Electronics and Communication Engineering - Electronic Devices and Circuits

11. 

What is the function of silicon dioxide layer in MOSFETS?

A. To provide high input resistance
B. To increase current carriers
C. To provide high output resistance
D. Both (a) and (c)

Answer: Option A

Explanation:

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12. 

The modulation of effective base width by collector voltage is known as Early effect, hence reverse collector voltage

A. increases both a and β
B. decrease both a and β
C. increase a but decrease β
D. decrease a but increase β

Answer: Option C

Explanation:

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13. 

Assertion (A): In intrinsic semiconductors, the charge concentration increases with temperature.

Reason (R): At higher temperatures, the forbidden energy gap in semiconductors is lower.

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option A

Explanation:

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14. 

Covalent bond energy in Germanium is approximately

A. 3.8 eV
B. 4.7 eV
C. 7.4 eV
D. 12.5 eV

Answer: Option C

Explanation:

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15. 

Which is correct for a vacuum triode?

A. μ = rpgm
B. rp = μgm
C. gm = μrp
D. rpgm

Answer: Option B

Explanation:

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