Electronics and Communication Engineering - Digital Electronics

26. 

Which of the following binary product is incorrect?

A. 1100 x 1010 = 1111000
B. 1.01 x 10.1 = 11.001
C. 1100110 x 1000 = 1100110000
D. None of the above

Answer: Option D

Explanation:

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27. 

Assertion (A): The advantages of totem pole output are fast switching and low power consumption.

Reason (R): IC packages available are DIP, surface mount and J lead surface mount.

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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28. 

In DTL the junction transistor serves as

A. inverter
B. buffer amplifier
C. both (a) and (b)
D. none of the above

Answer: Option C

Explanation:

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29. 

A 16 x 8 ROM stores these words in its first four locations, as given below. Which of this represents 3 CH in hexadecimal?

A. R0 = 1110 0010
B. R1 = 0101 0111
C. R2 = 0011 1100
D. R3 = 1011 1111

Answer: Option C

Explanation:

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30. 

Decade counter has 4 flip flops and skips states 10 to 15.

A. True
B. False

Answer: Option A

Explanation:

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