Welcome to ECE Board Exam Practice Quiz for Electronic Circuits. This set of practice quiz 4 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.
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Choose the letter of the best answer in each questions.
PREVIOUS: Electronic Circuits Practice Quiz 03
What class of operation has little use in general purpose amplifiers, but is used in high frequency oscillators?
Class A
Class AB
Class B
Class C
Correct!
Wrong!
Which frequency produces the highest noise factor?
10 kHz
500 Hz
1 kHz
100 Hz
Correct!
Wrong!
Feedback factor is always
Less than 1
Equal to 1
More than 1
Zero
Correct!
Wrong!
What class of operation is used either where the signal needs to be cut in half, such as in pulse detector or noise detectors or where push-pull operation of two stages is required?
Class A
Class B
Class AB
Class C
Correct!
Wrong!
Transformer coupling is used for _______ amplification.
Current
Power
Voltage
Signal
Correct!
Wrong!
What oscillator is used on order to produce frequencies in the microwave region?
Wien bridge
Hartley
Klystron
Crystal
Correct!
Wrong!
For constant- K high-pass filter cut-off frequency (in Hz) is given by
π/√LC
π/√LC
1/(4π√LC)
1/(π√LC)
1/(2π√LC)
π/√LC
Correct!
Wrong!
In the initial stages of a multistage amplifier, _________ coupling is used.
Link
RC
Transformer
Impedance
Correct!
Wrong!
An electronic transfer from one stage to the next is termed as _______.
Doping
Mixing
Coupling
Connecting
Correct!
Wrong!
The frequency of oscillation is ________ L and C in an LC oscillator.
Inversely proportional to square root of
Directly proportional to
Independent of the values of
Proportional to square of
Correct!
Wrong!
The general characteristics of a common base amplifier are
High voltage gain, low current gain, high power gain and very low input resistance
High voltage, high current gain, high power gain and low input resistance
Low voltage gain, high current gain, very high power gain and low input resistance
None of the choices
Correct!
Wrong!
A type of filter which is having a single continuous transmission band with neither the upper nor the lower cut-off frequencies being zero or infinite is called
Band stop filter
Low pass filter
High pass filter
Band pass filter
Correct!
Wrong!
If the noise factor of an ideal amplifier expressed in dB, then it is
0
0.1
1
10
Correct!
Wrong!
What coupling provides maximum voltage gain?
RC
Direct
Transformer
Resistor
Correct!
Wrong!
The simplest variable frequency sinusoidal oscillator is the
Complicated Colpitts circuit
Crystal circuit
Armstrong circuit
Phase shift circuit
Correct!
Wrong!
What is the basic purpose of applying negative feedback to an amplifier?
To increase gain
To reduce distortion
To keep the temperature within limits
To increase input signal
Correct!
Wrong!
In order to have more voltage gain from a transformer amplifier the transistor used should have
Thin collector
Thin base
Wide emitter
Thin emitter
Correct!
Wrong!
In transistor amplifiers, what transformer is used for impedance matching?
Step up
Power
Step down
Isolation
Correct!
Wrong!
The efficiency of class AB operation has a maximum of between _________ percent.
90 to 100%
60 to 80%
50 to 78.5%
40.5 to 60%
Correct!
Wrong!
A pair of filter common on high fidelity system which separate audio frequency band signals into two separate groups, where one is fed to the tweeter and the other to the woofer is called
Equalizer
Synthesizer
Cross over network
Hybrid
Correct!
Wrong!
A dc voltage supply provides 60 V when the output is unloaded. When connected to a load the output drops to 56 V. Calculate the value of the voltage regulation.
8.1%
7.1%
5%
12%
Correct!
Wrong!
What is the reason why RC coupling is not used to amplify extremely low frequencies?
There is considerable power loss
Electrical size of coupling capacitor becomes very large
There is a hum in the output
Electrical size of coupling capacitor becomes very small
Correct!
Wrong!
The largest theoretical voltage gain obtained with a common collector amplifier is
100
10
Unity
Infinite
Correct!
Wrong!
The operating point is generally located at __________ of dc load line in class A operation
The middle
Saturation point
Cut off point
End point
Correct!
Wrong!
The driver transformer has center-tapped secondary to provide
Forward bias to transistors of push-pull circuit
Two signals 180 degrees out of phase to transistors of push-pull circuit
Impedance matching
Two signals in phase with each other
Correct!
Wrong!
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Electronic Circuits – Quiz 04
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