Electronics and Communication Engineering - Digital Electronics

21. 

In 8085 microprocessor, even after a Reset operation which of the following interrupts remains enabled?

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

Answer: Option D

Explanation:

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22. 

A decoder can be used as a demultiplexer.

A. True
B. False

Answer: Option A

Explanation:

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23. 

ADC 0804 is a

A. dual slope A/D converter
B. single slope A/D converter
C. successive approximation A/D converter
D. either (a) or (b)

Answer: Option C

Explanation:

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24. 

The noise margin of a TTL gate is about

A. 0.2 V
B. 0.4 V
C. 0.6 V
D. 0.8 V

Answer: Option C

Explanation:

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25. 

Assertion (A): BCD code is used in pocket calculators

Reason (R): BCD code is slower than binary.

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 true, R is false
D. A is false, R is true

Answer: Option B

Explanation:

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