Online Digital Electronics Test - Digital Electronics Test 3 Loading Test...

Instruction:

• This is a FREE online test. DO NOT pay money to anyone to attend this test.
• 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.

Convert the Gray code 1011 to binary.

A.
 1011 B.
 1010 C.
 0100 D.
 1101 Correct Answer: Option D

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.

A.
 True B.
 False Correct Answer: Option A

Learn more problems on : Number Systems and Codes

3.

1210 = 11012 = C16 = 00010010 BCD

A.
 True B.
 False Correct Answer: Option B

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?

A.
 A = 0, B = 0, C = 0, D = 0 B.
 A = 0, B = 1, C = 1, D = 0 C.
 A = 1, B = 1, C = 0, D = 0 D.
 A = 1, B = 0, C = 0, D = 0 Correct Answer: Option C

Learn more problems on : Combinational Logic Analysis

5.

The expression can be directly implemented using only ________.

A.
 an XOR gate B.
 an XNOR gate C.
 an AOI circuit D.
 three 2-input NAND gates Correct Answer: Option C

Learn more problems on : Combinational Logic Analysis

6.

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

A.
 a resistor and capacitor B.
 two resistors C.
 two capacitors D.
 none of the above Correct Answer: Option A

7.

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

A.
 True B.
 False Correct Answer: Option B

8.

An OR gate with inverted inputs functions as:

A.
 an AND gate. B.
 a NAND gate. C.
 a NOR gate. D.
 an inverter. Correct Answer: Option B

Learn more problems on : Describing Logic Circuits

9.

How many BCD adders would be required to add the numbers 97310 + 3910?

A.
 3 B.
 4 C.
 5 D.
 6 Correct Answer: Option A

Learn more problems on : Digital Arithmetic Operations and Circuits

10.

Subtract the following binary numbers.
 0101 1000 1010 0011 1101 1110 –0010 0011 –0011 1000 –0101 0111

A.
 0011  0100    0110  1010    1000  0110 B.
 0011  0101    0110  1011    1000  0111 C.
 0011  0101    0110  1010    1000  0111 D.
 0011  0101    0110  1010    1000  0110 Correct Answer: Option B

Learn more problems on : Digital Arithmetic Operations and Circuits

11.

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

A.
 accumulator register B.
 ALU C.
 CPU D.
 B register Correct Answer: Option B

Learn more problems on : Digital Arithmetic Operations and Circuits

12.

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

A.
 True B.
 False Correct Answer: Option A

Learn more problems on : Integrated-Circuit Logic Families

13.

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

A.
 2.0 V B.
 2.4 V C.
 0.8 V D.
 5.0 V Correct Answer: Option A

Learn more problems on : Integrated-Circuit Logic Families

14.

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

A.
 the line is grounded B.
 data input is on the line C.
 data input is on the A0 line D.
 the A0 line is grounded Correct Answer: Option A

Learn more problems on : MSI Logic Circuits

15.

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

A.
 function B.
 process C.
 variable type D.
 number of conditional signal assignment statements Correct Answer: Option D

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.

A.
 0 hex B.
 4 hex C.
 8 hex D.
 F hex Correct Answer: Option D

Learn more problems on : Digital System Projects Using HDL

17.

Determine the output voltage Vout for the circuit in the given figure. A.
 –0.5 V B.
 0 V C.
 +5 V D.
 +4.3 V Correct Answer: Option D

Learn more problems on : Signals and Switches

18.

What is a disadvantage of CMOS in place of TTL?

A.
 It switches slower. B.
 It uses less power. C.
 It is smaller. D.
 cost Correct Answer: Option A

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.

A.
 Using A as the control, when A = 0, X is the same as B. When A = 1, X is the same as B. B.
 Using A as the control, when A = 0, X is the same as B. When A = 1, X is the inverse of B. C.
 Using A as the control, when A = 0, X is the inverse of B. When A = 1, X is the same as B. D.
 Using A as the control, when A = 0, X is the inverse of B. When A = 1, X is the inverse of B. Correct Answer: Option B

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

20.

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

A.
 True B.
 False Correct Answer: Option A

Learn more problems on : The 8051 Microcontroller