Electronics and Communication Engineering - Digital Electronics

11. 

A two-input OR gate is designed for positive logic. However, it is operated with negative logic. The resulting logic operation will then be

A. OR
B. AND
C. NOR
D. EX-OR

Answer: Option A

Explanation:

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12. 

A clock signal driving a 6-bit ring counter has a frequency of 1 MHz. How long is each timing bit high?

A. 1 ms
B. 2 ms
C. 3 ms
D. 6 ms

Answer: Option A

Explanation:

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13. 

A twisted ring counter consisting of 4 FF will have

A. 4 states
B. 8 states
C. 24 states
D. None of the above

Answer: Option B

Explanation:

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14. 

Assertion (A): In a serial in-serial out shift register, access is available only to the left most or right most flip flops

Reason (R): If the output of a shift register is feedback to serial input it can be used as a ring counter.

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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15. 

IC counters are

A. synchronous only
B. asynchronous only
C. both synchronous and asynchronous
D. none of the above

Answer: Option C

Explanation:

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