Digital Principles and System Design MCQs with answers Page - 14

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Q. How many OR gates are required for a Decimal-to- bcd encoder?

• (A) 2
• (B) 10
• (C) 3
• (D) 4

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Correct answer - Option (D)

Explanation:

an encoder is a combinational circuit encoding the information of 2^n input lines to n output lines, thus producing the binary equivalent of the input.

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Q. How many OR gates are required for an octal-to- binary encoder?

• (A) 3
• (B) 2
• (C) 8
• (D) 10

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Correct answer - Option (A)

Explanation:

an encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. thus, in octal to binary encoder there are 8 (=23) inputs, thus 3 output lines.

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Q. The discrepancy of 0 output due to all inputs being 0 or D0, being 0 is resolved by using additional input known as

• (A) enable
• (B) disable
• (C) strobe
• (D) clock

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Correct answer - Option (A)

Explanation:

such problems are resolved by using enable input, which behaves as active if it gets 0 as input since it is an active-low pin.

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Q. Can an encoder be called as multiplexer?

• (A) no
• (B) yes
• (C) sometimes
• (D) never

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Correct answer - Option (B)

Explanation:

a multiplexer or mux is a combination circuit that contains more than one input line, one output line and more than one selection line. whereas, an encoder is also considered a type of multiplexer but without a single output line and without any selection lines.

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Q. If two inputs are active on a priority encoder, which will be coded on the output?

• (A) the higher value
• (B) the lower value
• (C) neither of the inputs
• (D) both of the inputs

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Correct answer - Option (A)

Explanation:

an encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. if two inputs are active on a priority encoder, the input of higher value will be coded in the output.

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Q. What is a multiplexer?

• (A) it is a type of decoder which decodes several inputs and gives one output
• (B) a multiplexer is a device which converts many signals into one
• (C) it takes one input and results into many output
• (D) it is a type of encoder which decodes several inputs and gives one output

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Correct answer - Option (B)

Explanation:

a multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line, depending on the active select lines.

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Q. Which combinational circuit is renowned for selecting a single input from multiple inputs & directing the binary information to output line?

• (A) data selector
• (B) data distributor
• (C) both data selector and data distributor
• (D) demultiplexer

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Correct answer - Option (A)

Explanation:

data selector is another name of multiplexer. a multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line, depending on the active select lines.

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Q. It is possible for an enable or strobe input to undergo an expansion of two or more MUX ICs to the digital multiplexer with the proficiency of large number of

• (A) inputs
• (B) outputs
• (C) selection lines
• (D) enable lines

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Correct answer - Option (A)

Explanation:

it is possible for an enable or strobe input to undergo an expansion of two or more mux ics to the digital multiplexer with the proficiency of large number of inputs.

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Q. Which is the major functioning responsibility of the multiplexing combinational circuit?

• (A) decoding the binary information
• (B) generation of all minterms in an output function with or-gate
• (C) generation of selected path between multiple sources and a single destination
• (D) encoding of binary information

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Correct answer - Option (C)

Explanation:

the major functioning responsibility of the multiplexing combinational circuit is generation of selected path between multiple sources and a single destination because it makes the circuit too flexible. a multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line, depending on the active select lines.

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Q. What is the function of an enable input on a multiplexer chip?

• (A) to apply vcc
• (B) to connect ground
• (C) to active the entire chip
• (D) to active one half of the chip

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Correct answer - Option (C)

Explanation:

enable input is used to active the chip, when enable is high the chip works (active), when enable is low the chip does not work (memory).

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