M.Sc. (Semester III) (CBCS) Examination Oct/Nov-2017
Physics (Applied Electronics)
ENERGY HARVESTING DEVICE
Day Date: Saturday, 25-11-2017 Max. Marks: 70
Time: 02.30 PM to 05.00 PM
Instructions: Q.1 and Q.2 are compulsory.
Attempt any three questions from Q. 3 to 7.
Figures to the right indicate full marks.
Q.1 Select the correct alternative: 08
Which of the following capacitors has the highest capacitance-voltage
value?
Ceramic capacitor
Parallel plate capacitor
Electrolytic capacitor
Electrochemical supercapacitors
What is a dielectric material?
It is an electrical insulator that can be polarized by an applied
electric field
It is an electrical conductor that can be polarized by an applied
electric field
Both a and b
None of these
The most important source of heat on earth is
Friction connected with the rotation of the Earth
Solar radiation
Chemical reactions in animals and plants
Energy produced by human industry
How do solar panels work?
The energy produced by the sun is stored in a generator.
Silicon is used to convert sunlight directly into energy.
The solar collectors store the energy which is instantaneously
delivered to houses
All above
A fuel cell is used to convert chemical energy into
Mechanical energy Solar energy
Electrical energy Potential energy
Voc is maximum when
Both terminals of cell is closed
Both terminal of cell is open
Low shunt resistance
None of these
Dye Sensitized Solar cell is solar cell.
First Generation Second Generation
Third Generation Fourth Generation
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SLR-E-3
Why do mercury batteries and silver batteries maintain a constant
voltage?
They never run down.
No aqueous species appear in the equation for the overall cell
reaction.
Their Eo values are very high.
They are primary batteries.
Q.1 Fill in the blanks state true or false:- 06
TiO2 is most preferable metal Oxide in Dye Sensitized Solar Cell.
Electrolyte is photo-electrochemical cell not the redox mediator.
Poly-iodide is one of the most preferable electrolytes for liquid solar
cell.
Shockley queasier limit is define for Quantum Efficiency.
Practically the efficiency of QDSSC is lower than DSSC because
Multiple exiton.
CdS/Cu2S based solar cells are a fourth generation solar cell.
Q.2 Attempt the following:- 14
Principal construction and working of electrochemical double layer
capacitor.
08
Explain CdS/Cu2S based solar cells. 06
Q.3 Discuss basic concept, working and materials for DSSC solar cells. 08
How much electric energy will an ideal fuel cell (using methanol and air)
produce per kg of fuel?
06
Q.4 Explain the concept of energy storage and write difference between
batteries, supercapacitors and capacitors with suitable figures.
08
Under different illumination, the cell(10 cm X 10 cm with 100% quantum
efficiency) delivers 5 A into a short circuit. The reverse saturation current is
100 pA. Disregard any internal resistance of the photodiode. What is the
open-circuit voltage at 300
06
Q.5 Explain magnetoelectric composites and microcantilever. 08
What is the theoretical efficiency of photodiodes made of semiconductor
with band gap energy of 1.4 eV when exposed to sunlight?
06
Q.6 Explain piezoelectric power generators with power storage circuit. 08
Explain principle and working of proton exchange membrane in fuel cells. 06
Q.7 Explain organic solar cells: basic concept, working, fabrication etc. 08
Explain fabrication of supercapacitor with example. 06