Electronics and Communication Engineering - Electronic Devices and Circuits

41. 

The current due to thermionic emission is given by Richardson Dushman equation.

A. True
B. False

Answer: Option A

Explanation:

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42. 

The thermionic emission current is given by

A. Fermi-Dirac distribution
B. Maxwell's equation
C. Richardson Dushman equation
D. Langmuir Child law

Answer: Option C

Explanation:

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43. 

In forward active region, the operation of a BJT

A. both junctions are forward biased
B. both junctions are reverse biased
C. emitter base junction is forward biased and base collector junction is reverse biased
D. emitter base junction is reverse biased and base collector junction is reverse biased

Answer: Option C

Explanation:

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44. 

The conductivity of a semiconductor crystal due to any current carrier is not proportional to

A. mobility of the carrier
B. effective density of states in the conduction band
C. electronic charge
D. surface states in the semiconductor

Answer: Option A

Explanation:

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45. 

A P-N junction diode dynamic conductance is directly proportional to

A. the applied voltage
B. the temperature
C. its current
D. thermal voltage

Answer: Option C

Explanation:

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