Digital Circuits Questions and Answers – Registers

This set of Digital Electronics/Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Registers”.

1. A register is defined as ___________
a) The group of latches for storing one bit of information
b) The group of latches for storing n-bit of information
c) The group of flip-flops suitable for storing one bit of information
d) The group of flip-flops suitable for storing binary information
View Answer

Answer: d
Explanation: A register is defined as the group of flip-flops suitable for storing binary information. Each flip-flop is a binary cell capable of storing one bit of information. The data in a register can be transferred from one flip-flop to another.

2. The register is a type of ___________
a) Sequential circuit
b) Combinational circuit
c) CPU
d) Latches
View Answer

Answer: a
Explanation: Register’s output depends on the past and present states of the inputs. The device which follows these properties is termed as a sequential circuit. Whereas, combinational circuits only depend on the present values of inputs.

3. How many types of registers are?
a) 2
b) 3
c) 4
d) 5
View Answer

Answer: c
Explanation: There are 4 types of shift registers, viz., Serial-In/Serial-Out, Serial-In/Parallel-Out, Parallel-In/Serial-Out and Parallel-In/Parallel-Out.
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4. The main difference between a register and a counter is ___________
a) A register has no specific sequence of states
b) A counter has no specific sequence of states
c) A register has capability to store one bit of information but counter has n-bit
d) A register counts data
View Answer

Answer: a
Explanation: The main difference between a register and a counter is that a register has no specific sequence of states except in certain specialised applications.

5. In D register, ‘D’ stands for ___________
a) Delay
b) Decrement
c) Data
d) Decay
View Answer

Answer: c
Explanation: D stands for “data” in case of flip-flops and not delay. Registers are made of a group of flip-flops.
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6. Registers capable of shifting in one direction is ___________
a) Universal shift register
b) Unidirectional shift register
c) Unipolar shift register
d) Unique shift register
View Answer

Answer: b
Explanation: The register capable of shifting in one direction is unidirectional shift register. The register capable of shifting in both directions is known as a bidirectional shift register.

7. A register that is used to store binary information is called ___________
a) Data register
b) Binary register
c) Shift register
d) D – Register
View Answer

Answer: b
Explanation: A register that is used to store binary information is called a binary register. A register in which data can be shifted is called shift register.
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8. A shift register is defined as ___________
a) The register capable of shifting information to another register
b) The register capable of shifting information either to the right or to the left
c) The register capable of shifting information to the right only
d) The register capable of shifting information to the left only
View Answer

Answer: b
Explanation: The register capable of shifting information either to the right or to the left is termed as shift register. A register in which data can be shifted only in one direction is called unidirectional shift register, while if data can shifted in both directions, it is known as a bidirectional shift register.

9. How many methods of shifting of data are available?
a) 2
b) 3
c) 4
d) 5
View Answer

Answer: a
Explanation: There are two types of shifting of data are available and these are serial shifting & parallel shifting.
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10. In serial shifting method, data shifting occurs ____________
a) One bit at a time
b) simultaneously
c) Two bit at a time
d) Four bit at a time
View Answer

Answer: a
Explanation: As the name suggests serial shifting, it means that data shifting will take place one bit at a time for each clock pulse in a serial fashion. While in parallel shifting, shifting will take place with all bits simultaneously for each clock pulse in a parallel fashion.

Sanfoundry Global Education & Learning Series – Digital Circuits.

To practice all areas of Digital Circuits, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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