Online Digital Electronics Test - Digital Electronics Test - Random

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!

The real world is mainly analog.

True

False

[#]

The primary advantage of the hexadecimal number system is the ease with which conversion can be made between binary and hexadecimal numbers.

True

False

[#]

The decimal equivalent of the BCD number 1010 is ________.

invalid

[#]

The following combination is correct for an EVEN parity data transmission system:
data = 100111100 and parity = 0

True

False

[#]

The K-map provides a "graphical" approach to simplifying sum-of-products expressions.

True

False

[#]

PRESET and CLEAR inputs are normally synchronous.

True

False

[#]

When a computer is executing a program of instructions, the CPU continually fetches information from those locations in memory that contain (1) the program codes representing the operations to be performed and (2) the data to be operated upon.

True

False

[#]

A(n) ________ is user programmable and can also be erased electronically and reprogrammed as often as desired.

PROM

ROM

EEPROM

EPROM

[#]

Read-only memory is memory ________.

that has unlimited storage capacity

whose data can never be altered by the user

that must be refreshed periodically or it will lose storage

that maintains storage as long as power is applied

[#]

10.

Flash memories are so called because of the rapid ________ times.

read and write

format and erase

erase and read

erase and write

[#]

11.

Which is a major digital system category?

Standard logic devices

ASICs

Microprocessor/DSP devices

All of the above

[#]

12.

The truth table for a full adder is shown below. What are the values of X, Y, and Z?

X = 0, Y = 1, Z = 1

X = 1, Y = 1, Z = 1

X = 1, Y = 0, Z = 1

X = 0, Y = 0, Z = 1

[#]

13.

Using 4-bit adders to create a 1See Section 6-bit adder:

requires 16 adders.

requires 4 adders.

requires the carry-out of the less significant adder to be connected to the carry-in of the next significant adder.

requires 4 adders and the connection of the carry out of the less significant adder to the carry-in of the next significant adder.

[#]

14.

Solve this binary problem:

1001

0110

0111

0101

[#]

15.

The lower transistor of a totem-pole output is saturated when the gate output is ________.

overdriven

HIGH

LOW

malfunctioning

[#]

16.

The minimum input voltage recognized as HIGH by a TTL gate is ________.

2.0 V

2.4 V

0.8 V

5.0 V

[#]

17.

The time it takes for an input signal to pass through internal circuitry and generate the appropriate output effect is known as ________.

fan-out

propagation delay

rise time

fall time

[#]

18.

What is the purpose of a decoder's inputs?

To allow the decoder to respond to the inputs to activate the correct output gate.

To disable the decoder outputs so that all outputs will be inactive.

To disable the inputs and activate all outputs.

To allow the decoder to respond to the inputs to activate the correct output gate, and to disable the inputs and activate all outputs.

[#]

19.

What is the range of invalid TTL output voltage?

0.0–0.4 V

0.4–2.4 V

2.4–5.0 V

0.0–5.0 V

[#]

20.

The total amount of external code memory that can be interfaced to the 8051 is:

32K

64K

128K

256K

[#]

Quick links

Quantitative Aptitude

Verbal (English)

Reasoning

Programming

Interview

Placement Papers

Online Digital Electronics Test - Digital Electronics Test - Random

Marks : 2/20

Test Review : View answers and explanation for this test.

Current Affairs

Interview Questions

Group Discussions