Electronics and Communication Engineering - Microprocessors

16. 

For converting a decimal number into octal number, the decimal number is expressed as a series of the type

A.
B.
C.
D. None of the above

Answer: Option A

Explanation:

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17. 

Consider the following statements

  1. The sign of a floating point number depends on the sign of mantissa only.
  2. If the absolute value of a number is less than 1, the sign of exponent is zero or positive.
  3. With sign bit of mantissa as 0, increasing the exponent from a positive to a more positive value gives a larger floating point number.
Which of the above are correct?

A. All
B. 1 and 2 only
C. 1 and 3 only
D. 2 and 3 only

Answer: Option C

Explanation:

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18. 

Assertion (A): In microprocessor 8085 instruction LXIB, 90 FF H means register B and C are loaded with upper and lower bytes to get B = 90 H and C = FFH.

Reason (R): In 8085 the stack pointer indicates which memory location is to accessed.

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 correct R is wrong
D. A is wrong R is correct

Answer: Option B

Explanation:

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19. 

To add 8 bit words, two IC 74181 can be cascaded.

A. True
B. False

Answer: Option A

Explanation:

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20. 

The initial contents of ACC and CY in 8085 are

  1. CY = 1
  2. ACC = 10000001
After instruction RAL is executed once the contents of CY and ACC respectively will be

A. 1 and 00000011
B. 0 and 00000011
C. 1 and 00000001
D. 0 and 00000001

Answer: Option A

Explanation:

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