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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 5
46.
The number of digits in hexadecimal system
15
16
10
8
Answer: Option
Explanation:

It has 16 digits 0 to 15.

47.
Which of these is the most recent display device?
LED
LCD
VF
(a) and (c)
Answer: Option
Explanation:

VF display can operate at very low voltages, has low power consumption and very long life.

48.
A NOR gate has 3 inputs A, B, C. For which combination of inputs is output HIGH
A = B = C = 0
A = B = C = 1
A = B = 1 and C = 0
A = C = 1 and B = 0
Answer: Option
Explanation:

NOR gate gives High output when all inputs are Low.

49.
In 2's complement form, - 2 is
1011
1110
1100
1010
Answer: Option
Explanation:

A = 1110,

A = 0001,

A + 1 = 0001 + 1 = 0010 = 2

Therefore A = -2.

50.
The Boolean function/implemented in the figure using two I/P multiplexers is
ABC + ABC
ABC + AB C
ABC + ABC
ABC + AB C
Answer: Option
Explanation:

when B = 1, f1 = ABC

B = 0, f2 = ABC

f = f1 + f2 = ABC + ABC.

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