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.

Electronic Systems and Technologies - Trial Practice

What is a two-wire circuit?
A circuit usually in the subscriber loop, between the telephone set and the local central office.
A circuit having only two terminals, both terminals having the same instantaneous voltage.
A circuit consisting of two transmission lines.
A circuit with one input terminal, one output terminal, and a common ground.
Show Solution
Question:
What is a two-wire circuit?
Answer:

A circuit usually in the subscriber loop, between the telephone set and the local central office.

If two FM signals of different strengths are received on the same frequency
one steady heterodyne will appear in the AF output
neither signal will be intelligence unless the weaker signal is at least 10 times
both will appear in the AF output
only the stronger will appear in the AF output
Show Solution
Question:
If two FM signals of different strengths are received on the same frequency
Answer:

only the stronger will appear in the AF output

ITFS means
Instructional Telephone Frequency Service
Instructional Television Fixed Service
International Television Frequency Standard
International Telecommunications Frequency Standard
Show Solution
Question:
ITFS means
Answer:

Instructional Television Fixed Service

IXC means
Inter-Exchange Carrier
none of these
International Exchange Carriers
International Exchange Center
Show Solution
Question:
IXC means
Answer:

Inter-Exchange Carrier

The round-trip propagation delay between two earth stations through a geosynchronous satellite is
500 to 600 ms
400 to 500 ms
300 to 400 ms
600 to 700 ms
Show Solution
Question:
The round-trip propagation delay between two earth stations through a geosynchronous satellite is
Answer:

500 to 600 ms

In a capacitive type, reactance-tube modulator connected across in oscillator tuned circuit, a more negative voltage on the grid of the reactance tube will cause
a decrease of oscillator frequency
an increase of the oscillator frequency
an increase of the reactance-tube capacitance
an increase of the reactance tube, ac plate current
Show Solution
Question:
In a capacitive type, reactance-tube modulator connected across in oscillator tuned circuit, a more negative voltage on the grid of the reactance tube will cause
Answer:

an increase of the oscillator frequency

How many levels can be represented in PCM transmission system if the binary numbers 00000000 to 11111111 are used to represent signal levels?
64
256
128
512
Show Solution
Question:
How many levels can be represented in PCM transmission system if the binary numbers 00000000 to 11111111 are used to represent signal levels?
Answer:

256

A light ray enters one medium from another along the normal. The angle of refraction is
equal the critical angle
90 degrees
dependent on the indexes of refraction of the two media
0
Show Solution
Question:
A light ray enters one medium from another along the normal. The angle of refraction is
Answer:

dependent on the indexes of refraction of the two media

When a line and a load are match the reflection coefficient is
positive infinity
negative infinity
zero
unity
Show Solution
Question:
When a line and a load are match the reflection coefficient is
Answer:

zero

A certain machine with a slightly out-of balance motor rotating at 1800/min is fixed on a perfectly elastic mount with a static compression of 2.50 mm. Calculate the resonant frequency of mount.
10 Hz
20 Hz
40 Hz
30 Hz
Show Solution
Question:
A certain machine with a slightly out-of balance motor rotating at 1800/min is fixed on a perfectly elastic mount with a static compression of 2.50 mm. Calculate the resonant frequency of mount.
Answer:

10 Hz

High-power TWTs are replacing what in microwave amplifiers?
klystrons
IMPATT diodes
magnetrons
MESFETs
Show Solution
Question:
High-power TWTs are replacing what in microwave amplifiers?
Answer:

klystrons

which has the lowest luminance?
green
cyan
magenta
blue
Show Solution
Question:
which has the lowest luminance?
Answer:

blue

The number of transmit/receive channels in the cellular system is
655
645
625
666
Show Solution
Question:
The number of transmit/receive channels in the cellular system is
Answer:

666

What is the horizontal synchronous / blanking pulse rate?
15.75 kHz
30 Hz
60 Hz
120 Hz
Show Solution
Question:
What is the horizontal synchronous / blanking pulse rate?
Answer:

15.75 kHz

The numerical aperture of a fiber if the angle of acceptance is 15 degrees, is
0.17
0.75
0.5
0.26
Show Solution
Question:
The numerical aperture of a fiber if the angle of acceptance is 15 degrees, is
Answer:

0.26

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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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