PNPN Devices – Exercise – 1

46. At –65ºC the minimum current that will trigger the series of an SCR is ________, while at +150ºC only ________ is required.

(a) 20 mA, 100 mA
(b) 50 mA, 75 mA
(c) 75 mA, 50 mA
(d) 100 mA, 20 mA

Answer
Answer : (d)
Explanation
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47. The ________ are the terminals of SCRs.

(a) anode and cathode
(b) anode, gate, and cathode
(c) base, anode, and cathode
(d) gate and anode

Answer
Answer : (b)
Explanation
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48. ________ is (are) the element(s) of a unijunction transistor’s equivalent circuit.

(a) One fixed resistor
(b) A variable resistor
(c) A diode
(d) All of the above

Answer
Answer : (d)
Explanation
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49. The current induced by photoelectric effects is the ________ current of the transistor.

(a) collector
(b) base
(c) emitter
(d) None of the above

Answer
Answer : (b)
Explanation
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50. ________ in light intensity corresponds with ________ in collector current.

(a) An increase, an increase
(b) An increase, a decrease
(c) A decrease, an increase
(d) None of the above

Answer
Answer : (a)
Explanation
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