Question 1

In the event that a 9 and a 1 were entered simultaneously, a _____encoder would encode only the 9.

Accepted Answer

priority

Question 2

A three- line- to- eight line decoder has inputs CBA where A is the LSB. The output AND gates are labeled Q0 through Q7. The output of AND gate Q4 should be active when the inputs are:

Accepted Answer

A)   0 through Q7. The output of AND gate Q4 should be active when the inputs are: 
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C)     
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B)   0 through Q7. The output of AND gate Q4 should be active when the inputs are: 
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C)     
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C)   0 through Q7. The output of AND gate Q4 should be active when the inputs are: 
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D)  0 through Q7. The output of AND gate Q4 should be active when the inputs are: 
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Question 3

A demultiplexer accepts data from:

Accepted Answer

A)   multiple input lines and transfers it to one output line.
B)   sequential input lines and transfers it to one output line.
C)   one input line and transfers it to one output line after conditioning and buffering the data signals.
D)   one input line and transfers it to multiple output lines. D

Question 4

Common anode seven segment displays could be considered active high loads.

Accepted Answer

A) True 
 B)False

Question 5

A(n) _____	has a number of input lines, only one of which is activated at a given time, and produces an N- bit output code, depending on which input is activated.

Accepted Answer

The answer of A(n) _____	has a number of input lines,...

Question 6

A numeric display - driven by a 744X driver - is used to display the output from a BCD counter. If this counter only displays the numbers 0, 2, 4, 6, and 8, then troubleshooting should be narrowed down to:

Accepted Answer

A)   the "b", "c", and "d" segments on the numeric display.
B)   the MSB line on the display input circuit.
C)   the MSB line on the driver input circuit.
D)   the LSB line on the display input circuit.
E)   the LSB line on the driver input circuit.

Question 7

More than one active input to an encoder will often produce an erroneous output. This problem may be partially overcome by the use of:

Accepted Answer

A)   an open- collector NAND gate whose inputs are connected to the decoder's outputs.
B)   an additional encoder whose inputs are cascaded to the original decoder's outputs.
C)   a priority encoder to ensure that when more than one input is active the output will correspond to the lowest- numbered input.
D)   a priority encoder to ensure that when more than one input is active the output will correspond to the highest- numbered input.

Question 8

Magnitude comparators are useful for speed control, temperature control, and level control. After these analog quantities are sampled:

Accepted Answer

A)   quantities are permanently stored in memory location.
B)   quantities are converted to binary equivalent.
C)   quantities are converted to a constant current source.
D)   quantities are converted to equivalent frequency through another converter.

Question 9

A digital_____or data selector is a logic circuit that accepts several digital data inputs and selects one of them at any given time to pass on to the output.

Accepted Answer

The answer of A digital_____or data selector is a logic...

Question 10

The relatively slow transition time of data on bus lines may be attributed directly to capacitive loading of the lines.

Accepted Answer

A) True 
 B)False

Question 11

The IEEE/ANSI symbol for a decoder has the internal designation BCD/DEC, how many pins; including Vcc and ground, would this IC have?

Accepted Answer

A)   18
B)   14
C)   16
D)   20

Question 12

Number system conversion can be accomplished using encoders.

Accepted Answer

A) True 
 B)False

Question 13

A(n)	_____display controls the reflection of available light.

Accepted Answer

The answer of A(n)	_____display controls the reflection of available light....

Question 14

The select inputs to a multiplexer may also be called address lines.

Accepted Answer

A) True 
 B)False

Question 15

A demultiplexer does not use an OR gate as the output gate because of the multiple output lines.

Accepted Answer

A) True 
 B)False

Question 16

LCD displays are more visible in low light conditions than LED displays.

Accepted Answer

A) True 
 B)False

Question 17

It is normal for more than one decoder output to be active at the same time.

Accepted Answer

A) True 
 B)False

Question 18

Basically, a multiplexer changes parallel data inputs to a serial output.

Accepted Answer

A) True 
 B)False

Question 19

Approximately how much current would be required to operate the number 6 on a 7- segment LED display if each segment requires 10 mA?

Accepted Answer

A)   70 mA
B)   60 mA
C)   40 mA
D)   50 mA

Question 20

A multiplexer/data selector is a logic circuit that:

Accepted Answer

A)   accepts data inputs from multiple lines and passes this data to multiple output lines.
B)   accepts data inputs from several lines and multiplexes this input data to four BCD lines.
C)   accepts data inputs from one line and passes this data to multiple output lines.
D)   accepts data inputs from several lines and allows one of them at a time to pass to the output.

Exam 9: MSI Logic Circuits

In the event that a 9 and a 1 were entered simultaneously, a _____encoder would encode only the 9.

A three- line- to- eight line decoder has inputs CBA where A is the LSB. The output AND gates are labeled Q₀through Q₇. The output of AND gate Q₄should be active when the inputs are:

A demultiplexer accepts data from:

Common anode seven segment displays could be considered active high loads.

A(n) _____ has a number of input lines, only one of which is activated at a given time, and produces an N- bit output code, depending on which input is activated.

A numeric display - driven by a 744X driver - is used to display the output from a BCD counter. If this counter only displays the numbers 0, 2, 4, 6, and 8, then troubleshooting should be narrowed down to:

More than one active input to an encoder will often produce an erroneous output. This problem may be partially overcome by the use of:

Magnitude comparators are useful for speed control, temperature control, and level control. After these analog quantities are sampled:

A digital_____or data selector is a logic circuit that accepts several digital data inputs and selects one of them at any given time to pass on to the output.

The relatively slow transition time of data on bus lines may be attributed directly to capacitive loading of the lines.

The IEEE/ANSI symbol for a decoder has the internal designation BCD/DEC, how many pins; including V_ccand ground, would this IC have?

Number system conversion can be accomplished using encoders.

A(n) _____display controls the reflection of available light.

The select inputs to a multiplexer may also be called address lines.

A demultiplexer does not use an OR gate as the output gate because of the multiple output lines.

LCD displays are more visible in low light conditions than LED displays.

It is normal for more than one decoder output to be active at the same time.

Basically, a multiplexer changes parallel data inputs to a serial output.

Approximately how much current would be required to operate the number 6 on a 7- segment LED display if each segment requires 10 mA?

A multiplexer/data selector is a logic circuit that: