Online Digital Electronics Test - Digital Electronics Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Four bits equal one byte.

True

False

[#]

In a negative logic system, the area represented by #3 in the given figure would be the ________ level.

HIGH

LOW

off

uncertain

[#]

The given figure is most likely a ________.

decoder

counter

multiplexer

[#]

One of De Morgan's theorems states that

. Simply stated, this means that logically there is no difference between:

a NOR and an AND gate with inverted inputs

a NAND and an OR gate with inverted inputs

an AND and a NOR gate with inverted inputs

a NOR and a NAND gate with inverted inputs

[#]

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

[#]

In synchronous systems, the exact times at which any output can change state are determined by a signal commonly called the ________.

traffic

flip-flop

clock

[#]

Dynamic memory cells store a data bit in a ________.

diode

resistor

capacitor

flip-flop

[#]

ROMs are used to store data that generally cannot be easily changed.

True

False

[#]

Assume a ROM to be tested is compared with a known good ROM. If the checksums differ, the ROM is ________.

very likely to be good

definitely good

very likely to be bad

definitely bad

[#]

10.

GAL is an acronym for ________.

Generic Array Logic

General Array Logic

Giant Array Logic

Generic Analysis Logic

[#]

11.

The GAL16V8 has 32 input variables.

True

False

[#]

12.

The ________ is the most popular standard logic device family today.

TTL

CMOS

ECL

None of the above

[#]

13.

The resolution of a DAC can be expressed as the ________.

minimum output voltage

number of bits that are converted to an analog output

deviation of the output from a straight line

difference between the expected and actual outputs

[#]

14.

For a 4-bit parallel adder, if the carry-in is connected to a logical HIGH, the result is:

the same as if the carry-in is tied LOW since the least significant carry-in is ignored.

that carry-out will always be HIGH.

a one will be added to the final result.

the carry-out is ignored.

[#]

15.

34FC + AD31 = ________.

E22D

E31D

E21D

E42D

[#]

16.

The outputs of a 7485 four-bit magnitude comparator when the inputs are A = 0110 and B = 1010 are:

A < B is 1
A = B is 0
A > B is 1

True

False

[#]

17.

Basically, a multiplexer changes parallel data inputs to a serial output.

True

False

[#]

18.

Totem-pole outputs ________ be connected ________ because ________.

can, in parallel, sometimes higher current is required

cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices

should, in series, certain applications may require higher output voltage

can, together, together they can handle larger load currents and higher output voltages

[#]

19.

Can a 74HCMOS logic gate directly connect to a 74ALSTTL gate?

Yes

[#]

20.

Which family of devices has the characteristic of preventing saturation during operation?

TTL

MOS

ECL

IIL

[#]

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