Electronics and Communication Engineering  Digital Electronics
Exercise :: Digital Electronics  Section 19
6. 
Consider the Boolean expression X = ABCD + ABCD + ABCD + ACBD The simplified form of X is 
Answer: Option C
Explanation:

7. 
In floating point representation the number of bits in exponent is 
Answer: Option C
Explanation:

8. 
In 8085 microprocessor, an active low signal INTA is not needed from up service which of the following interrupt request?

Answer: Option A
Explanation:

9. 
Consider the following statements:  In the 2's complement representation, negative numbers are stored in sign magnitude form.
 Taking 2's complement is equivalent to sign change.
 In a 4 bit complement representation of a binary number A.
 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:

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:
