# Logic Design Questions and Answers – Sequential Circuit Design Using FPGAs

This set of Logic Design Multiple Choice Questions & Answers (MCQs) focuses on “Sequential Circuit Design Using FPGAs”.

1. What is the full form of FPGA?
a) Functionally Programmable Gate Array
b) Functionally Programmed Gate Array
c) Field Programmable Gate Array
d) Field Programmable Gated Array

Explanation: Full form of FPGA is Field Programmable Gate Array. These circuits are built to be designed by the customers as per their requirements. Hence it is “field-programmable”.

2. Which one of the following best describes the FPGAs?
a) Array of CLBs surrounded by I/O ports
b) Array of logic gates surrounded by I/O ports
c) Different functional blocks followed by various registers and counters
d) A combination of memory blocks, registers and counters

Explanation: FPGAs usually contains an array of Configurable Logic Blocks (CLBs) surrounded by I/O ports. Hence the right answer is array of CLBs surrounded by I/O ports.

3. What are the contents of the CLBs of FPGAs?
a) Shift registers, counters and logic gates
b) Memory blocks, registers and D-CE flip-flops
c) Programmable multiplexers, function generators and D-CE flip-flops
d) Multiplexers, decoders and function generators

Explanation: A typical CLB contains two or more function generators, programmable multiplexers and D-CE flip-flops. Hence the correct option is programmable multiplexers, function generators and D-CE flip-flops.

4. Which of the following is used by the I/O blocks of an FPGA to drive the I/O pins?
a) D-flip-flops
b) Tri-state buffers
c) SR latches
d) Master-Slave flip-flops

Explanation: The I/O pins use tri-state buffers to drive the I/O pins of the I/O blocks of an FPGA. Hence the correct answer is the tri-state buffers.

5. Which one of the following is most appropriate for Computer Aided Design?
a) Ink-jet printer
b) Pen plotter
c) Graph plotter
d) Laser printer

Explanation: Pen plotter can be used manually by hand to plot any design on the screen. Hence it is more handy and easier to handle smaller designs. Hence Pen plotter is the right option.

6. Which of the following is used by computer for data processing?
a) DNC
b) CNC
c) NC
d) FNC

Explanation: CNC stands for Computerized Numerical Control. This device is used for processing a specific data to build a design. Hence the correct answer is CNC.

7. Which type of software is CAD?
a) Operating Software
b) System Software
c) Application Software
d) Programming Software

Explanation: Operating and system softwares are used to boot operating system that runs the machine. Programming softwares are used to run programming language. Hence CAD softwares are application software those are used for a specific design application.

8. Which of the following is the right code to draw a 4 inch line that is 60 degrees from the from the end point of the line created above the drafter?
a) @4 < 60
b) @4 / 60
c) &4 < 60
d) &4 / 60

Explanation: According to the codes and syntaxes of AutoCAD software, @4 < 60 is the right command to build draw a 4 inch line that is 60 degrees from the end point of the line created above the drafter. The other options are not in right syntax. Hence @4 < 60 is the right answer.

9. What is the full form of UCS in AutoCAD?
a) User Cooperation Server
b) User Controlled Server
c) User Coordinate System
d) User Controlled System

Explanation: UCS stands for User Coordinate System in AutoCAD. It is useful in 2D designing. User can select, move and rotate the UCS icon to change the current UCS.

10. Which of the following is related to a characteristic of FPGA?
a) PLD
b) EPROM
c) EEPROM
d) RAM

Explanation: Full form of FPGA is Field Programmable Gate Array. These circuits are built to be designed by the customers as per their requirements. Hence it is “field-programmable”. PLD means Programmable Logic Device. Hence, we can classify FPGAs as a PLD.

11. By which one of the following, the vertical and horizontal directions of an FPGA are separated?
a) Line
b) Channel
c) Strobe
d) Discs

Explanation: The FPGA refers to Field Programmable Gate Array. Field-Programmable Gate Arrays (FPGAs) are reprogrammable silicon chips. Vertical and horizontal directions is separated by a channel in an FPGA which determines the location of the output.

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