Online Digital Electronics Test - Digital Electronics Test 5



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Instruction:

  • Total number of questions : 20.
  • Time alloted : 30 minutes.
  • Each question carry 1 mark, no negative marks.
  • DO NOT refresh the page.
  • All the best :-).

1.

The given figure is most likely a ________.

A.
register
B.
decoder
C.
counter
D.
multiplexer

Your Answer: Option (Not Answered)

Correct Answer: Option A

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2.

Most computers store binary data in groups of 32 bits called Dwords.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

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3.

The truth table for the SOP expression has how many input combinations?

A.
1
B.
2
C.
4
D.
8

Your Answer: Option (Not Answered)

Correct Answer: Option D

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4.

is in the form of a sum-of-products expression.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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5.

In many cases, counters must be strobed in order to eliminate glitches.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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6.

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.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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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?

A.
0
B.
1
C.
2
D.
3

Your Answer: Option (Not Answered)

Correct Answer: Option B

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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.

A.
One
B.
Four
C.
Eight
D.
Sixteen

Your Answer: Option (Not Answered)

Correct Answer: Option D

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9.

The distinction between CPLDs and FPGAs is ________.

A.
well known
B.
very small
C.
often fuzzy
D.
very large

Your Answer: Option (Not Answered)

Correct Answer: Option C

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10.

The GAL16V8 has architecture that is very similar to the ________ device.

A.
PAL
B.
PROM
C.
PLD
D.
SPLD

Your Answer: Option (Not Answered)

Correct Answer: Option A

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11.

NOR gates can be used to construct AND gates.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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12.

A logic probe is placed on the input of a digital circuit and the probe lamp blinks slowly, indicating ________.

A.
that an open or bad logic level exists
B.
a high level output
C.
a high-frequency pulse train
D.
that the supply voltage is low

Your Answer: Option (Not Answered)

Correct Answer: Option C

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13.

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.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

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14.

A frequency counter is a circuit that can measure and display the frequency of a signal.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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15.

What is the resolution, in percent, of a 12-bit DAC?

A.
8.33
B.
0.049
C.
0.000488
D.
0.083

Your Answer: Option (Not Answered)

Correct Answer: Option B

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16.

________ ADCs use no clock signal, because there is no timing or sequencing required.

A.
Actuator
B.
Dual
C.
Flash
D.
Bipolar

Your Answer: Option (Not Answered)

Correct Answer: Option C

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17.

What is unique about TTL devices such as the 74SXX?

A.
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.
B.
The gate transistors are silicon (S), and the gates therefore have lower values of leakage current.
C.
The S denotes the fact that a single gate is present in the IC rather than the usual package of 2–6 gates.
D.
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 A

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18.

Fan-out is determined by taking the ________ result(s) of ________.

A.
smaller,
B.
larger,
C.
smaller,
D.
average,

Your Answer: Option (Not Answered)

Correct Answer: Option C

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19.

This program code will be executed continuously:
STAT: MOV A, #01H
 JNZ STAT

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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20.

The start-conversion on the ADC0804 is done by using the:

A.
B.
CS line
C.
INTR line
D.
V ref/2 line

Your Answer: Option (Not Answered)

Correct Answer: Option A

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