Online Digital Electronics Test - Digital Electronics Test 3



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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.

Convert the Gray code 1011 to binary.

A.
1011
B.
1010
C.
0100
D.
1101

Your Answer: Option (Not Answered)

Correct Answer: Option D

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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

Your Answer: Option (Not Answered)

Correct Answer: Option A

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3.

1210 = 11012 = C16 = 00010010 BCD

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

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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

Your Answer: Option (Not Answered)

Correct Answer: Option C

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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

Your Answer: Option (Not Answered)

Correct Answer: Option C

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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

Your Answer: Option (Not Answered)

Correct Answer: Option A

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7.

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

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

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8.

An OR gate with inverted inputs functions as:

A.
an AND gate.
B.
a NAND gate.
C.
a NOR gate.
D.
an inverter.

Your Answer: Option (Not Answered)

Correct Answer: Option B

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9.

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

A.
3
B.
4
C.
5
D.
6

Your Answer: Option (Not Answered)

Correct Answer: Option A

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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

Your Answer: Option (Not Answered)

Correct Answer: Option B

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11.

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

A.
accumulator register
B.
ALU
C.
CPU
D.
B register

Your Answer: Option (Not Answered)

Correct Answer: Option B

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12.

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

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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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

Your Answer: Option (Not Answered)

Correct Answer: Option A

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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

Your Answer: Option (Not Answered)

Correct Answer: Option A

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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

Your Answer: Option (Not Answered)

Correct Answer: Option D

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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

Your Answer: Option (Not Answered)

Correct Answer: Option D

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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

Your Answer: Option (Not Answered)

Correct Answer: Option D

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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

Your Answer: Option (Not Answered)

Correct Answer: Option A

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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.

Your Answer: Option (Not Answered)

Correct Answer: Option B

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20.

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

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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