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.

In the keypad HDL encoder, as long as all columns are high the ring counter is enabled and counting.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Digital System Projects Using HDL

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2.

A certain gate draws 1.8 A when its output is HIGH and 3.3 µA when its output is LOW. VCC is 5 V and the gate is operated on a 50% duty cycle. What is the average power dissipation (PD)?

A.
2.55 W
B.
1.27 W
C.
12.75 W
D.
5 W

Your Answer: Option (Not Answered)

Correct Answer: Option C

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3.

In a 4-bit R/2R ladder digital-to-analog converter, because of negative feedback, the operational amplifier keeps the inverting (minus) input near ________.

A.
5 volts
B.
zero volts
C.
a voltage determined by the binary weighted input
D.
none of the above

Your Answer: Option (Not Answered)

Correct Answer: Option B

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4.

The special function registers can be referred to by their hex addresses or by their register names.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : The 8051 Microcontroller

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5.

Which of the following summarizes the important features of emitter-coupled logic (ECL)?

A.
low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption
B.
good noise immunity, negative logic, high-frequency capability, low power dissipation, and short propagation time
C.
low propagation time, high-frequency response, low power consumption, and high output voltage swings
D.
poor noise immunity, positive supply voltage operation, good low-frequency operation, and low power

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Logic Families and Their Characteristics

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6.

The phenomenon of interpreting unwanted signals on J and K while Cp (clock pulse) is HIGH is called ________.

A.
parity error checking
B.
ones catching
C.
digital discrimination
D.
digital filtering

Your Answer: Option (Not Answered)

Correct Answer: Option B

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7.

Antifuse devices are volatile.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Programmable Logic Device

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8.

What is the major advantage of the R/2R ladder DAC as compared to a binary-weighted-input DAC?

A.
It has fewer parts for the same number of inputs.
B.
It is much easier to analyze its operation.
C.
It uses only two different resistor values.
D.
The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Interfacing to the Analog World

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9.

In a frequency counter, what happens at high frequencies when the sampling interval is too long?

A.
The counter works fine.
B.
The counter undercounts the frequency.
C.
The measurement is less precise.
D.
The counter overflows.

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Digital System Projects Using HDL

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10.

Computers operate on data internally in a ________ format.

A.
tristate
B.
universal
C.
parallel
D.
serial

Your Answer: Option (Not Answered)

Correct Answer: Option C

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11.

Assume that a 4-bit serial in/serial out shift register is initially clear. We wish to store the nibble 1100. What will be the 4-bit pattern after the second clock pulse? (Right-most bit first.)

A.
1100
B.
0011
C.
0000
D.
1111

Your Answer: Option (Not Answered)

Correct Answer: Option C

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12.

Why does the data sheet for the 7476 only give a minimum value for the clock pulse width (both HIGH and LOW)?

A.
nominal value
B.
best-case condition
C.
worst-case condition

Your Answer: Option (Not Answered)

Correct Answer: Option C

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13.

A full adder has a carry-in.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Digital Arithmetic Operations and Circuits

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14.

Which timing diagram shown below is correct for an inverter?

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

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Describing Logic Circuits

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15.

The commutative law of addition and multiplication indicates that:

A.
we can group variables in an AND or in an OR any way we want
B.
an expression can be expanded by multiplying term by term just the same as in ordinary algebra
C.
the way we OR or AND two variables is unimportant because the result is the same
D.
the factoring of Boolean expressions requires the multiplication of product terms that contain like variables

Your Answer: Option (Not Answered)

Correct Answer: Option C

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16.

In a register stack, data moves up but not down.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Memory and Storage

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17.

Generally speaking, the synchronous counter requires more circuitry than an asynchronous counter.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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18.

The data sheet for the 74 series of TTL ICs shows that Vcc has a range of 4.5 V to 5.5 V.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Integrated-Circuit Logic Families

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19.

A ferromagnetic material is one that forms a resistance to magnetic fields.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Shift Registers

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20.

The two digits in the binary number system are ___ and ___.

A.
1, 2
B.
H, L
C.
T, F
D.
0, 1

Your Answer: Option (Not Answered)

Correct Answer: Option D

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