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‪ ‪ -What function does the counter shown in Figure 9- 5 perform during period B on the timing diagram? A) Loading B) Inhibited C) Counting down D) Counting up -What function does the counter shown in Figure 9- 5 perform during period B on the timing diagram?


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

E) A) and C)
F) B) and D)

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‪ ‪ -During period D on the timing diagram in Figure 9- 5, the decimal count sequence is ________ . A) 1, 0, 9, 8 B) 7, 8, 9, 1 C) 8, 9, 0, 1 D) 0, 1, 9, 8 -During period D on the timing diagram in Figure 9- 5, the decimal count sequence is ________ .


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

E) B) and C)
F) A) and C)

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‪ ‪ -The illustration shown in Figure 9- 6 is referred to as a _________. A) state diagram B) clock diagram C) sequential diagram D) cyclic state chart -The illustration shown in Figure 9- 6 is referred to as a _________.


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

E) B) and D)
F) A) and D)

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‪ ‪ -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? 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. -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?


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.

E) A) and D)
F) A) and C)

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‪ ‪ -If the diagram shown in Figure 9- 6 represents a three- bit Gray code counter, what binary value would exist at 'X'? A) 110 B) 101 C) 011 D) 010 -If the diagram shown in Figure 9- 6 represents a three- bit Gray code counter, what binary value would exist at 'X'?


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

E) A) and B)
F) A) and C)

Correct Answer

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‪ ‪ -The circuit in Figure 9- 11 is used for _________ and for the inputs shown, the DATA OUT will be _________ . A) parallel- to- serial conversion, HIGH B) demultiplexing, 0 C) multiplexing, 1 D) parallel- to- serial conversion, 0 -The circuit in Figure 9- 11 is used for _________ and for the inputs shown, the DATA OUT will be _________ .


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

E) C) and D)
F) B) and D)

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

A) True
B) False

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‪ ‪ -The counter shown in Figure 9- 1 is a(n) __________ counter, and the correct output waveform for Q<sub>1</sub> is__________ . A) synchronous, Q1a B) asynchronous, Q1b C) asynchronous, Q1c D) synchronous, Q1d -The counter shown in Figure 9- 1 is a(n) __________ counter, and the correct output waveform for Q1 is__________ .


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

E) A) and D)
F) B) and D)

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‪ ‪ -Which of the waveforms shown in Figure 9- 2 represents the output of FF2? A) Waveform a B) Waveform b C) Waveform c D) Waveform d -Which of the waveforms shown in Figure 9- 2 represents the output of FF2?


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

E) B) and C)
F) C) and D)

Correct Answer

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


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.

E) A) and C)
F) A) and D)

Correct Answer

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