Question 1

A 16- input multiplexer is to be used to perform parallel- to- serial data conversion. Which of the following counters would be required to provide the data select inputs?

Accepted Answer

A)  MOD- 8 
B)  MOD- 2 
C)  MOD- 4 
D)  MOD- 16

Question 2

A certain BCD- to- decimal decoder has four input lines and 10 output lines. If four input lines are capable of 16 possible combinations and only 10 output combinations are required, why have four inputs?

Accepted Answer

A)  With three input lines the maximum number of output combinations would be equal to nine, including zero, and this would be sufficient, but decoders are not manufactured with only three inputs. 
B)  With four input lines, the decoder can provide for those rare occasions when input codes greater than 10012 may require decoding. 
C)  With three input lines the maximum number of output combinations would be limited to eight. 
D)  Both A and C

Question 3

The basic advantage of active- matrix displays over passive LCD displays is that active matrix displays have_____resolution and _____ response times.

Accepted Answer

A)  higher, shorter 
B)  lower, longer 
C)  lower, shorter 
D)  higher, longer

Question 4

As compared to regular registers, bidirectional registers generally have:

Accepted Answer

A)  a greater number of bus connections and separate I/O lines. 
B)  fewer bus corrections and separate I/O lines. 
C)  a greater number of bus connections and common I/O lines. 
D)  fewer bus connections and common I/O lines.

Question 5

Modern computers transfer data between different devices over a common set of connecting lines called a data bus.

Accepted Answer

A) True 
 B)False

Question 6

The parallel data from a branch bank's computer terminal is to be transferred over telephone lines to the main bank's computer. You would expect to find a______at the transmitting end and _____at the receiving end.

Accepted Answer

A)  multiplexer, demultiplexer 
B)  demultiplexer, multiplexer

Question 7

A _____comparator is a combinational logic circuit that compares two input binary quantities and generates outputs to indicate which one has the greater magnitude.

Accepted Answer

The answer of A _____comparator is a combinational logic circuit...

Question 8

An eight input multiplexer can easily be converted for use as a parallel to serial converter. What would be the appropriate way to sequence the data select inputs?

Accepted Answer

A)  Use a MOD 8 Asynchronous converter. 
B)  Use three Asynchronous FF's as converters. 
C)  Use three synchronous FF's as converters. 
D)  Both A and C

Question 9

All decoder inputs correspond to a decoder decimal equivalent output.

Accepted Answer

A) True 
 B)False

Question 10

Magnitude comparators compare a measured quantity to a _____value.

Accepted Answer

The answer of Magnitude comparators compare a measured quantity to...

Question 11

Circuits in the	_____logic family are generally used to drive LCDs.

Accepted Answer

The answer of Circuits in the	_____logic family are generally used...

Question 12

Decoders may at first appear to be quite difficult to understand but they are really quite simple. You need only remember:

Accepted Answer

A)  decoding is simply a procedure where each output line will be activated for only one of the possible combinations of inputs. 
B)  decoding is a complex operation that does not follow a set pattern. Consequently, the manufacturer's data sheet must be consulted for each possible input code group. 
C)  the inputs are always octal codes, therefore the output replicates the input. 
D)  decoding is totally random and completely accurate so the technician need not be concerned with how decoding is accomplished.

Question 13

The code conversion process for a two- digit BCD to binary converter would require _____ inputs and would have an output of _____binary bits.

Accepted Answer

A)  Four two bit code group, seven 
B)  Four two bit code group, six 
C)  Two four bit code group, six 
D)  Two four bit code group, seven

Question 14

Hi- Z or _____state buffers data bus from register, ADCs, DACs, and other devices.

Accepted Answer

The answer of Hi- Z or _____state buffers data bus...

Question 15

LCD displays require less current than LEDs.

Accepted Answer

A) True 
 B)False

Question 16

Multiplexing of digital signals is usually required when:

Accepted Answer

A)  moving data over long distance transmission lines. 
B)  moving data internally within a microprocessor. 
C)  moving data between memory and storage registers in a microprocessor. 
D)  Both A and C

Question 17

A _____is a logic circuit that accepts a set of inputs which represents a binary number, and activates only the output that corresponds to that input number.

Accepted Answer

The answer of A _____is a logic circuit that accepts...

Question 18

Incandescent 7- segment displays are especially well suited for use in portable battery- operated devices.

Accepted Answer

A) True 
 B)False

Exam 9: MSI Logic Circuits

A 16- input multiplexer is to be used to perform parallel- to- serial data conversion. Which of the following counters would be required to provide the data select inputs?

A certain BCD- to- decimal decoder has four input lines and 10 output lines. If four input lines are capable of 16 possible combinations and only 10 output combinations are required, why have four inputs?

The basic advantage of active- matrix displays over passive LCD displays is that active matrix displays have_resolution and _ response times.

As compared to regular registers, bidirectional registers generally have:

Modern computers transfer data between different devices over a common set of connecting lines called a data bus.

The parallel data from a branch bank's computer terminal is to be transferred over telephone lines to the main bank's computer. You would expect to find a__at the transmitting end and _at the receiving end.

A _____comparator is a combinational logic circuit that compares two input binary quantities and generates outputs to indicate which one has the greater magnitude.

An eight input multiplexer can easily be converted for use as a parallel to serial converter. What would be the appropriate way to sequence the data select inputs?

All decoder inputs correspond to a decoder decimal equivalent output.

Magnitude comparators compare a measured quantity to a _____value.

Circuits in the _____logic family are generally used to drive LCDs.

Decoders may at first appear to be quite difficult to understand but they are really quite simple. You need only remember:

The code conversion process for a two- digit BCD to binary converter would require _ inputs and would have an output of _binary bits.

Hi- Z or _____state buffers data bus from register, ADCs, DACs, and other devices.

LCD displays require less current than LEDs.

Multiplexing of digital signals is usually required when:

A _____is a logic circuit that accepts a set of inputs which represents a binary number, and activates only the output that corresponds to that input number.

Incandescent 7- segment displays are especially well suited for use in portable battery- operated devices.