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.
A logic circuit that can store one bit of information is a ________.
flip-flop
counter
gate
code converter
Your Answer: Option
(Not Answered)
Correct Answer: Option

2.
Which of the following is an invalid BCD code?
0011
1101
0101
1001
Your Answer: Option
(Not Answered)
Correct Answer: Option

3.
Determine the values of A, B, C, and D that make the product term equal to 1.
A = 0, B = 1, C = 0, D = 1
A = 0, B = 0, C = 0, D = 1
A = 1, B = 1, C = 1, D = 1
A = 0, B = 0, C = 1, D = 0
Your Answer: Option
(Not Answered)
Correct Answer: Option

4.
The Boolean expression C + CD is equal to ________.
C
D
C + D
1
Your Answer: Option
(Not Answered)
Correct Answer: Option

5.
The pulse width of a one-shot circuit is determined by ________.
a resistor and capacitor
two resistors
two capacitors
none of the above
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(Not Answered)
Correct Answer: Option

6.
One example of the use of an S-R flip-flop is as a(n):
racer
astable oscillator
binary storage register
transition pulse generator
Your Answer: Option
(Not Answered)
Correct Answer: Option

7.
A positive edge-triggered flip-flop will accept inputs only when the clock ________.
is LOW
changes from HIGH to LOW
is HIGH
changes from LOW to HIGH
Your Answer: Option
(Not Answered)
Correct Answer: Option

8.
What is the difference between a 7490 and a 7492?
7490 is a MOD-12, 7492 is a MOD-10
7490 is a MOD-12, 7492 is a MOD-16
7490 is a MOD-16, 7492 is a MOD-10
7490 is a MOD-10, 7492 is a MOD-12
Your Answer: Option
(Not Answered)
Correct Answer: Option

9.
By adding recirculating lines to a 4-bit parallel-in, serial-out shift register, it becomes a ________, ________, and ________-out register.
parallel-in, serial, parallel
serial-in, parallel, serial
series-parallel-in, series, parallel
bidirectional in, parallel, series
Your Answer: Option
(Not Answered)
Correct Answer: Option

10.
A 4-bit ring counter is loaded with a single 1. The frequency of any given output is ________.
the same as the clock
twice the clock frequency
one-half the clock frequency
one-fourth the clock frequency
Your Answer: Option
(Not Answered)
Correct Answer: Option

11.
In a register stack, data moves up but not down.
True
False
Your Answer: Option
(Not Answered)
Correct Answer: Option

12.
How many pins are in an EDF10K70 package?
70
140
240
532
Your Answer: Option
(Not Answered)
Correct Answer: Option

13.
Which is a typical application of digital signal processing?
Noise elimination
Music signal processing
Image processing
All of the above
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(Not Answered)
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14.
The flash method of analog-to-digital conversion uses comparators that compare reference voltages with the analog input voltage.
True
False
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(Not Answered)
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15.
Adding in binary, a decimal 26 + 27 will produce a sum of:
111010
110110
110101
101011
Your Answer: Option
(Not Answered)
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16.
What is the major advantage of the R/2R ladder DAC as compared to a binary-weighted-input DAC?
It has fewer parts for the same number of inputs.
It is much easier to analyze its operation.
It uses only two different resistor values.
The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.
Your Answer: Option
(Not Answered)
Correct Answer: Option

17.
When a DAC output shows a deviation of the measured step size from the ideal step size, this error is called nonlinearity.
True
False
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(Not Answered)
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18.
The digit bus and display bus are each just a common set of conductors shared by the digit storage registers and display segments.
True
False
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(Not Answered)
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19.
What is unique about TTL devices such as the 74SXX?
These devices use Schottky transistors and diodes to prevent them from going into saturation; this results in faster turn-on and turn-off times, which translates into higher frequency operation.
The gate transistors are silicon (S), and the gates therefore have lower values of leakage current.
The S denotes the fact that a single gate is present in the IC rather than the usual package of 2–6 gates.
The S denotes a slow version of the device, which is a consequence of its higher power rating.
Your Answer: Option
(Not Answered)
Correct Answer: Option

20.
The devices that provide the means for a computer to communicate with the user or other computers are referred to as:
CPU
ALU
I/O
none of the above
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(Not Answered)
Correct Answer: Option

*** END OF THE TEST ***
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