# Online Digital Electronics Test - Digital Electronics Test 3

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!

#### Marks : 2/20

Total number of questions

20

Number of answered questions

0

Number of unanswered questions

20

##### Test Review : View answers and explanation for this test.

1.

Convert the Gray code 1011 to binary.

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Learn more problems on : Number Systems and Codes

2.

A binary number can be converted to a decimal number by summing the decimal values of the weights of all the 1s in the binary number.

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Learn more problems on : Number Systems and Codes

3.

12

_{10 }= 1101_{2}= C_{16}= 00010010 BCDYour Answer: Option

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Learn more problems on : Number Systems and Codes

4.

A 4-variable AND-OR circuit produces a 1 at its Y output. Which combination of inputs is correct?

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Learn more problems on : Combinational Logic Analysis

5.

The expression can be directly implemented using only ________.

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Learn more problems on : Combinational Logic Analysis

6.

The pulse width of a one-shot circuit is determined by ________.

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Learn more problems on : Flip-Flops

7.

Synchronous binary counters can only be used for the application of timing of digital systems.

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Learn more problems on : Counters

8.

An OR gate with inverted inputs functions as:

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Learn more problems on : Describing Logic Circuits

9.

Subtract the following binary numbers.

0101 1000 | 1010 0011 | 1101 1110 | ||

–0010 0011 | –0011 1000 | –0101 0111 |

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Learn more problems on : Digital Arithmetic Operations and Circuits

10.

How many BCD adders would be required to add the numbers 973

_{10}+ 39_{10}?Your Answer: Option

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Learn more problems on : Digital Arithmetic Operations and Circuits

11.

Inside a computer all arithmetic operations take place in the ________.

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Learn more problems on : Digital Arithmetic Operations and Circuits

12.

The major advantage of CMOS logic circuits over TTL is very low power consumption.

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Learn more problems on : Integrated-Circuit Logic Families

13.

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

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Learn more problems on : Integrated-Circuit Logic Families

14.

The 74139 dual four-line demultiplexer functions as a decoder if ________.

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Learn more problems on : MSI Logic Circuits

15.

In HDL, the operation of the DEMUX is exactly described using a ________.

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Learn more problems on : MSI Logic Circuits

16.

In the keypad encoder, just after the 4 ms mark, the simulation initiates the release of the key by changing the column value to ________, which causes the d output to go into its Hi-Z state.

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Learn more problems on : Digital System Projects Using HDL

17.

Determine the output voltage *V*_{out} for the circuit in the given figure.

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Learn more problems on : Signals and Switches

18.

What is a disadvantage of CMOS in place of TTL?

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Learn more problems on : Signals and Switches

19.

Show from the truth table how an exclusive-OR gate can be used to invert the data on one input if the other input is a special control function.

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Learn more problems on : Ex-OR and Ex-NOR Gates

20.

The RST pin requires a HIGH to reset the 8051 microcontroller.

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Learn more problems on : The 8051 Microcontroller

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