26. The invalid range for an input to TTL logic is from ________.
(a) 0 to 0.8 V
(b) 1.2 to 1.6 V
(c) 0.8 to 2.0 V
(d) 2.0 to 5.0 V
27. The horizontal axis of an oscilloscope is normally calibrated in units of ________.
(a) voltage
(b) current
(c) time
(d) frequency
28. The duty cycle of a square wave is ________.
(a) 10%
(b) 25%
(c) 50%
(d) 100%
29. The controls on an oscilloscope that will help obtain a stable display are in the ________.
(a) vertical section
(b) horizontal section
(c) trigger section
(d) display section
30. Digital systems are called ________.
(a) binary systems
(b) logic systems
(c) numbering systems
(d) ADC systems
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