M.Sc. (Semester III) (CBCS) Examination Nov/Dec-2018
Physics (Applied Electronics)
ENERGY HARVESTING DEVICES
Time: 2½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
All questions carry equal marks.
Q.1 Multiple choice questions. 14
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 and
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 the 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
An oscillator produces ______oscillations.
Damped Undamped
Modulated None of the above
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 E° values are very high.
They are primary batteries. E the concentrations of reag.
Quantum dot-sensitized solar cells are cell.
First generation Second generation
Third generation Fourth generation
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10) Practically the efficiency of QDSSC is lower than DSSC because
Multiple exiton Photoanode
Electrolyte Counter Electrode
11) The Perovskite solar cell is not a QDSSC because involved instead of
Quantum Dots.
Photoanode Methyl ammonium lead iodide
Spiro Ome TAD Counter electrode
12) The theoretically first quantum dot solar cell introduce in year
1985 1990
1995 2000
13) In Fabrication of QDSSC
Series resistance and Shunt resistance are equal
Series resistance and Shunt resistance are zero
Series resistance is higher and Shunt resistance is lower
Series resistance is lower and Shunt resistance is higher
14) Main drawback of DSSC is
Use of liquid electrolyte Degradation of dye
Difficultly in sealing of the panel All of these
Q.2 Attempt the following. (Any Four) 08
A Si sample is doped with 1x 1016 P atoms/cm3. What will be the minority
hole carrier concentration at room temperature?
Briefly describe Solar Cell Characteristics.
Calculate the efficiency and peak power of a Si solar cell operating at
270C with short circuit current of 2.2A and operating under standard
illumination of 1000 W/m2. The area of solar cell is about 100 cm2.
Explain what is Surface Passivation.
What is TCO? What are the material requirements of a TCO layer?
Write note on. (Any Two) 06
Briefly explain the effect of Temperature on Efficiency of Solar Cells.
What is Fill Factor and what is its role in Designing of Solar Cell?
What is Energy Band Diagram? Draw the Solar Cell Structure of Si: H
based Solar Cells.
Q.3 Answer the following. (Any Two) 08
Explain p-n junction solar cell with example.
Explain the different types of supercapacitor.
Explain principle and working of ion exchange membrane in fuel cells.
Answer the following. (Any One) 06
How much electric energy will an ideal fuel cell (using methanol and air)
produce per kg of fuel?
Explain CdS/Cu2S based solar cells.
Q.4 Answer the following. (Any Two) 10
Explain fabrication of supercapacitor with example.
What is the theoretical efficiency of photodiodes made of semiconductor
with band gap energy of 1.4 eV when exposed to sunlight?
Under different illumination, the cell (10cm 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
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Answer the following. (Any One) 04
Design a Solar Cell for High FF.
Mention the Analytical Techniques for various parameter measurements
in Solar Cell? Explain the I-V Measurement using a neat diagram.
Q.5 Answer the following. (Any Two) 14
Principal construction and working of electrochemical double layer capacitor.
Discuss basic concept, working and materials for DSSC solar cells.
Explain the concept of energy storage and write difference between batteries,
supercapacitors and capacitors with suitable figures.