Electronics and Communication Engineering - Microprocessors

1. 

Which of the following is a valid integer constant?

A. 127
B. 127.0
C. 127
D. 125 + 3

Answer: Option A

Explanation:

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2. 

The five flags in 8085 are designated as

A. Z, CY, S, P and AC
B. D, Z, S, P, AC
C. Z, C, S, P, AC
D. Z, CY, S, D, AC

Answer: Option A

Explanation:

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3. 

It is desired to evaluate the expression
F = B cos Y + C cos2 Y + A cos3 Y
The Pascal equivalent to ensure minimum computer time should be written as

A. F = B * COS (Y) + C * SQR (COS (Y) + A * COS (Y) * COS (Y) * COS (Y)
B. F = B * COS (Y) + C * SQR [COS (Y)] + A * COS (Y) * SQR [COS (Y)]
C. F = B * COS (Y) + C * COS(Y) * COS (Y) + A * COS (Y) * COS (Y) * COS (Y)
D. X = COS(Y)
Z = SQR (X)
F = B * X + C * Z + A * X * Z

Answer: Option D

Explanation:

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4. 

In 8085 which addressing mode is also called inherent addressing?

A. Direct
B. Register
C. Implicit
D. Immediate

Answer: Option C

Explanation:

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5. 

Consider the following statements for 8085

  1. The most significant 8 bits of address are transmitted on the 8 lines on which data is transmitted.
  2. Eight pins are dedicated to transmit the most significant 8 bits of memory address.
  3. The least significant 8 bits of address are transmitted on the lines on which data is transmitted.
  4. The data and leass significant 8 bits are transmitted at different points in time.
Which of the above statements are correct?

A. all
B. 1, 2 and 3 only
C. 2, 3 and 4 only
D. 1, 3 and 4 only

Answer: Option C

Explanation:

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