Welcome to ECE Board Exam Practice Quiz for Electronic Circuits. This set of practice quiz 10 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.
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Choose the letter of the best answer in each questions.
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CC configuration is used for impedance matching because its
Input impedance is very high
Input impedance is very low
Output impedance is very low
Output impedance is zero
Correct!
Wrong!
Power amplifiers generally use transformer coupling because transformer coupling provides
Cooling of the circuit
Distortionless output
Impedance matching
Good frequency response
Correct!
Wrong!
The frequency response of the combined amplifier can be compared with
An OR gate
A negative feedback amplifier
A positive filter
An AND gate
Correct!
Wrong!
Calculate the ripples of the filter output if a dc and ac voltmeter is used and measures the output signal from a filter circuit of 25 VDC and 1.5 Vrms
5%
10%
50%
6%
Correct!
Wrong!
Consider a zener diode with a slope resistance of 10 Ω in series with a 90 Ω resistor fed from a dc supply containing a ripple voltage of 20 mV peak-to-peak. Compute for the ripple voltage in load
1 mV p-p
2 mV p-p
1 V p-p
6 mV p-p
Correct!
Wrong!
A common emitter circuit is also called ________ circuit.
Grounded emitter
Grounded collector
Grounded base
Emitter follower
Correct!
Wrong!
What is the gain of an amplifier with negative feedback if the feedback factor is 0.01?
10
1,000
100
500
Correct!
Wrong!
The current in any branch of a transistor amplifier that is operating is
ac only
the sum of ac and dc
the difference of ac and dc
dc only
Correct!
Wrong!
The ac variations at the output side of power supply circuits are called ________.
Ripples
Pulses
Waves
Filters
Correct!
Wrong!
What is the maximum collector efficiency of a transformer coupled class A power amplifier?
30%
80%
45%
50%
Correct!
Wrong!
Comparatively, power amplifier has ______ β.
Large
Very large
Small
Very small
Correct!
Wrong!
Transformer coupling can be used in ________ amplifiers.
Only power
Only voltage
Either power or voltage
Neither power nor voltage
Correct!
Wrong!
The impedance of a load must match the impedance of the amplifier so that
Minimum power is transferred to the load
The efficiency can be maintained at low level
The signal-to-noise ratio is maximized
Maximum power is transferred to the load
Correct!
Wrong!
The output power of a transistor amplifier is more than the input power due to additional power supplied by
Transistor
Collector supply
Emitter supply
Base supply
Correct!
Wrong!
When amplifiers are cascaded
The gain of each amplifier is increased
A lower supply voltage is required
The overall gain is increased
Each amplifier has to work less
Correct!
Wrong!
The push-pull circuit must use ________ operation.
Class A
Class B
Class C
Class AB
Correct!
Wrong!
When a FET with a lower transconductance is substituted into a FET amplifier circuit, what happens?
The current gain does not change
The voltage gain decreases
The circuit disamplifies
The input resistance decreases
Correct!
Wrong!
The capacitors are considered _________ in the ac equivalent circuit of a transistor amplifier.
Open
Partially open
Short
Partially short
Correct!
Wrong!
What is the most important characteristic of a common collector amplifier?
High input voltage
High input resistance
High output resistance
Its being an amplifier circuit
Correct!
Wrong!
Transmit time is the time taken by the electrons on holes to pass from
Emitter to collector
Collector to emitter
Base to emitter
Base to collector
Correct!
Wrong!
A class A power amplifier uses _______ transistor(s).
Two
One
Three
Four
Correct!
Wrong!
Find the voltage drop developed across a D’ Arsonval meter movement having an internal resistance of 1 kΩ and a full deflection current of 150 uA.
150 µV
150 mV
150 V
200 mV
Correct!
Wrong!
The quiescent current of a FET amplifier is
IDS
id
ID
Id
Correct!
Wrong!
An open fuse circuit has a resistance equal to
Zero
Unity
At least 100 Ω at standard
Infinity
Correct!
Wrong!
When the collector supply is 5 V, then collector cut off voltage under dc condition is
20 V
10 V
2.5 V
5 V
Correct!
Wrong!
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Electronic Circuits – Quiz 10
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