electronic-devices-pnpn Related Question Answers
27. How many layers of semiconductor materials does a silicon-controlled rectifier (SCR) have?
28. The peak and valley currents of the PUT are typically ________ those of a similarly rated UJT.
29. The ________ the anode gate current, the ________ the required anode-to-cathode voltage to turn the SCS device on.
30. SCRs have been designed to control powers as high as ________, with individual ratings as high as ________ at ________.
31. The two-layer semiconductor diode has led to ________layer devices.
32. The minimum operating voltage of the UJT is typically ________ that of a similarly rated PUT.
33. In general, the triggering (turn-on) anode gate current is ________ the required cathode gate current.
34. The four-layer devices with a control mechanism are commonly referred to as ________.
35. ________ is(are) example(s) of applications of phototransistors.
36. ________ in light intensity corresponds with ________ in collector current.
38. At –65ºC the minimum current that will trigger the series of an SCR is ________, while at +150ºC only ________ is required.
39. The current induced by photoelectric effects is the ________ current of the transistor.
40. The switching time of an opto-isolator ________ with increased current, while for many devices it is exactly the reverse.
41. The ________ are the terminals of SCRs.
42. An opto-isolator contains ________.
43. The method(s) for turning off an SCR is (are) categorized as ________.
44. In a programmable unijunction transistor (PUT), the ________ can be controlled through a couple of resistors and the supply voltage.
45. The ________ are the terminals of an SCS.
46. The SCRs have typical turn-on times of ________ in the regeneration action.
47. In the conduction region, the dynamic resistance of the SCR is typically ________ to ________.
48. The anode gate connection can be used to turn the SCS device ________.
49. ________ is (are) the element(s) of a unijunction transistor's equivalent circuit.
50. 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.
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