Electronics and Communication Engineering - Digital Electronics

21. 

A universal shift register can shift left or right.

A. True
B. False

Answer: Option A

Explanation:

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22. 

The circuit given below is a

A. counter
B. digital to analog converter
C. two-bit series-to-parallel converter
D. analog-to digital converter

Answer: Option C

Explanation:

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23. 

The high voltage level of a digital signal in positive logic is

A. 1
B. 0
C. either 1 or 0
D. -1

Answer: Option A

Explanation:

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24. 

A 7477 decoder drives

A. seven-segment display
B. nickel tape
C. relays
D. diode matrix

Answer: Option A

Explanation:

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25. 

BCD numbers are useful whenever

A. binary to hexadecimal conversion is desired
B. binary to BCD conversion is desired
C. decimal information is transferred into or out of a digital system
D. none of the above

Answer: Option C

Explanation:

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