Introduction to Digital Systems – Exercise – 2

61. Digital systems have ________.

(a) one state
(b) two states
(c) three states
(d) four states

62. The frequency of a pulse train is 2 kHz. The pulse period is ________.

(a) 5 ms
(b) 50 ms
(c) 500 s
(d) 2 s

63. The rise time is the time it takes a pulse to go from ________.

(a) the base line to the maximum HIGH voltage
(b) 10% of the pulse amplitude to the maximum HIGH voltage
(c) the base line to 90% of the pulse amplitude
(d) 10% of the pulse amplitude to 90% of the pulse amplitude

64. A pulse has a period of 15 ms. Its frequency is ________.

(a) 6.66 Hz
(b) 66.66 Hz
(c) 666.66 Hz
(d) 15 Hz

65. In positive logic, ________.

(a) a HIGH = 1, a LOW = 0
(b) a LOW = 1, a HIGH = 0
(c) only HIGHs are present
(d) only LOWs are present

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