Electronics and Communication Engineering - Electronic Devices and Circuits

46. 

Fermi level in intrinsic semiconductor is at the centre of forbidden energy band.

A. True
B. False

Answer: Option A

Explanation:

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47. 

In a photo transistor the photocurrent is

A. emitter base junction
B. collector base junction
C. collector
D. either (a) or (b)

Answer: Option B

Explanation:

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48. 

In photoelectric emission the maximum kinetic energy of emitted electron is proportional to

A. f
B. f
C. f2
D. f3

Answer: Option B

Explanation:

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49. 

In a P-type semiconductor, the conductivity due to holes (= σP) is equal to e = charge of hole, μP = hole mobility, P = hole concentration,

A.
B.
C. P.eP
D.

Answer: Option C

Explanation:

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50. 

Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resulting electric field inside the speciment will be in

A. direction normal to both current and magnetic field
B. the direction of current
C. direction antiparallel to magnetic field
D. an arbitrary direction depend upon conductivity

Answer: Option A

Explanation:

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