46. An input at a frequency of 1070 Hz will drive the decoder output voltage to ________.
(a) –5 V
(b) 14 V
(c) –5 V and 14 V
(d) None of the above
47. For the RS-232C circuit, ________ is a mark and ________ is a space.
(a) 12 V, –12 V
(b) –12 V, 12 V
(c) 5 V, 0 V
(d) –5 V, 0 V
48. For transistor transistor logic (TTL) circuits, ________ is a mark and ________ is a space.
(a) 12 V, 0 V
(b) 0 V, 12 V
(c) 0 V, 5 V
(d) 5 V, 0 V
49. Which of the following require(s) interfacing circuitry?
(a) Keyboards
(b) Video terminals
(c) Printers
(d) All of the above
50. In a ladder-network conversion, the ________ circuit provides a signal to stop the counter when the staircase voltage rises above the input voltage.
(a) control logic
(b) comparator
(c) ladder-network
(d) None of the above
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