Electronics and Communication Engineering - Digital Electronics

36. 

K maps can be drawn

A. only for 2 variables
B. only for 3 variables
C. only for 4 variables
D. for any number of variables

Answer: Option D

Explanation:

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37. 

When a TTL is driving an CMOS gates it is necessary to ensure that

A. VOL(for TTL) ≤ VIL (for CMOS) and V0H (for TTL) ≥ VIH (for CMOS)
B. V0L (for TTL) ≥ VIL (for CMOS)
C. V0H (for TTL) ≤ VIH (for CMOS)
D. V0L (for TTL) ≥ VIL (for CMOS) and V0H (for TTL) ≤ VIH (for CMOS)

Answer: Option A

Explanation:

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38. 

Which of the following statement is correct?

A. Decimal 9 is represented as 1011 in Excess-3 code
B. Decimal 9 is represented as 1001 is BCD code
C. Decimal 10 is represented as 1100 is Gray code
D. Decimal 10 is represented as 1001 in binary code

Answer: Option B

Explanation:

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39. 

For emitter-couple logic, the switching speed is very high because

A. negative logic is used
B. the transistors are not saturated when conducting
C. emitter-coupled transistors are used
D. multi-emitter transistors are used

Answer: Option B

Explanation:

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40. 

Subroutines are used in larger programs not

A. to increase the programming case
B. to reduce storage equipment
C. to reduce program extension time
D. for ease of program testing at the program development time

Answer: Option D

Explanation:

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