Question 1

‪  
-Which of the waveforms shown in Figure 9- 2 represents the output of FF2?

Accepted Answer

A)  Waveform a 
B)  Waveform b 
C)  Waveform c 
D)  Waveform d 
A)  Waveform a 
B)  Waveform b 
C)  Waveform c 
D)  Waveform d

Question 2

‪  
-The illustration shown in Figure 9- 6 is referred to as a _________.

Accepted Answer

A)  state diagram 
B)  clock diagram 
C)  sequential diagram 
D)  cyclic state chart 
A)  state diagram 
B)  clock diagram 
C)  sequential diagram 
D)  cyclic state chart

Question 3

‪  
-During period D on the timing diagram in Figure 9- 5, the decimal count sequence is ________ .

Accepted Answer

A)  1, 0, 9, 8 
B)  7, 8, 9, 1 
C)  8, 9, 0, 1 
D)  0, 1, 9, 8 
A)  1, 0, 9, 8 
B)  7, 8, 9, 1 
C)  8, 9, 0, 1 
D)  0, 1, 9, 8

Question 4

‪  
-If the diagram shown in Figure 9- 6 represents a three- bit Gray code counter, what binary value would exist at 'X'?

Accepted Answer

A)  110 
B)  101 
C)  011 
D)  010 
A)  110 
B)  101 
C)  011 
D)  010

Question 5

In many cases, counters must be strobed in order to eliminate glitches.

Accepted Answer

A) True 
 B)False

Question 6

‪  
-What function does the counter shown in Figure 9- 5 perform during period B on the timing diagram?

Accepted Answer

A)  Loading 
B)  Inhibited 
C)  Counting down 
D)  Counting up 
A)  Loading 
B)  Inhibited 
C)  Counting down 
D)  Counting up

Question 7

‪  
-What is the significance of the Xs in the Karnaugh map shown in Figure 9- 7?

Accepted Answer

A)  They must all be grouped together to form an output equation. 
B)  They can represent either ones or zeroes, as long as they are all the same. 
C)  They represent 'don't care' states. 
D)  They may be grouped with either the ones or the zeroes in the Karnaugh map. 
A)  They must all be grouped together to form an output equation. 
B)  They can represent either ones or zeroes, as long as they are all the same. 
C)  They represent 'don't care' states. 
D)  They may be grouped with either the ones or the zeroes in the Karnaugh map.

Question 8

‪  
-The counter shown in Figure 9- 1 is a(n) __________ counter, and the correct output waveform for Q1 is__________ .

Accepted Answer

A)  synchronous, Q1a 
B)  asynchronous, Q1b 
C)  asynchronous, Q1c 
D)  synchronous, Q1d 
A)  synchronous, Q1a 
B)  asynchronous, Q1b 
C)  asynchronous, Q1c 
D)  synchronous, Q1d

Question 9

‪  
-Refer to Figure 9- 12. The circuit is used to derive a 60 Hz reference for a digital clock. After running for 24 hours the clock appears to be running 2 minutes and 18 seconds slow. What appears to be wrong with the circuit?

Accepted Answer

A)  The error is very small and is to be expected of a circuit of this type; the clock should be regularly reset. 
B)  The modulus of the counter has decreased, causing the counter to produce a lower output reference signal for the clock. 
C)  The modulus of the counter has increased, causing a drop in the output frequency of the counter. 
D)  The XTAL OSC is probably cooling off too much at night and consequently slowing down; the XTAL OSC should be temperature compensated. 
A)  The error is very small and is to be expected of a circuit of this type; the clock should be regularly reset. 
B)  The modulus of the counter has decreased, causing the counter to produce a lower output reference signal for the clock. 
C)  The modulus of the counter has increased, causing a drop in the output frequency of the counter. 
D)  The XTAL OSC is probably cooling off too much at night and consequently slowing down; the XTAL OSC should be temperature compensated.

Question 10

‪  
-The circuit in Figure 9- 11 is used for _________ and for the inputs shown, the DATA OUT will be _________ .

Accepted Answer

A)  parallel- to- serial conversion, HIGH 
B)  demultiplexing, 0 
C)  multiplexing, 1 
D)  parallel- to- serial conversion, 0 
A)  parallel- to- serial conversion, HIGH 
B)  demultiplexing, 0 
C)  multiplexing, 1 
D)  parallel- to- serial conversion, 0

‪ -Which of the waveforms shown in Figure 9- 2 represents the output of FF2?

‪ -The illustration shown in Figure 9- 6 is referred to as a _________.

‪ -During period D on the timing diagram in Figure 9- 5, the decimal count sequence is ________ .

‪ -If the diagram shown in Figure 9- 6 represents a three- bit Gray code counter, what binary value would exist at 'X'?

In many cases, counters must be strobed in order to eliminate glitches.

‪ -What function does the counter shown in Figure 9- 5 perform during period B on the timing diagram?

‪ -What is the significance of the Xs in the Karnaugh map shown in Figure 9- 7?

‪ -The counter shown in Figure 9- 1 is a(n) counter, and the correct output waveform for Q₁ is .

‪ -Refer to Figure 9- 12. The circuit is used to derive a 60 Hz reference for a digital clock. After running for 24 hours the clock appears to be running 2 minutes and 18 seconds slow. What appears to be wrong with the circuit?

‪ -The circuit in Figure 9- 11 is used for _ and for the inputs shown, the DATA OUT will be _ .

Introductory Concepts

Number Systems, Operations, and Codes

Logic Gates

Boolean Algebra and Logic Simplification

Combinational Logic Analysis

Functions of Combinational Logic

Latches, Flip-Flops, and Timers

Shift Registers

Programmable Logic

Data Storage

Signal Conversion and Processing

Data Transmission

Data Processing and Control

Integrated Circuit Technologies

Filters

Exam 9: Counters

‪ -Which of the waveforms shown in Figure 9- 2 represents the output of FF2?

‪ -The illustration shown in Figure 9- 6 is referred to as a _________.

‪ -During period D on the timing diagram in Figure 9- 5, the decimal count sequence is ________ .

‪ -If the diagram shown in Figure 9- 6 represents a three- bit Gray code counter, what binary value would exist at 'X'?

In many cases, counters must be strobed in order to eliminate glitches.

‪ -What function does the counter shown in Figure 9- 5 perform during period B on the timing diagram?

‪ -What is the significance of the Xs in the Karnaugh map shown in Figure 9- 7?

‪ -The counter shown in Figure 9- 1 is a(n) __________ counter, and the correct output waveform for Q1 is__________ .

‪ -Refer to Figure 9- 12. The circuit is used to derive a 60 Hz reference for a digital clock. After running for 24 hours the clock appears to be running 2 minutes and 18 seconds slow. What appears to be wrong with the circuit?

‪ -The circuit in Figure 9- 11 is used for _________ and for the inputs shown, the DATA OUT will be _________ .

Introductory Concepts

Number Systems, Operations, and Codes

Logic Gates

Boolean Algebra and Logic Simplification

Combinational Logic Analysis

Functions of Combinational Logic

Latches, Flip-Flops, and Timers

Shift Registers

Programmable Logic

Data Storage

Signal Conversion and Processing

Data Transmission

Data Processing and Control

Integrated Circuit Technologies

Filters

‪ -The counter shown in Figure 9- 1 is a(n) counter, and the correct output waveform for Q₁ is .

‪ -The circuit in Figure 9- 11 is used for _ and for the inputs shown, the DATA OUT will be _ .