Electronics and Communication Engineering - Electronic Devices and Circuits

16. 

High purity copper is obtained by

A. rolling casting
B. casting
C. electrolytic refining
D. induction heating

Answer: Option C

Explanation:

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17. 

Photo electric emission can occur only if the frequency of light is more than threshold frequency.

A. True
B. False

Answer: Option A

Explanation:

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18. 

In a JFET the width of channel is controlled by

A. gate voltage
B. drain current
C. source current
D. all of the above

Answer: Option A

Explanation:

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19. 

The unit of thermal resistance of a semi-conductor device is

A. Ohms
B. Ohms/°C
C. °C/ohm
D. °C/watt

Answer: Option D

Explanation:

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20. 

Figure represents a

A. Varactor
B. LED
C. Zener diode
D. Temperature dependent diode

Answer: Option C

Explanation:

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