Combinational Logic Circuits MCQs
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A basic multiplexer principle can be demonstrated through the use of a:
- A. single-pole relay
- B. DPDT switch
- C. rotary switch
- D. linear stepper
- Correct Answer: Option C
A circuit that responds to a specific set of signals to produce a related digital signal output is called a(n):
- A. BCD matrix
- B. display driver
- C. encoder
- D. decoder
- Correct Answer: Option C
A code in which each individual digit of a decimal number is represented by a 4-bit binary number is _________.
- A. binary coded decimal
- B. binary
- C. hexadecimal
- D. seven-segment code
- Correct Answer: Option A
A device that uses a binary decoder to direct a digital signal from a single source to one of several destinations is a ________.
- A. multiplexer
- B. demultiplexer
- C. encoder
- D. comparator
- Correct Answer: Option B
A multiplexed display:
- 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
- Correct Answer: Option B
A technique that can be used in multiple-digit numerical displays to control suppression or display of leading or trailing zeros in the display is called _________.
- A. advanced zero control
- B. time division multiplexing
- C. parity generation
- D. ripple blanking
- Correct Answer: Option D
How many inputs are required for a 1-of-10 BCD decoder?
- A. 4
- B. 8
- C. 10
- D. 1
- Correct Answer: Option A
In a BCD-to-seven-segment converter, why must a code converter be utilized?
- A. No conversion is necessary.
- B. to convert the 4-bit BCD into gray code
- C. to convert the 4-bit BCD into 10-bit code
- D. to convert the 4-bit BCD into 7-bit code
- Correct Answer: Option D
Most demultiplexers facilitate which of the following?
- A. decimal to hexadecimal
- B. single input, multiple outputs
- C. ac to dc
- D. odd parity to even parity
- Correct Answer: Option B
One application of a digital multiplexer is to facilitate:
- A. code conversion
- B. parity checking
- C. parallel-to-serial data conversion
- D. data generation
- Correct Answer: Option C
Parity systems are defined as either_____ or _____ and will add an extra _____ to the digital information being transmitted.
- A. positive, negative, byte
- B. odd, even, bit
- C. upper, lower, digit
- D. on, off, decimal
- Correct Answer: Option B
Select one of the following statements that best describes the parity method of error detection:
- 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.
- Correct Answer: Option A
The diodes in a seven-segment display where all cathodes are tied together and grounded are illuminated when a logic ____________________ is applied to the ____________________.
- A. LOW, anodes
- B. LOW, count down control line
- C. HIGH, anode
- D. HIGH, count up control line
- Correct Answer: Option C
When two or more inputs are active simultaneously, the process is called:
- A. first-in, first-out processing
- B. priority encoding
- C. ripple blanking
- D. priority decoding
- Correct Answer: Option B
Which digital system translates coded characters into a more intelligible form?
- A. encoder
- B. display
- C. counter
- D. decoder
- Correct Answer: Option D
Which type of decoder will select one of sixteen outputs, depending on the 4-bit binary input value?
- A. hexadecimal
- B. dual octal outputs
- C. binary-to-hexadecimal
- D. hexadecimal-to-binary
- Correct Answer: Option A