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Combinational Logic Circuits (Electronics) Question and Answers-Page first

# Combinational Logic Circuits problems

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• 1. A magnitude comparator determines:

• Options
• A. A ≠ B and if A ɑ B or A >> B
• B. A ≈ B and if A > B or A < b
• C. A = B and if A > B or A < b
• D. A ≡ B and if A < b or a > B

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• 2. A basic multiplexer principle can be demonstrated through the use of a:

• Options
• A. single-pole relay
• B. DPDT switch
• C. rotary switch
• D. linear stepper

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• 3. Select one of the following statements that best describes the parity method of error detection:

• Options
• A. Parity checking is best suited for detecting single-bit errors in transmitted codes.
• B. Parity checking is best suited for detecting double-bit errors that occur during the transmission of codes from one location to another.
• C. Parity checking is not suitable for detecting single-bit errors in transmitted codes.
• D. Parity checking is capable of detecting and correcting errors in transmitted codes.

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• 4. Which digital system translates coded characters into a more intelligible form?

• Options
• A. encoder
• B. display
• C. counter
• D. decoder

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• 5. A multiplexed display:

• Options
• A. accepts data inputs from one line and passes this data to multiple output lines
• B. uses one display to present two or more pieces of information
• C. accepts data inputs from multiple lines and passes this data to multiple output lines
• D. accepts data inputs from several lines and multiplexes this input data to four BCD lines

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• 6. One application of a digital multiplexer is to facilitate:

• Options
• A. code conversion
• B. parity checking
• C. parallel-to-serial data conversion
• D. data generation

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• 7. Most demultiplexers facilitate which of the following?

• Options
• B. single input, multiple outputs
• C. ac to dc
• D. odd parity to even parity

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• 8. Which type of decoder will select one of sixteen outputs, depending on the 4-bit binary input value?

• Options
• B. dual octal outputs

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• 9. A circuit that responds to a specific set of signals to produce a related digital signal output is called a(n):

• Options
• A. BCD matrix
• B. display driver
• C. encoder
• D. decoder

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• 10. How many inputs are required for a 1-of-10 BCD decoder?

• Options
• A. 4
• B. 8
• C. 10
• D. 1

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