Electronic Devices - PNPN

Exercise :: PNPN - Filling the Blanks

11. 

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: Option D

Explanation:

No answer description available for this question. Let us discuss.

12. 

The current induced by photoelectric effects is the ________ current of the transistor.

A. collector
B. base
C. emitter
D. None of the above

Answer: Option B

Explanation:

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13. 

The switching time of an opto-isolator ________ with increased current, while for many devices it is exactly the reverse.

A. increases
B. decreases
C. remains the same
D. None of the above

Answer: Option B

Explanation:

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14. 

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: Option B

Explanation:

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15. 

An opto-isolator contains ________.

A. an infrared LED
B. a photodetector
C. both an infrared LED and a photodetector
D. None of the above

Answer: Option C

Explanation:

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