Electronics and Communication Engineering - Digital Electronics

21. 

The output of basic DTL configuration is

A. low when one of the input is high
B. low when all inputs are high
C. high when all inputs are high
D. high when all inputs are low

Answer: Option B

Explanation:

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22. 

figure shows three pulse train inputs to a 3-input AND gate. Assuming positive logic, the output signal obtained in figure would be

A.
B.
C.
D.

Answer: Option B

Explanation:

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23. 

The number of flip flops required to construct a register to store number 10210 in binary form is

A. 2
B. 4
C. 8
D. 10

Answer: Option D

Explanation:

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24. 

Minimum no. of 2 I/P NAND gate required to implement the Boolean function Z = ABC, assuming that A, B and C are available is

A. 2
B. 3
C. 5
D. 6

Answer: Option C

Explanation:

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25. 

In 8085 microprocessor, which of the following interrupts is unmaskable interrupts?

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

Answer: Option C

Explanation:

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