Electronics and Communication Engineering - Electronic Devices and Circuits

1. 

Lowest resistivity of the following is

A. constantan
B. german silver
C. manganin
D. nichrome

Answer: Option B

Explanation:

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2. 

Peak inverse voltage will be highest for

A. half wave rectifier
B. full wave rectifier
C. bridge rectifier
D. three phase full wave rectifier

Answer: Option B

Explanation:

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3. 

In CE configuration, the output characteristics of a bipolar junction transistor is drawn between

A. IC and VCB
B. IE and VCB
C. IC and VCE
D. IE and VCE

Answer: Option C

Explanation:

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4. 

Assertion (A): The reverse current in a p-n junction is nearly constant.

Reason (R): The reverse breakdown voltage of a p-n diode depends on the extent of doping.

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 B

Explanation:

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5. 

An n type semiconductor is illuminated by a steady flux of photons with energy greater than the band gap energy. The change in conductivity Δσ obeys which relation?
[ Here, e is the electron charge, μn electron mobility, μp hole mobility, Δnp) is the excess electron (hole) density ].

A. Δσ = 0
B. Δσ = en + σp) Δn
C. Δσ = enΔn - μpΔp)
D. Δσ = e μnΔn

Answer: Option B

Explanation:

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