Electronic Devices And Circuits

Exercise: Electronic Devices And Circuits

📂 Electronic Devices And Circuits ✅

Questions for: Electronic Devices And Circuits

At room temperature the barrier potential in a silicon diode is

0.1 V

0.3 V

0.7 V

1 V

Answer: C

This 0.7 V is also called cut in voltage. When forward voltage is 0.7 V or less there is no current.

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Determine the transistor capacitance of a diffused junction varicap diode of a reverse potential of 4.2 V if C(0) = 80 pf and V_T = 0.7 V

42 pf

153.03 pf

13.33 pf

Data inadequate

Answer: A

, Here n = for diffused junction

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When a large number of atoms are brought together to form a crystal

the energy levels of inner shell electrons are affected appreciably by the presence of other neighbouring atoms.

The energy levels of outer shell electrons are affected appreciably by the presence of other neighbouring atoms.

the energy levels of both inner and outer shell electrons are affected appreciably by the presence of other neighbouring atoms.

none of the above.

Answer: B

Inner shell electrons are tightly bound to the nucleus. Their energy levels cannot be affected by presence of other atoms.

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If a sample of germanium and a sample of Si have the impurity density and are kept at room temperature then

both will have equal value of resistivity

both will have equal -ve resistivity

resistivity of germanium will be higher than that of silicon

resistivity of Si will be higher than of germanium

Answer: D

Since the majority of charge carrier is better in Ge than in Si, for the same concentration of charge carriers, the conductivity of Ge is higher than that of Si.

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When a p-n junction is reverse biased

holes and electrons move away from the junction

holes and electrons move towards the junction

holes move towards junction and electrons move away from junction

holes move away from junction and electrons move towards junction

Answer: A

Holes and electrons move away from junction and therefore resistance increases to a high value.

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