Electronics and Communication Engineering - Digital Electronics

6. 

A 1 ms pulse can be converted into a 10 ms pulse by using which one of the following

A. An astable multivibrator
B. Stable multivibrator
C. A bistable multivibrator
D. A J-K flip-flop

Answer: Option B

Explanation:

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7. 

In the DRAM cell in the figure is the Vt of the NMOSFET is 1 V. For the following three combinations of WL and BL voltages.

A. 5 V, 3 V, 7 V
B. 4 V, 3 V, 4 V
C. 5 V, 5 V, 5 V
D. 4 V, 4 V, 4 V

Answer: Option C

Explanation:

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8. 

Assertion (A): The carry look ahead adder is very fast

Reason (R): The carry look ahead adder generates the carry and sum digits directly.

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 C

Explanation:

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9. 

The factors which govern fan out of CMOS gates are

A. maximum permissible propagation delay
B. input capacitance of each load
C. both (a) and (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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10. 

Which of the following subtraction operations do not result in F16?

  1. (BA)16 - (AB)16
  2. (BC)16 - (CB)16
  3. (CB)16 - (BC)16
  4. (CB)16 - (BC)16
Select the correct answer

A. 1 and 2
B. 1 and 3
C. 2 and 3
D. 1, 2 and 3

Answer: Option A

Explanation:

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