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

If the number of valence electrons of an atom is exactly 4, then the substance is called
an insulator
a semiconductor
a cryogenic conductor
a conductor
Show Solution
Question:
If the number of valence electrons of an atom is exactly 4, then the substance is called
Answer:

a semiconductor

Class A operation has a maximum possible efficiency of _____ percent
100%
75%
25%
50%
Show Solution
Question:
Class A operation has a maximum possible efficiency of _____ percent
Answer:

50%

The back emf or counter emf in a dc motor
aids the applied voltage
aid the armature current
opposes the armature current
opposes the applied voltage
Show Solution
Question:
The back emf or counter emf in a dc motor
Answer:

opposes the applied voltage

The signal generator generally used in laboratories is _____ oscillator.
phase-shift
Hartley
crystal
Wien-bridge
Show Solution
Question:
The signal generator generally used in laboratories is _____ oscillator.
Answer:

Wien-bridge

What digits are used in the binary number system?
all of the choices
high and low
true and false
0 and 1
Show Solution
Question:
What digits are used in the binary number system?
Answer:

0 and 1

The volt is a unit of
electromotive force
force
energy
magnetomotive force
Show Solution
Question:
The volt is a unit of
Answer:

electromotive force

How many AND gates and 4-bit binary adders are needed to implement a 2-bit to 3-bit binary multiplier?
15 AND gates and three 4-bit binary adders
6 AND gates and one 4-bit binary adder
2 AND gates and one 4-bit binary adder
9 AND gates only
Show Solution
Question:
How many AND gates and 4-bit binary adders are needed to implement a 2-bit to 3-bit binary multiplier?
Answer:

6 AND gates and one 4-bit binary adder

The plate resistance of a tube is mainly due to
space charge
gas in the tube
vacuum in the tube
electrodes of the tube
Show Solution
Question:
The plate resistance of a tube is mainly due to
Answer:

space charge

The most stable sine-wave oscillator which uses piezo-electric quartz crystal.
Wien-bridge oscillator
DC restorer
Crystal oscillator
Hartley and Colpitts oscillator
Show Solution
Question:
The most stable sine-wave oscillator which uses piezo-electric quartz crystal.
Answer:

Crystal oscillator

The voltage output of a cell depends on
electromotive series
its elements
electrochemical series
its electrodes
Show Solution
Question:
The voltage output of a cell depends on
Answer:

its elements

Which is the best type of ammeter movement?
Moving Iron
dynamometer
D'Arsonval
iron-wave
Show Solution
Question:
Which is the best type of ammeter movement?
Answer:

D'Arsonval

Which of the following is a way of decreasing mutual inductance?
increasing the number of turns of either coil
decreasing the number of turns of either coil
moving the coils closer
moving the coils apart
Show Solution
Question:
Which of the following is a way of decreasing mutual inductance?
Answer:

moving the coils apart

What can be used for proper high frequency amplification?
pentode
diode
triode
tetrode
Show Solution
Question:
What can be used for proper high frequency amplification?
Answer:

pentode

If the RC time constant is given to be 1 s, how long will it take for the voltage to drop from 100 V to 50 V?
0.37 s
0.7 s
0.5 s
0.63 s
Show Solution
Question:
If the RC time constant is given to be 1 s, how long will it take for the voltage to drop from 100 V to 50 V?
Answer:

0.63 s

Explanation:

The time constant defines the time taken for the voltage to change by about 63% of its initial value, so it will take approximately 0.63 seconds for the voltage to drop from 100V to 50V.

Comparatively, power amplifier has _____ ß.
small
very small
very large
large
Show Solution
Question:
Comparatively, power amplifier has _____ ß.
Answer:

small

An automatic speed control device using the centrifugal force on rotating flyweights as the feedback element.
regulator
throttle valve
field control
flywheel governor
Show Solution
Question:
An automatic speed control device using the centrifugal force on rotating flyweights as the feedback element.
Answer:

flywheel governor

A type of ground that appears at the inverting input of an op amp that uses negative feedback.
virtual ground
earth ground
equipment ground
true ground
Show Solution
Question:
A type of ground that appears at the inverting input of an op amp that uses negative feedback.
Answer:

virtual ground

The effect of UV radiation that discharges a negatively charged body in a vacuum is called
Joule effect
Joshi effect
Hallwachs effect
Hall Effect
Show Solution
Question:
The effect of UV radiation that discharges a negatively charged body in a vacuum is called
Answer:

Hallwachs effect

Explanation:

The Hallwachs effect refers to UV radiation discharging a negatively charged body in a vacuum.

If the capacitor from emitter to ground in a common emitter amplifier is removed, the voltage gain
increases
decreases
remains the same
becomes erratic
Show Solution
Question:
If the capacitor from emitter to ground in a common emitter amplifier is removed, the voltage gain
Answer:

decreases

Secondary emission effects are undesirable in
I.Cs
transistors
vacuum tubes
gas-filled tubes
Show Solution
Question:
Secondary emission effects are undesirable in
Answer:

vacuum tubes

When the collector resistor in a common emitter amplifier is increased in value the voltage gain
becomes erratic
remains the same
decreases
increases
Show Solution
Question:
When the collector resistor in a common emitter amplifier is increased in value the voltage gain
Answer:

increases

When an atom has bound electrons, it is described as
valence electrons disappear due to vapor
merging of electrons and other particles
all charges do recombination
filled or saturated since valence orbit can hold not more than 8 electrons
Show Solution
Question:
When an atom has bound electrons, it is described as
Answer:

filled or saturated since valence orbit can hold not more than 8 electrons

What is the typical value of the interbase resistance of a UJT?
between 4 to 10 kohm(s)
4 kohm(s)
20 kohm(s)
between 4 to 4 kohm(s)
Show Solution
Question:
What is the typical value of the interbase resistance of a UJT?
Answer:

between 4 to 10 kohm(s)

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
cross over network
hybrid
synthesizer
Show Solution
Question:
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
Answer:

cross over network

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

Saturation in a tube is a condition where an increase in plate voltage will produce
a decrease in electron emission
an appreciable change in plate current
no appreciable change in plate current
a rise in electron emission
Show Solution
Question:
Saturation in a tube is a condition where an increase in plate voltage will produce
Answer:

no appreciable change in plate current

_____ increases the resistance of wire at high frequencies.
skin effect
insulation
temperature
voltage
Show Solution
Question:
_____ increases the resistance of wire at high frequencies.
Answer:

skin effect

Power amplifiers handle _____ signals.
large
small
very small
very large
Show Solution
Question:
Power amplifiers handle _____ signals.
Answer:

large

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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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