Online Digital Electronics Test - Digital Electronics Test - Random



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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 asynchronous inputs on a J-K flip-flop ________.

A.
are normally not at the active level at the same time
B.
take precedence over the J and K inputs
C.
do not require a clock pulse to affect the output
D.
all of the above

Your Answer: Option (Not Answered)

Correct Answer: Option D

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2.

A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n):

A.
Ex-NOR gate
B.
OR gate
C.
Ex-OR gate
D.
NAND gate

Your Answer: Option (Not Answered)

Correct Answer: Option C

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3.

A Johnson counter, constructed with N flip-flops, has how many unique states?

A.
N
B.
2N
C.
2N
D.
N2

Your Answer: Option (Not Answered)

Correct Answer: Option B

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4.

Linearity error is the maximum deviation in step size from the ideal step size.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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5.

The output of a gated S-R flip-flop changes only if the:

A.
flip-flop is set
B.
control input data has changed
C.
flip-flop is reset
D.
input data has no change

Your Answer: Option (Not Answered)

Correct Answer: Option B

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6.

A logic circuit with an output consists of ________.

A.
two AND gates, two OR gates, two inverters
B.
three AND gates, two OR gates, one inverter
C.
two AND gates, one OR gate, two inverters
D.
two AND gates, one OR gate

Your Answer: Option (Not Answered)

Correct Answer: Option C

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7.

What are two ways to remember the current state of a counter in VHDL?

A.
With FUNCTIONS and PROCESS
B.
With counters and timers
C.
With SIGNAL and VARIABLE
D.
With bit types

Your Answer: Option (Not Answered)

Correct Answer: Option C

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8.

How many inputs are required for a 1-of-16 decoder?

A.
2
B.
4
C.
8
D.
16

Your Answer: Option (Not Answered)

Correct Answer: Option B

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9.

A CD-ROM is a form of read-only memory in which data are stored as ________.

A.
magnetic "bubbles"
B.
magnetized spots
C.
"pits" on an optical disk
D.
tiny "pinholes" in an opaque substance

Your Answer: Option (Not Answered)

Correct Answer: Option C

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10.

The half-step sequence of a stepper motor is created by inserting a start with only one coil energized between full steps.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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11.

For a three-input AND gate, with the input waveforms as shown below, which output waveform is correct?

A.
a
B.
b
C.
c
D.
d

Your Answer: Option (Not Answered)

Correct Answer: Option C

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12.

Which of the following is not an analog device?

A.
Thermocouple
B.
Current flow in a circuit
C.
Light switch
D.
Audio microphone

Your Answer: Option (Not Answered)

Correct Answer: Option C

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13.

MPGA stands for:

A.
mass produced gated array.
B.
Morgan-Phillips gated array.
C.
memory programmed ROM.
D.
mask programmed ROM.

Your Answer: Option (Not Answered)

Correct Answer: Option D

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14.

GAL is an acronym for ________.

A.
Generic Array Logic
B.
General Array Logic
C.
Giant Array Logic
D.
Generic Analysis Logic

Your Answer: Option (Not Answered)

Correct Answer: Option A

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15.

The noise margin for TTL is 0.8 V.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

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16.

The Q output of a flip-flop is normally HIGH when the device is in the "CLEAR" or "RESET" state.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

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17.

Solve this BCD problem: 0101 + 0110 = ________.

A.
00010111BCD
B.
00001001BCD
C.
00010001BCD
D.
00010011BCD

Your Answer: Option (Not Answered)

Correct Answer: Option C

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18.

Determine the values of A, B, C, and D that make the product term equal to 1.

A.
A = 0, B = 1, C = 0, D = 1
B.
A = 0, B = 0, C = 0, D = 1
C.
A = 1, B = 1, C = 1, D = 1
D.
A = 0, B = 0, C = 1, D = 0

Your Answer: Option (Not Answered)

Correct Answer: Option A

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19.

In a GAL16V8, the D flip-flops contained in the OLMCs have ________ and ________.

A.
asynchronous reset, synchronous preset
B.
asynchronous preset, synchronous reset
C.
asynchronous clear, synchronous set
D.
asynchronous set, synchronous clear

Your Answer: Option (Not Answered)

Correct Answer: Option A

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20.

A serial in/parallel out, 4-bit shift register initially contains all 1s. The data nibble 0111 is waiting to enter. After four clock pulses, the register contains ________.

A.
0000
B.
1111
C.
0111
D.
1000

Your Answer: Option (Not Answered)

Correct Answer: Option C

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