PNPN Devices » Exercise – 2
51. ________ is(are) example(s) of applications of phototransistors.
(a) Punch-card readers
(b) Lighting control (for example, on highways)
(c) Level indication
(d) All of the above
52. To turn on an SCS device, a ________ pulse must be applied to the anode gate terminal; to turn off the device, a ________ pulse is required.
(a) positive, positive
(b) negative, positive
(c) positive, negative
(d) negative, negative
53. In general, the triggering (turn-on) anode gate current is ________ the required cathode gate current.
(a) larger than
(b) the same as
(c) smaller than
(d) None of the above
54. A(n) ________ can be triggered in either direction.
(a) SCR
(b) Shockley diode
(c) diac
(d) SCS
55. An opto-isolator contains ________.
(a) an infrared LED
(b) a photodetector
(c) both an infrared LED and a photodetector
(d) None of the above
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