Electronics and Communication Engineering - Electronic Devices and Circuits

46. 

Fermi level is the maximum energy that an electron can possess at 0 K.

A. True
B. False

Answer: Option A

Explanation:

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47. 

The voltage across the secondary of the transformer in a half wave rectifier (without any filter circuit) is 25 volts. The maximum voltage on the reverse biased diode will be

A. 100 V
B. 50 V
C. 25 V
D. 12.5 V

Answer: Option C

Explanation:

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48. 

The residual resistivity of a binary alloy at 0°K is

A. the sum of the residual resistivities of the component metals
B. the difference of the residual resistivities of the component metals
C. the product of the residual resistivities of the component metals
D. depend on the concentration of the minor component in the alloy

Answer: Option D

Explanation:

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49. 

Which of the following insulating material is restricted to temperatures below 100°C?

A. Micanite
B. Asbestos
C. Teflon
D. Polythene

Answer: Option D

Explanation:

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50. 

- ve feedback in an amplifier

A. reduces gain
B. increase frequency and phase distortion
C. reduce bandwidth
D. increase noise

Answer: Option A

Explanation:

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