplifier?
To protect the transistor
To cool the transistor
To couple or bypass ac component
To provide biasing
Correct!
Wrong!
The signal generator generally used in laboratories is ________ oscillator.
Crystal
Wien-bridge
Hartley
Phase-shift
Correct!
Wrong!
Logic analyzer is used to
Verify the logic operation of the gates in a circuit
To display the fall time
To sample and display systems signal
To analyze the logic operation of the system
Correct!
Wrong!
What is the approximate gain of an amplifier with negative feedback?
The feedback factor
The reciprocal of feedback factor plus one
The reciprocal of feedback factor
The feedback factor plus one
Correct!
Wrong!
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Electronic Circuits – Quiz 08
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