Combinational Logic Circuits

Q1: A magnitude comparator determines:

A
A notequalto.gif B and if A alpha.gif B or A >> B

B
A almostequal.gif B and if A > B or A < b

C
A = B and if A > B or A < b

D
A identicalto.gif B and if A < b or a > B

Q2: 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

Q3: 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

Q4: 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

Q5: 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

Q6: 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

Q7: 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

Q8: 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.

Q9: Which digital system translates coded characters into a more intelligible form?

A encoder

B display

C counter

D decoder

Q10: One application of a digital multiplexer is to facilitate:

A code conversion

B parity checking

C parallel-to-serial data conversion

D data generation

Q11: 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

Q12: How many inputs are required for a 1-of-10 BCD decoder?

A 4

B 8

C 10

D 1


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