Question 1

‪ 
-The logic expression for the Karnaugh map in Figure 9- 7 is ________.

Accepted Answer

A)   
B)   
C)   
D)   E) A) and B)
F) All of the above

Question 2

Most sequential circuits contain a combinational logic section and a memory section.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following statements is true?

Accepted Answer

A)   Asynchronous events are controlled by a clock.
B)   Synchronous events do not need a clock to control them.
C)   Only asynchronous events need a control clock.
D)   Asynchronous events occur independently of the circuit clock.E) All of the above
F) A) and B)

Question 4

‪ 
-The table shown in Figure 9- 6 is called a ________	.

Accepted Answer

A)   sequential truth table
B)   present state table
C)   state diagram
D)   next- state tableE) B) and C)
F) A) and D)

Question 5

The output from a Mealy state machine depends on its internal state and on external inputs.

Accepted Answer

A) True 
 B)False

Question 6

‪ 
-Referring to the waveforms in Figure 9- 3, what is the decimal count at point 'X'?

Accepted Answer

A)   7
B)   0110
C)   4
D)   11E) A) and D)
F) A) and C)

Question 7

The dot extension .CLK is used to indicate that the register device is a clocked flip- flop.

Accepted Answer

A) True 
 B)False  True

Question 8

Counters are generally decoded in order to determine their count state.

Accepted Answer

A) True 
 B)False

Question 9

‪ 
-What is the modulus of the counter shown in Figure 9- 9?

Accepted Answer

A)   0.005
B)   5000
C)   19
D)   200E) C) and D)
F) A) and B)

Question 10

‪ 
-Refer to Figure 9- 8. What value should 'X' represent in the state table?

Accepted Answer

A)   1
B)   0C) A) and B)
D) undefined

Question 11

A Moore state machine does not have a clock input.

Accepted Answer

A) True 
 B)False  False

Question 12

The term synchronous as applied to counter operations means that the counter is clocked so that each flip- flop in the counter is triggered at the same time.

Accepted Answer

A) True 
 B)False

Question 13

A state machine has a finite number of states that occur in random order.

Accepted Answer

A) True 
 B)False

Question 14

‪ 
-One of the most common and least expensive crystals available is the 3.58 MHz crystal used in color television sets. What hex value would have to be loaded into the counter in Figure 9- 12 in order to use the 3.58 MHz crystal to derive the 60Hz reference signal for the clock?

Accepted Answer

A)   E912
B)   63C0
C)   16ED
D)   E3C0E) A) and B)
F) C) and D)

Question 15

‪ 
-Refer to Figure 9- 11. The TC output of CTR0 shorts to ground; what will be the output frequency at 'X'?

Accepted Answer

A)   50 kHz
B)   0 Hz
C)   500 kHz
D)   5 kHzE) B) and D)
F) A) and D)

Question 16

‪ 
-Refer to Figure 9- 11. The output of the counter is checked and found to be 50 kHz. Is the counter working correctly? If not, what could be wrong?

Accepted Answer

A)   The counter is defective; there is probably a bad connection on the CTEN terminal of CTR0.
B)   The counter is defective; an open exists somewhere between TC of CTR0 and CTEN of CTR1.
C)   The counter is working correctly.
D)   The counter is not working correctly; the TC of CTR1 is probably shorted to ground.E) A) and C)
F) None of the above B

Question 17

‪ 
-Which of the following statements is correct concerning Figure 9- 4?

Accepted Answer

A)   Both the ENP and ENT terminals must be HIGH in order for the counter to cycle on the leading edge of the CLK input.
B)   Both the active- LOW CLR and LOAD inputs must be LOW in order for the counter to cycle.
C)   When the CLK input goes HIGH, the data on the DATA INPUT terminals is passed through to the DATA OUTPUT terminals.
D)   The active- HIGH ENT and ENP inputs must be HIGH, while the active- LOW CLR and LOAD inputs must be LOW in order for the counter to cycle.E) A) and D)
F) All of the above

Question 18

‪ 
-An oscilloscope indicates that the circuit in Figure 9- 1 has no Q1 output signal. All J- K inputs are HIGH, the CLK signal is present and Q0 is toggling. The C input of FF1 is a constant LOW. What could be causing the problem?

Accepted Answer

A)   The Q0 output should be connected to the J input of FFl.
B)   The input of FF1 may be shorted to ground.
C)   The output of FF0 may be shorted to ground.
D)   The problem could be caused by either B or C.E) A) and B)
F) A) and C)

Question 19

‪ 
-What value does 'Z' represent in Figure 9- 8?

Accepted Answer

A)   111
B)   3
C)   5
D)   4E) All of the above
F) C) and D)

Question 20

Which type of state machine has a clock input?

Accepted Answer

A)   Moore
B)   State machines do not have clock inputs.
C)   Mealy
D)   Moore and MealyE) B) and C)
F) None of the above

Exam 9: Counters

‪ -The logic expression for the Karnaugh map in Figure 9- 7 is ________.

Correct AnswerverifiedShow Answer

Most sequential circuits contain a combinational logic section and a memory section.

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

‪ -The table shown in Figure 9- 6 is called a ________ .

Correct AnswerverifiedShow Answer

The output from a Mealy state machine depends on its internal state and on external inputs.

Correct AnswerverifiedShow Answer

‪ -Referring to the waveforms in Figure 9- 3, what is the decimal count at point 'X'?

Correct AnswerverifiedShow Answer

The dot extension .CLK is used to indicate that the register device is a clocked flip- flop.

Correct AnswerverifiedTrue

Counters are generally decoded in order to determine their count state.

Correct AnswerverifiedShow Answer

‪ -What is the modulus of the counter shown in Figure 9- 9?

Correct AnswerverifiedShow Answer

‪ -Refer to Figure 9- 8. What value should 'X' represent in the state table?

Correct AnswerverifiedShow Answer

A Moore state machine does not have a clock input.

Correct AnswerverifiedFalse

The term synchronous as applied to counter operations means that the counter is clocked so that each flip- flop in the counter is triggered at the same time.

Correct AnswerverifiedShow Answer

A state machine has a finite number of states that occur in random order.

Correct AnswerverifiedShow Answer

‪ -One of the most common and least expensive crystals available is the 3.58 MHz crystal used in color television sets. What hex value would have to be loaded into the counter in Figure 9- 12 in order to use the 3.58 MHz crystal to derive the 60Hz reference signal for the clock?

Correct AnswerverifiedShow Answer

‪ -Refer to Figure 9- 11. The TC output of CTR0 shorts to ground; what will be the output frequency at 'X'?

Correct AnswerverifiedShow Answer

‪ -Refer to Figure 9- 11. The output of the counter is checked and found to be 50 kHz. Is the counter working correctly? If not, what could be wrong?

Correct AnswerverifiedB

‪ -Which of the following statements is correct concerning Figure 9- 4?

Correct AnswerverifiedShow Answer

‪ -An oscilloscope indicates that the circuit in Figure 9- 1 has no Q1 output signal. All J- K inputs are HIGH, the CLK signal is present and Q0 is toggling. The C input of FF1 is a constant LOW. What could be causing the problem?

Correct AnswerverifiedShow Answer

‪ -What value does 'Z' represent in Figure 9- 8?

Correct AnswerverifiedShow Answer

Which type of state machine has a clock input?

Correct AnswerverifiedShow Answer

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True

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False

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B

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