Electronics and Communication Engineering - Digital Electronics

31. 

When a binary adder is used as BCD adder, the sum is

A. correct when it is < 9
B. correct when it is > 9
C. correct when it is < 16
D. none of these

Answer: Option A

Explanation:

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32. 

A gate in which shift register is connected as shown in the figure below. How many clock pulse (after reset to '0') the contents of the shift register are '000' again?

A. 3
B. 6
C. 16
D. 8

Answer: Option B

Explanation:

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33. 

Out of SR and JK flip flops, which is susceptible to race condition?

A. SR
B. JK
C. Both SR and JK
D. None of the above

Answer: Option A

Explanation:

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34. 

Which liquid crystal is used for LCD display?

A. Mercury
B. Pneumatic fluid
C. Aqua regia
D. Liquid boron

Answer: Option B

Explanation:

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35. 

If interrupt service request have been received from all of the following interrupts, then which one will be serviced last?

A. RST 5.5
B. RST 6.5
C. RST 7.5
D. None of these

Answer: Option A

Explanation:

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