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Online Digital Electronics Test - Digital Electronics Test - Random

Instruction:
  • This is a FREE online test. Beware of scammers who ask for money to attend this test.
  • Total number of questions: 20.
  • Time allotted: 30 minutes.
  • Each question carries 1 mark; there are no negative marks.
  • DO NOT refresh the page.
  • All the best!

Marks : 2/20

Total number of questions
20
Number of answered questions
0
Number of unanswered questions
20
Test Review : View answers and explanation for this test.
1.
Convert 73116 to decimal.
216.4
985
3D9
1841
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Learn more problems on : Number Systems and Codes
2.
Which of the following is the primary advantage of using the BCD code instead of straight binary coding?
Fewer bits are required to represent a decimal number with the BCD code.
The relative ease of converting to and from decimal.
BCD codes are easily converted to hexadecimal codes.
BCD codes are easily converted to straight binary codes.
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Correct Answer: Option
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Learn more problems on : Number Systems and Codes
3.
The column weight of the "1" in the hexadecimal number 1AB is ________.
64
256
512
1024
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Learn more problems on : Number Systems and Codes
4.
What is the primary motivation for using Boolean algebra to simplify logic expressions?
It may make it easier to understand the overall function of the circuit.
It may reduce the number of gates.
It may reduce the number of inputs required.
all of the above
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Learn more problems on : Boolean Algebra and Logic Simplification
5.
To implement the expression , it takes one OR gate and ________.
three AND gates and three inverters
three AND gates and four inverters
three AND gates
one AND gate
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Learn more problems on : Combinational Logic Analysis
6.
In true sum-of-products expressions, the inversion signs cannot cover more than single variables in a term.
True
False
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Learn more problems on : Combinational Logic Circuits
7.
A circuit that can convert one of ten numerical keys pressed on a keyboard to BCD is a ________.
priority encoder
decoder
multiplexer
demultiplexer
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Learn more problems on : Combinational Logic Circuits
8.
If an input is activated by a signal transition, it is ________.
hair-triggered
line-triggered
pulse-triggered
edge-triggered
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Learn more problems on : Flip-Flops
9.
Which of the following procedures could be used to check the parallel loading feature of a counter?
Preset the LOAD inputs, set the CLR to its active level, and check to see that the Q outputs match the values preset into the LOAD inputs.
Apply LOWs to the parallel DATA inputs, pulse the CLK input, and check for LOWs on all the Q outputs.
Apply HIGHs to all the DATA inputs, pulse the CLK and CLR inputs, and check to be sure that the Q outputs are all LOW.
Apply HIGHs to all the Q terminals, pulse the CLK, and check to see if the DATA terminals now match the Q outputs.
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Learn more problems on : Counters
10.
A glitch that appears on the decoded output of a ripple counter is often difficult to see on an oscilloscope because ________.
it is a random event
it occurs less frequently than the normal decoded output
it is very fast
all of the above
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Learn more problems on : Counters
11.
EEPROM and Flash memory are electrically erasable.
True
False
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Learn more problems on : Memory and Storage
12.
Each programmable array logic (PAL) gate product is applied to an OR gate and, if combinational logic is desired, the product is ORed and then:
the polarity fuse is restored
sent to an inverter for output
sent immediately to an output pin
passed to the AND function for output
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Learn more problems on : Programmable Logic Device
13.
Which of the figures in figure (a to d) is equivalent to figure (e)?

a
b
c
d
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Learn more problems on : Describing Logic Circuits
14.
The comments in ADHL are enclosed between # characters.
True
False
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Learn more problems on : Describing Logic Circuits
15.
Subtract the following hexadecimal numbers.
47   34   FA
–25   –1C   –2F
22    18    CB
22    17    CB
22    19    CB
22    18    CC
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Learn more problems on : Digital Arithmetic Operations and Circuits
16.

Convert each of the decimal numbers to 8-bit two's-complement form and then perform subtraction by taking the two's-complement and adding.

0001  0011
0000  1110
0010  1110
1110  0000
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Learn more problems on : Digital Arithmetic Operations and Circuits
17.
The data sheet for the 74 series of TTL ICs shows that Vcc has a range of 4.5 V to 5.5 V.
True
False
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Learn more problems on : Integrated-Circuit Logic Families
18.
Power-supply decoupling uses a radio-frequency capacitor to short out high frequency spikes.
True
False
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Learn more problems on : Integrated-Circuit Logic Families
19.
The noise margin for TTL is 0.8 V.
True
False
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Learn more problems on : Integrated-Circuit Logic Families
20.
What is the resolution, in percent, of a 12-bit DAC?
8.33
0.049
0.000488
0.083
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Learn more problems on : Interfacing to the Analog World
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