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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 19
21.

Assertion (A): Decoder is not a combinational circuit.

Reason (R): Every memory element of semi conductor form has a decoder.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is true, R is false
A is false, R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
In 8085 microprocessor, in order to enable RST 5.5, RST 6.5 and RST 7.5 interrupts, which of the following instruction are needed?
EI only
SIM only
EI and SIM both
None
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
A retriggerable one shot is one which
can be triggered only once
has two quasi stable states
can not be retriggered till the complete pulse appears at output
can be retriggered while the output is being generated
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
A(A + B) =
A
A B
AB
AB
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
For the K map in the given figure, the simplified expression is
xl x2 x4 + x2 x4 + x1 x3
x2 x4 + x2 x4 + x1 x3
x1 x2 x4 + xl x2 + x3 x4 + x2x4
x1 x2 + x2 x3 + x3x4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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