Electronics and Experimental Methods-Opto-Electronic Devices (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 1 - 5 of 7

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Question number: 1

» Electronics and Experimental Methods » Opto-Electronic Devices » LEDs

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Appeared in Year: 2012

MCQ▾

Question

An LED operates at 1.5 V and 5 mA in forward bias. Assuming an 80 % external efficiency of the LED, how many photons are emitted per second? (June)

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 2

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

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Appeared in Year: 2014

MCQ▾

Question

The power of density of sunlight incident on a solar cell is . Its short circuit current density is and the open circuit voltage is 0.7 V. If the fill factor of the solar cell decreases from 0.8 to 0.5, then the percentage efficiency will decrease from (December)

Choices

Choice (4)Response

a.

16.8 to 10.5

b.

24.0 to 16.8

c.

21.0 to 10.5

d.

42.0 to 26.2

Question number: 3

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

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Appeared in Year: 2012

MCQ▾

Question

The output characteristic of a solar panel at a certain level of irradiance is shown in the figure below.

The output characteristic of solar panel

The Output Characteristic of Solar Panel

If the solar cell is to power a load of , the power drawn by the load is –

(December)

Choices

Choice (4)Response

a.

b.

c.

d.

Passage

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

Question number: 4 (1 of 2 Based on Passage) Show Passage

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

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MCQ▾

Question

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

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 5 (2 of 2 Based on Passage) Show Passage

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

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MCQ▾

Question

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

Choices

Choice (4)Response

a.

b.

c.

d.

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