Electronics and Communication Engineering - Digital Electronics

6. 

Consider the Boolean expression X = ABCD + ABCD + ABCD + ACBD The simplified form of X is

A. C + D
B. BC
C. CD
D. B

Answer: Option C

Explanation:

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7. 

In floating point representation the number of bits in exponent is

A. 8
B. 7
C. 6
D. 5

Answer: Option C

Explanation:

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8. 

In 8085 microprocessor, an active low signal INTA is not needed from up service which of the following interrupt request?

A. TRAP
B. INTR
C. RST 7.5
D. RST 5.5

Answer: Option A

Explanation:

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9. 

Consider the following statements:

  1. In the 2's complement representation, negative numbers are stored in sign magnitude form.
  2. Taking 2's complement is equivalent to sign change.
  3. In a 4 bit complement representation of a binary number A.
  4. In the 2's complement representation the most significant bit (MSB) is zero for a positive number.
Of these, the only true statements are

A. (I) and (III)
B. (I) and (IV)
C. (II) and (III)
D. (II) and (IV)

Answer: Option D

Explanation:

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10. 

Without any addition circuitry, an 8:1 MUX can be used to obtain.

A. some but not all Boolean functions of 3 variables
B. all functions of 3 variables but none of 4 variables
C. all functions of 3 variables and some but not all of 4 variables
D. all functions of 4 variables

Answer: Option B

Explanation:

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