Digital Electronics - Counters

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Exercise

General Questions
True or False
Filling the Blanks

"Hold a true friend with both hands."

- (Proverb)

67.

Referring to Figure 7-6, what action takes place during the interval labeled "Y"?

A.	Parallel data transfer takes place.
B.	Parallel data is shifted through the register.
C.	Serial data is shifted through the register.
D.	Clock pulses are toggled through the register.

68.

Which of the following statements are true?

A.	Asynchronous events do not occur at the same time.
B.	Asynchronous events are controlled by a clock.
C.	Synchronous events do not need a clock to control them.
D.	Only asynchronous events need a control clock.

69.

Referring to Figure 7-7, what action takes place at point "W" on the timing diagram?

A.	Data is loaded into the register from the parallel inputs.
B.	The parallel inputs are inhibited, that is, prevented from loading into the register.
C.	The serial inputs are loaded into the register.
D.	The outputs are cleared; set to LOW.

70.

Which segments (by letter) of a seven-segment display need to be active in order to display a digit 6?

A.	b, c, d, e, and g
B.	c, d, e, f, and g
C.	a, b, c, d, and f
D.	b, c, d, e, and f

71.

Which of the following groups of logic devices would be the minimum required for a MOD-64 synchronous counter?

A.	Five flip-flops, three AND gates
B.	Seven flip-flops, five AND gates
C.	Four flip-flops, ten AND gates
D.	Six flip-flops, four AND gates

72.

The circuit given below fails to produce data output. The individual flip-flops are checked with a logic probe and pulser, and each checks OK. What could be causing the problem?

A.	The data output line may be grounded.
B.	One of the clock input lines may be open.
C.	One of the interconnect lines between two stages may have a solder bridge to ground.
D.	One of the flip-flops may have a solder bridge between its input and V_cc.