Electronics and Experimental Methods-Opto-Electronic Devices (CSIR Physical Sciences): Questions 1 - 4 of 6

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Question number: 1

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

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.

1.5×1016

b.

2.5×1016

c.

0.8×1016

d.

5.0×1016

Question number: 2

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

Appeared in Year: 2014

MCQ▾

Question

The power of density of sunlight incident on a solar cell is 100mWcm2 . Its short circuit current density is 30mAcm2 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.

42.0 to 26.2

d.

21.0 to 10.5

Question number: 3

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

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

In figure the output characteristic of the solar panel at certain level of irradiance.

If the solar cell is to power a load of 5Ω , the power drawn by the load is –

(December)

Choices

Choice (4) Response
a.

45W

b.

50W

c.

73W

d.

97W

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: 4 (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

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