ECE REVIEWER FREE – ELECTRONICS ENGINEERING

Preparing for the Electronics Engineer Licensure Examination (ECE) can be a daunting task, but with the right tools, it becomes more manageable and even enjoyable. One such tool is the LOOKSFAM Board Exam Tool, designed to optimize your study process and help you succeed.

Electronics Engineering

What is the resonant frequency of a circuit when L of 3 microhenrys and C of 40 picofarads are in series?
14.5 kHz
14.5 MHz
145 kHz
145 MHz
Show Solution
Question:
What is the resonant frequency of a circuit when L of 3 microhenrys and C of 40 picofarads are in series?
Answer:

14.5 MHz

What is the approximate efficiency of a large transformer?
95%
50%
65%
80%
Show Solution
Question:
What is the approximate efficiency of a large transformer?
Answer:

95%

Wave attenuation is given as ______________.
e−αx
e-βx
e+βx
e+αx
Show Solution
Question:
Wave attenuation is given as ______________.
Answer:

e−αx

The distance between the capacitor plates increases two times, then its capacitance
decreases two times
increases four times
decreases four times
increases two times
Show Solution
Question:
The distance between the capacitor plates increases two times, then its capacitance
Answer:

decreases two times

What is the typical value of the emitter bypass capacitor Ce in a multistage amplifier?
about 50 µF
about 100 pF
about 0.01 µF
about 0.1 µF
Show Solution
Question:
What is the typical value of the emitter bypass capacitor Ce in a multistage amplifier?
Answer:

about 50 µF

What is the atomic number of copper?
14
1
29
27
Show Solution
Question:
What is the atomic number of copper?
Answer:

29

Explanation:

27"

The maximum reverse voltage that can be applied before current surges is called
maximum junction voltage
reverse recovery time
reverse breakdown voltage
forward voltage
Show Solution
Question:
The maximum reverse voltage that can be applied before current surges is called
Answer:

reverse breakdown voltage

It is needed to translate a high-level program into a sequence of machine instructions that performs the desired task.
assembler
compiler
debugger
interpreter
Show Solution
Question:
It is needed to translate a high-level program into a sequence of machine instructions that performs the desired task.
Answer:

compiler

When CE configuration is used for an oscillator, the voltage fed back must
have a 0 degree phase shift
taken from an inductor
be inverted by 180 degrees
be taken from a capacitor
Show Solution
Question:
When CE configuration is used for an oscillator, the voltage fed back must
Answer:

be inverted by 180 degrees

Which of the following statement is true?
The current in the discharging capacitor decreases constantly
The current in the discharging capacitor decays exponentially
The current in the discharging capacitor grows exponentially
The current in the discharging capacitor grows linearly
Show Solution
Question:
Which of the following statement is true?
Answer:

The current in the discharging capacitor grows exponentially

A storage battery in which the plates consist of lead-antimony supporting grids covered with a lead oxide paste, immersed in weak sulfuric acid.
leclanche cell
primary cell
faure storage battery
secondary battery
Show Solution
Question:
A storage battery in which the plates consist of lead-antimony supporting grids covered with a lead oxide paste, immersed in weak sulfuric acid.
Answer:

faure storage battery

Electric field intensity is a _____ quantity.
scalar
variable
phasor
vector
Show Solution
Question:
Electric field intensity is a _____ quantity.
Answer:

vector

Which of the following is a four-layer diode with an anode gate and a cathode gate?
SUS
SCR
SBS
SCS
Show Solution
Question:
Which of the following is a four-layer diode with an anode gate and a cathode gate?
Answer:

SCS

A capacitance of 0.05 µF equals
0.05 x 10^-6 F
0.05 x 10^-12 F
0.05 x 10^12 F
0.05 x 10^6 F
Show Solution
Question:
A capacitance of 0.05 µF equals
Answer:

0.05 x 10^-6 F

The emission of electrons from hot bodies is called
radiation effect
skin effect
hall effect
Edison effect
Show Solution
Question:
The emission of electrons from hot bodies is called
Answer:

Edison effect

Which of the items below describes an RF amplifier which amplify a weak signal voltage in relatively the same proportion as it will amplify a stronger signal voltage?
Linear amplifier
Class A amplifier
Inverting amplifier
Non-linear amplifier
Show Solution
Question:
Which of the items below describes an RF amplifier which amplify a weak signal voltage in relatively the same proportion as it will amplify a stronger signal voltage?
Answer:

Linear amplifier

If a certain circuit has a current that is lagging the voltage by 45 degrees, then it displays
pure capacitive reactance
resistance and inductive reactance
pure inductive reactance
resistance and capacitive reactance
Show Solution
Question:
If a certain circuit has a current that is lagging the voltage by 45 degrees, then it displays
Answer:

resistance and inductive reactance

Thermal voltage (VT) is approximately equal to _____ at room temperature (20 degrees Celsius).
100 mV
25 V
100 V
25 mV
Show Solution
Question:
Thermal voltage (VT) is approximately equal to _____ at room temperature (20 degrees Celsius).
Answer:

25 mV

What are the three terminals of FET?
gate, source, and drain
plate, cathode, and grid
gate, source, and grid
input, output, and ground
Show Solution
Question:
What are the three terminals of FET?
Answer:

gate, source, and drain

A stand-alone solar power system
needs a full-wave rectifier
relies on the electric utility at night
uses solar panels and batteries
requires the use of dry cells
Show Solution
Question:
A stand-alone solar power system
Answer:

uses solar panels and batteries

The transformer that should never have the secondary open-circuited when primary is energized is
auto transformer
voltage transformer
power transformer
current transformer
Show Solution
Question:
The transformer that should never have the secondary open-circuited when primary is energized is
Answer:

current transformer

Transformer coupling introduces what type of distortion?
frequency
phase
amplitude
intermodulation
Show Solution
Question:
Transformer coupling introduces what type of distortion?
Answer:

frequency

In RC circuits, the time constant indicates the time it takes a capacitor to charge up to what percent of the charging voltage?
0.63
1
0.31
0.67
Show Solution
Question:
In RC circuits, the time constant indicates the time it takes a capacitor to charge up to what percent of the charging voltage?
Answer:

0.63

Explanation:

The time constant of an RC circuit indicates the time it takes for the capacitor to charge up to approximately 63% of the charging voltage.

The output voltage of a thermocouple
remains constant with temperature
increases with applied voltage
increases with temperature
decreases with applied voltage
Show Solution
Question:
The output voltage of a thermocouple
Answer:

increases with temperature

Which of the following is a circuit that continuously alternates between two states without an external clock?
J-K flip-flop
T flip-flop
Monostable multivibrator
Astable multivibrator
Show Solution
Question:
Which of the following is a circuit that continuously alternates between two states without an external clock?
Answer:

Astable multivibrator

Explanation:

This describes a flip-flop circuit, a fundamental component in digital logic circuits.

A method of converting chemical energy into electrical energy by dissolving two different conducting materials in an electrolyte.
voltaic cell
battery
charging
cell
Show Solution
Question:
A method of converting chemical energy into electrical energy by dissolving two different conducting materials in an electrolyte.
Answer:

voltaic cell

Whenever a conductor cuts magnetic flux, an emf is induced in it. This is known as
Faraday's Law
Ohm's Law
Coulomb's Law
Joule's Law
Show Solution
Question:
Whenever a conductor cuts magnetic flux, an emf is induced in it. This is known as
Answer:

Faraday's Law

What emitter is used in X-ray tubes?
nickel
tungsten
thoriated tungsten
oxide-coated
Show Solution
Question:
What emitter is used in X-ray tubes?
Answer:

tungsten

An ideal differential amplifiers common mode rejection ratio is
undetermined
infinite
zero
unity
Show Solution
Question:
An ideal differential amplifiers common mode rejection ratio is
Answer:

infinite

An intermittent and non-symmetrical alternating current like that obtained from the secondary winding of an induction coil.
Inductive current
Capacitive current
Transient ac current
Faradic current
Show Solution
Question:
An intermittent and non-symmetrical alternating current like that obtained from the secondary winding of an induction coil.
Answer:

Faradic current

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Good luck to all future electronics engineers! If you have any specific questions or need further assistance, feel free to ask.

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