Electronics and Communication Engineering - Digital Electronics

1. 

Assertion (A): The TTL output acts as a current sink in low state

Reason (R): The TTL input current is largest in low state.

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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2. 

The number of LED display indicators in logic probe are

A. 1
B. 2
C. 1 or 2
D. 4

Answer: Option B

Explanation:

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3. 

The time needed by a TTL circuit to switch from 0 to 1 or 1 to 0 is about

A. 10 μs
B. 10 ns
C. 100 μs
D. 50 ns

Answer: Option B

Explanation:

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4. 

Assertion (A): R-2R ladder type DAC has higher speed of operation than weighted resistor DAC

Reason (R): R-2R ladder type DAC uses only two different values of resistor network uses many different values of resistors

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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5. 

Which of the following circuits can be used as parallel-to-series converter?

A. Digital counter
B. Decoder
C. Demultiplexer
D. Multiplexer

Answer: Option D

Explanation:

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