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Combinational Logic Circuits Online Exam Quiz

Important questions about Combinational Logic Circuits. Combinational Logic Circuits MCQ questions with answers. Combinational Logic Circuits exam questions and answers for students and interviews.

1. When two or more inputs are active simultaneously, the process is called:

Options

A : first-in, first-out processing

B : priority encoding

C : ripple blanking

D : priority decoding

2. In a BCD-to-seven-segment converter, why must a code converter be utilized?

Options

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

3. A magnitude comparator outputs the highest or lowest value of its inputs depending on control signals.

Options

A : True

B : False

C :

D :

4. A decoder with two inputs will have two outputs for the decoded value.

Options

A : True

B : False

C :

D :

5. A multiplexer is a device that chooses which output to send an input to by means of select lines.

Options

A : True

B : False

C :

D :

6. Parity checking can only detect an odd number of errors.

Options

A : True

B : False

C :

D :

7. An encoder circuit is designed to generate specific codes.

Options

A : True

B : False

C :

D :

8. An AND gate and two INVERTERs can be connected to act as a basic decoder.

Options

A : True

B : False

C :

D :

9. A multiplexer is a device that outputs a fixed sequence of binary states on each clock pulse.

Options

A : True

B : False

C :

D :

10. The general function of a decoder is to activate one or more circuit outputs upon detection of a particular digital state.

Options

A : True

B : False

C :

D :

1. A hexadecimal decoder selects one of sixteen outputs depending on the 8-bit binary input applied.

Options

A : True

B : False

C :

D :

2. A sixteen-input multiplexer will need three data select input control lines.

Options

A : True

B : False

C :

D :

1. A magnitude comparator determines:

Options

A : A ? B and if A ? 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

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.

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

Options

A : encoder

B : display

C : counter

D : decoder

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

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

7. Most demultiplexers facilitate which of the following?

Options

A : decimal to hexadecimal

B : single input, multiple outputs

C : ac to dc

D : odd parity to even parity

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

Options

A : hexadecimal

B : dual octal outputs

C : binary-to-hexadecimal

D : hexadecimal-to-binary

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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