Digital Electronics Test 2 - Online Electronics and Communication Engineering Test

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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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Marks : 2/20

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An 8 bit data is to be entered into a parallel in register. The number of clock pulses required is

[#]

When microprocessor processes both positive and negative numbers, the representation used is

l's complement

2's complement

signed binary

any of the above

[#]

For the logic circuit of the given figure the simplified Boolean expression is

A + BC

A + B C

A + BC

[#]

71₈ = __________ .

111000₂

111001₂

100001₂

110001₂

[#]

In the TTL circuit in the figure, S₂ to S₀ are select lines and X₇ to X₀ are input lines. S₀ and X₀ are LSBs. The output Y is

Indeterminate

A ⊕ B

C . A ⊕ B + C . (A ⊕ B)

[#]

How many JK flip-flops are needed to make a 4-bit shift register?

[#]

A compiler is a software programme which

change high level Programming language into low level machine language

change the program into binary form

assembles the program

executes the program

[#]

A half adder adds __________ bits and a full adder adds __________ bits.

two, three

three, four

four, six

two, four

[#]

A 555 timer can be used as

an astable multivibrator

monostable multivibrator

frequency Divider only

any of the above

[#]

10.

In a Karnaugh map for an expression having 'don't care terms' the don't cares can be treated as

1 or 0

none of the above

[#]

11.

The Boolean function A + BC is reduced form of

AB + BC

AB + ABC

(A + B) (A + C)

(A + C)B

[#]

12.

Which of the following is coincidence logic circuit?

[#]

13.

The circuit in the given figure is

half adder

full adder

half subtractor

full subtractor

[#]

14.

7483 is a TTL binary adder. It can add

two 4-bit binary numbers

four 6-bit binary numbers

four 8-bit binary numbers

any number of 4-bit numbers

[#]

15.

Mark the false statement:

since wave-shape of a digital signal is unimportant, linear amplifiers are not required

the precise amplitude of a digital signal is also unimportant provided two voltage levels (0 and 1) are quite different

the leading and trailing edges of a digital signal need not be sharp

actual digital waves have rise and fall times of the order of a few nano seconds

[#]

16.

The address to which a software or hardware restart branches is known as

Vector location

SID

SOD

TRAP

[#]

17.

Consider the following digital circuits:

Multipliers
Read only memories
D-latch
Circuits as shown

Which of these come under the class of combinational circuit?

1 and 2

3 and 4

1, 2 and 3

1, 2, 3 and 4

[#]

18.

A 16 x 8 ROM stores these words in its first four locations, as given below. Which of this represents 3 CH in hexadecimal?

R₀ = 1110 0010

R₁ = 0101 0111

R₂ = 0011 1100

R₃ = 1011 1111

[#]

19.

What is the maximum output voltage from the 741 op-amp?

Zero

Approximately 1 V

Approximately 3 V

Approximately 5 V

[#]

20.

Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after ACI 0 A4 H?

4 AH, 0

4 AH, 1

4 BH, 0

4 BH, 1

[#]

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Online Electronics and Communication Engineering Test - Digital Electronics Test 2

Marks : 2/20

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