Exercise: Digital Electronics

Questions for: Digital Electronics

Using 2's complement, the largest positive and negative number which can be stored with 8 bits are
A:
+128 and -127
B:
+128 and -128
C:
+127 and -128
D:
+127 and -127
Answer: C

Largest positive number is 0111 111 = + 127 and largest negative number is 1000 0000 = -128.

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For the circuit of the given figure, the output equation is
A:
Y = ABCD
B:
Y = AB + CD
C:
Y = A + BCD
D:
Y = ABC + D
Answer: B

The inputs A and B are ANDed. Inputs B and C' so ANDed. The outputs of two AND gates are ORed.

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Assertion (A): In computers the data is stored in hexadecimal form

Reason (R): Hexadecimal representation is short as compared to binary representation.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is true, R is false
D:
A is false, R is true
Answer: D

Data is stored in binary form only.

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A 4 bit down counter can count from
A:
0000 to 1111
B:
1111 to 0000
C:
000 to 111
D:
111 to 000
Answer: B

It can count from 15 to 0 or 1111 to 0000.

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What will be conversion time of a successive approximation A/D converter which uses 2 MHz clock and 5 bit binary ladder containing 8 V reference.?
A:
2.5 μ sec
B:
25 μ sec
C:
3 μ sec
D:
4 μ sec
Answer: A

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