Exercise: Microprocessors

Questions for: Microprocessors

Assertion (A): In microprocessor 8085 DMA allows direct access to memory to speed up data transfer.

Reason (R): HOLD and HLDA signals are used for DMA operations.

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: B
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When a peripheral device is not ready for data transfer it will send to the microprocessor a
A:
low READY bit
B:
high READY bit
C:
low or high READY bit depending on whether input or output is activated
D:
none of the above
Answer: A
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The memory hierarchy in microprocessor based system is
A:
register, cache, primary, mass, off line back up
B:
cache, register, primary, mass, off line back up
C:
cache, register, mass, primary, off line back up
D:
register, cache, mass, primary, off line back up
Answer: A
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For an accurate clock period in 8085 it is preferable to use
A:
Crystal
B:
Crystal or LC resonant circuit
C:
Crystal or RC circuit
D:
LC or RC circuit
Answer: A
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Consider the following about 'return' statement in C
  1. On executing the return statement, it immediately transfers the control back to the calling program.
  2. There is no restriction on the number of 'return' statements present in a function.
  3. The 'return' statement must be present at the end of called function.
Which of the above are correct?
A:
All
B:
1 and 2 only
C:
1 and 3 only
D:
2 and 3 only
Answer: B
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