Online Digital Electronics Test - Digital Electronics Test 5

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.

The given figure is most likely a ________.

register
decoder
counter
multiplexer
Your Answer: Option
(Not Answered)
Correct Answer: Option

2.
Most computers store binary data in groups of 32 bits called Dwords.
True
False
Your Answer: Option
(Not Answered)
Correct Answer: Option

3.
The truth table for the SOP expression has how many input combinations?
1
2
4
8
Your Answer: Option
(Not Answered)
Correct Answer: Option

4.
is in the form of a sum-of-products expression.
True
False
Your Answer: Option
(Not Answered)
Correct Answer: Option

5.
A J-K flip-flop excitation table lists the present state, the next state, and the J and K levels required to produce each transition.
True
False
Your Answer: Option
(Not Answered)
Correct Answer: Option

6.
In many cases, counters must be strobed in order to eliminate glitches.
True
False
Your Answer: Option
(Not Answered)
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7.
Assume a 4-bit parallel in/serial out shift register is loaded with a binary number. How many clock pulses are required after the parallel load has occurred before the first bit in the sequence appears on the serial output line?
0
1
2
3
Your Answer: Option
(Not Answered)
Correct Answer: Option

8.
The 2147 4K × 1 static RAM contains 4096 storage locations storing one bit each. ________ 2147 RAM memory chip(s) is/are needed to configure an 8K × 8 memory.
One
Four
Eight
Sixteen
Your Answer: Option
(Not Answered)
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9.
The distinction between CPLDs and FPGAs is ________.
well known
very small
often fuzzy
very large
Your Answer: Option
(Not Answered)
Correct Answer: Option

10.
The GAL16V8 has architecture that is very similar to the ________ device.
PAL
PROM
PLD
SPLD
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(Not Answered)
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11.
NOR gates can be used to construct AND gates.
True
False
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(Not Answered)
Correct Answer: Option

12.
A logic probe is placed on the input of a digital circuit and the probe lamp blinks slowly, indicating ________.
that an open or bad logic level exists
a high level output
a high-frequency pulse train
that the supply voltage is low
Your Answer: Option
(Not Answered)
Correct Answer: Option

13.
A frequency counter is a circuit that can measure and display the frequency of a signal.
True
False
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(Not Answered)
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14.
The frequency counter measures frequency by enabling a counter to count the number of pulses of the incoming waveform during a precisely specified period of time called the sampling time.
True
False
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(Not Answered)
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15.
What is the resolution, in percent, of a 12-bit DAC?
8.33
0.049
0.000488
0.083
Your Answer: Option
(Not Answered)
Correct Answer: Option

16.
________ ADCs use no clock signal, because there is no timing or sequencing required.
Actuator
Dual
Flash
Bipolar
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(Not Answered)
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17.
Fan-out is determined by taking the ________ result(s) of ________.
smaller,
larger,
smaller,
average,
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(Not Answered)
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18.
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)
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19.
This program code will be executed continuously:
STAT: MOV A, #01H
 JNZ STAT
True
False
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(Not Answered)
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20.
The start-conversion on the ADC0804 is done by using the:
CS line
INTR line
V ref/2 line
Your Answer: Option
(Not Answered)
Correct Answer: Option

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