Combinational Logic Devices Questions with Answers

Combinational Logic Devices (PLDs) are used to perform logic functions without feedback paths. They include multiplexers, decoders, and encoders, which are key in designing digital systems. In competitive exams like GATE and PSU recruitments, logical reasoning questions and answers on combinational circuits test the understanding of logic simplification and output prediction. Practicing such problems enhances analytical ability and circuit comprehension, making it easier to handle advanced digital design questions with confidence.

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Which type of PLD should be used to program basic logic functions?

A PLA
B PAL
C CPLD
D SLD

Answer: Option B

The content of a simple programmable logic device (PLD) consists of:

A fuse-link arrays
B thousands of basic logic gates
C advanced sequential logic functions
D thousands of basic logic gates and advanced sequential logic functions

Answer: Option D

Once a PAL has been programmed:

A it cannot be reprogrammed.
B its outputs are only active HIGHs
C its outputs are only active LOWs
D its logic capacity is lost

Answer: Option A

PLAs, CPLDs, and FPGAs are all which type of device?

A SLD
B PLD
C EPROM
D SRAM

Answer: Option B

The difference between a PLA and a PAL is:

A the PLA has a programmable OR plane and a programmable AND plane, while the PAL only has a programmable AND plane
B the PAL has a programmable OR plane and a programmable AND plane, while the PLA only has a programmable AND plane
C the PAL has more possible product terms than the PLA
D PALs and PLAs are the same thing.

Answer: Option A

When referring to instruction words, a mnemonic is:

A a short abbreviation for the operand address
B a short abbreviation for the operation to be performed
C a short abbreviation for the data word stored at the operand address
D shorthand for machine language

Answer: Option B

What is the difference between mnemonic codes and machine codes?

A There is no difference.
B Machine codes are in binary, mnemonic codes are in shorthand English.
C Machine codes are in shorthand English, mnemonic codes are in binary.
D Machine codes are in shorthand English, mnemonic codes are a high-level language.

Answer: Option B

 Which bus is bidirectional?

A data bus
B control bus
C address bus
D multiplexed bus

Answer: Option A

The software used to drive microprocessor-based systems is called:

A assembly language programs
B firmware
C BASIC interpreter instructions
D flowchart instructions

Answer: Option A

Q10

A microprocessor unit, a memory unit, and an input/output unit form a:

A CPU
B compiler
C microcomputer
D ALU

Answer: Option C

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Combinational Logic Devices (PLD) Questions and Answers

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Combinational Logic Devices (PLD) Questions and Answers

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