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

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 401 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 300.00 or

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.

Equation

b.

Equation

c.

Equation

d.

Equation

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 Equation . Its short circuit current density is Equation 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 Equation , the power drawn by the load is –

(December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Passage

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

Question number: 4 (1 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 Equation and if Equation power is lost on reflection at the surface, the power absorbed will be –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

f Page
Sign In