Shift Registers - General Questions (6)

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Shift Registers - General Questions

41.

The group of bits 11001 is serially shifted (right-most bit first) into a 5-bit parallel output shift register with an initial state 01110. After three clock pulses, the register contains ________.

A.	01110
B.	00001
C.	00101
D.	00110

Answer: Option C

Explanation:

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42.

Stepper motors have become popular in digital automation systems because ________.

A.	of their low cost
B.	they are driven by sequential digital signals
C.	they can be used to provide repetitive mechanical movement
D.	they are driven by sequential digital signals and can be used to provide repetitive mechanical movement

Answer: Option D

Explanation:

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43.

A modulus-12 ring counter requires a minimum of ________.

A.	10 flip-flops
B.	12 flip-flops
C.	6 flip-flops
D.	2 flip-flops

Answer: Option B

Explanation:

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44.

In a 6-bit Johnson counter sequence there are a total of how many states, or bit patterns?

A.	2
B.	6
C.	12
D.	24

Answer: Option C

Explanation:

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45.

To operate correctly, starting a ring shift counter requires:

A.	clearing all the flip-flops
B.	presetting one flip-flop and clearing all others
C.	clearing one flip-flop and presetting all others
D.	presetting all the flip-flops

Answer: Option B

Explanation:

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46.

What does the output enable do on the 74395A chip?

A.	It determines when data can be loaded.
B.	It forces all outputs to go HIGH.
C.	It forces all outputs to go LOW.
D.	It activates the three-state buffer.

Answer: Option B

Explanation:

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47.

What is meant by parallel load of a shift register?

A.	All FFs are preset with data.
B.	Each FF is loaded with data, one at a time.

Answer: Option A

Explanation:

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48.

How can parallel data be taken out of a shift register simultaneously?

A.	Use the Q output of the first FF.
B.	Use the Q output of the last FF.
C.	Tie all of the Q outputs together.
D.	Use the Q output of each FF.

Answer: Option D

Explanation:

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