Electronic Circuits Practice Quiz 07

Electronic Circuits Practice Quiz 07

Welcome to ECE Board Exam Practice Quiz for Electronic Circuits. This set of practice quiz 7 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.

A buffer amplifier is used for
Maximum loading and minimum mismatch
Minimum loading and minimum mismatch
Maximum loading and maximum mismatch
Minimum loading and maximum mismatch

Correct!

Wrong!

Which operation gives the maximum distortion?
Class A
Class C
Class B
Class AB

Correct!

Wrong!

The stability of a regulated power supply is equivalent to
change of output voltage over the change in supply voltage
change in supply voltage over the change of output voltage
product of the output voltage and supply voltage
the difference of an output voltage to its supply voltage

Correct!

Wrong!

What is the maximum collector efficiency of class B?
50%
90%
60.5%
78.5%

Correct!

Wrong!

What type of oscillator which is composed of one or more amplifying devices with some frequency determining networks introducing positive feedback at a particular frequency so that oscillation is sustained at that frequency?
Sine wave oscillator
Square-wave generator
Relaxation oscillator
Limiter

Correct!

Wrong!

The power input to a power amplifier is ______ quantity.
ac
Pulsating dc
dc
sinusoidal

Correct!

Wrong!

The frequency of the ripple voltage at the output of a full-wave rectifier at 60 cycles.
120 cycles
60 cycles
240 cycles
480 cycles

Correct!

Wrong!

The operating point in a transistor amplifier moves along ______ when an ac signal is applied.
dc load line
ac load line
both dc and ac load lines
cut-off

Correct!

Wrong!

Class B operation has a maximum possible frequency of ______ percent.
100%
78.5%
75%
2.2%

Correct!

Wrong!

In an LC circuit, when the capacitor energy is maximum, the inductor energy is
Maximum
Minimum
Half-way between maximum and minimum
Zero

Correct!

Wrong!

To sustain oscillations, the power gain of the amplifier may be
Between 0.1 and 0.5
Any value form 0.5 upward
Equal to or greater than 1
Infinite

Correct!

Wrong!

If you move towards an oscillating circuit, its frequency changes because of
Hand capacitance
Movement of the body
Noise of foot
Stray capacitance

Correct!

Wrong!

In an LC oscillator, if the value of L is increased four times, then the frequency of oscillation is
Decreased 2 times
Decreased 4 times
Increased 2 times
Increased 4 times

Correct!

Wrong!

The output signal of CE amplifier is always
Out of phase with the input signal
Equal to the input signal
In phase with the input signal
Larger than the input signal

Correct!

Wrong!

Which is a fixed-frequency oscillator
Phase-shift oscillator
Colpitt’s oscillator
Hartley oscillator
Crystal oscillator

Correct!

Wrong!

Which of the following is NOT an oscillator requirement?
Attenuator
Amplifier
Tank circuit
Feedback

Correct!

Wrong!

Which of the following amplifier below is a choice when higher power gain is a requirement?
Common base
Common emitter
Common collector
Hybrid connection

Correct!

Wrong!

Feedback circuit usually employs _______ network
Resistive
Inductive
Capacitive
Active

Correct!

Wrong!

In a Colpitt’s oscillator, feedback is obtained
By magnetic induction
By a tickler coil
From the center of split capacitors
From the center of split inductors

Correct!

Wrong!

In an LC oscillator, the frequency of oscillations is given by

 
1/(2π√LC)
√LC/2π
√LC/2π
π/√LC

Correct!

Wrong!

Quartz crystal is most commonly used in crystal oscillators because.
It is easily available
It has superior electrical properties
It is quite inexpensive
It is very rugged

Correct!

Wrong!

What is the phase difference between the output and the input voltage of a CE amplifier?
180°
270°

90°

Correct!

Wrong!

The number of transistor in a single stage amplifier is
Two
Three
One
Four

Correct!

Wrong!

What is the phase difference between voltage across collector load and signal voltage in a common emitter amplifier?

270°
180°
90°

Correct!

Wrong!

One of the items below is a characteristic of cascaded amplifiers?
Doubles transconductance
Total gain is lessen
Increased overall gain
Increased overall amplification ratio

Correct!

Wrong!

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