Electronics and Experimental Methods (CSIR Physical Sciences): Questions 37 - 40 of 41

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Passage

Light of wavelength 660 nm and power of 1mW is incident on a semiconductor photodiode with an absorbing layer of thickness of ln4μm .

Question number: 37 (1 of 2 Based on Passage) Show Passage

» Electronics and Experimental Methods » Opto-Electronic Devices » Photo-Detectors

MCQ▾

Question

The generated photo – current for a quantum efficiency of unity will be –

Choices

Choice (4) Response
a.

360μA

b.

400μA

c.

120μA

d.

133μA

Question number: 38 (2 of 2 Based on Passage) Show Passage

» Electronics and Experimental Methods » Opto-Electronic Devices » Photo-Detectors

MCQ▾

Question

If the absorption coefficient at this wavelength is 104cm1 and if 1% power is lost on reflection at the surface, the power absorbed will be –

Choices

Choice (4) Response
a.

250μW

b.

225μW

c.

750μW

d.

675μW

Question number: 39

» Electronics and Experimental Methods » Opto-Electronic Devices » Solar Cells

Appeared in Year: 2011

MCQ▾

Question

Monochromatic light of wavelength 660nm and intensity 100mWcm2 falls on a solar cell of area 30cm2 . The conversion efficiency of the solar cell is 10%. If each converted photon results in an electron – hole pair, what is the maximum circuit current supplied by the solar cell?

(Take h=6.6×1034Js , c=3×108ms and e=1.6×1019C ) (December)

Choices

Choice (4) Response
a.

320mA

b.

3200mA

c.

1600mA

d.

160mA

Question number: 40

» Electronics and Experimental Methods » Operational Amplifiers

Appeared in Year: 2011

MCQ▾

Question

A time varying signal Vin is fed to an Op – Amp circuit with output signal V0 as shown

A circuit diagram of an Op – amp

A Circuit Diagram of an Op – Amp

In figure a circuit diagram of an Op – amp is shown.

The circuit implements a (June)

Choices

Choice (4) Response
a.

Low pass filter with cutoff frequency 16 Hz

b.

Low pass filter with cutoff frequency 100 Hz

c.

High pass filter with cutoff frequency 16 Hz

d.

High pass filter with cutoff frequency 100 Hz

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