Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 8th Sem New 2181910 Renewable Energy Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2181910 Date:15/05/2019
Subject Name:Renewable Energy Engineering
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Explain brief present scenario of conventional and renewable energy
sources worldwide.
03
(b) Explain the following terms with neat sketches: Air Mass, solar
azimuth, Hour angle, solar altitude.
04
(c) A horizontal shaft, propeller type wind turbine is located in area
having following wind characteristics: speed of wind 10m/s at 1 atm
and 15?C, Calculate the following:
1. Air density
2. Total power density in wind stream
3. Maximum and actual possible obtainable power density
4. Total power from wind turbine of 120m diameter
5. Torque and axial thrust on wind turbine operating at 40 rpm
and at maximum efficiency of 42%.
07
Q.2 (a) Explain advances in solar cell modules and arrays used for
electricity generation.
03
(b) Explain methods of improving thermal performance of box type
solar cookers.
04
(c) Calculate monthly average global solar radiation on a horizontal
surface located in Ahmedabad, Gujarat state 22? 00?N, 73?10?E for
the month of April. Average solar day hours are 10 hrs, Andstrom?s
constant for Ahmedabad: a=0.28, b=0.48
07
OR
(c) Calculate useful heat gain, exit fluid temperature and collection
efficiency for a cylindrical parabolic concentrator system of 2 m
width and 8m length. The absorbing cylinder has a diameter of 6 cm
and transparent cover has diameter of 9cm optical properties as
estimated as ?=0.85, (?, ?) =0.77, ?=0.94, heat transfer coefficient
from fluid inside to surrounding Uo=6.04W/m
2
?C, heat transfer
coefficient from absorber cover surface to surrounding U L=6.98
W/m
2
?C, the incident beam radiation on the aperture of the collector
is 698 W/m
2
and ambient temperature is 25?C. The incident beam
radiation on the aperture of the collector is 698W/m
2
and the
ambient temperature is 25?C. The collector is designed to heat fluid
entering absorber at 150?C at a flow rate of 400 kg/ hr. The fluid has
Cp=1.25kJ/ Kg?C.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2181910 Date:15/05/2019
Subject Name:Renewable Energy Engineering
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Explain brief present scenario of conventional and renewable energy
sources worldwide.
03
(b) Explain the following terms with neat sketches: Air Mass, solar
azimuth, Hour angle, solar altitude.
04
(c) A horizontal shaft, propeller type wind turbine is located in area
having following wind characteristics: speed of wind 10m/s at 1 atm
and 15?C, Calculate the following:
1. Air density
2. Total power density in wind stream
3. Maximum and actual possible obtainable power density
4. Total power from wind turbine of 120m diameter
5. Torque and axial thrust on wind turbine operating at 40 rpm
and at maximum efficiency of 42%.
07
Q.2 (a) Explain advances in solar cell modules and arrays used for
electricity generation.
03
(b) Explain methods of improving thermal performance of box type
solar cookers.
04
(c) Calculate monthly average global solar radiation on a horizontal
surface located in Ahmedabad, Gujarat state 22? 00?N, 73?10?E for
the month of April. Average solar day hours are 10 hrs, Andstrom?s
constant for Ahmedabad: a=0.28, b=0.48
07
OR
(c) Calculate useful heat gain, exit fluid temperature and collection
efficiency for a cylindrical parabolic concentrator system of 2 m
width and 8m length. The absorbing cylinder has a diameter of 6 cm
and transparent cover has diameter of 9cm optical properties as
estimated as ?=0.85, (?, ?) =0.77, ?=0.94, heat transfer coefficient
from fluid inside to surrounding Uo=6.04W/m
2
?C, heat transfer
coefficient from absorber cover surface to surrounding U L=6.98
W/m
2
?C, the incident beam radiation on the aperture of the collector
is 698 W/m
2
and ambient temperature is 25?C. The incident beam
radiation on the aperture of the collector is 698W/m
2
and the
ambient temperature is 25?C. The collector is designed to heat fluid
entering absorber at 150?C at a flow rate of 400 kg/ hr. The fluid has
Cp=1.25kJ/ Kg?C.
07
2
Q.3 (a) With neat sketch explain solar heating system using water heating
solar collectors. What are advantages and disadvantages of this
system?
03
(b) Describe different schemes of electric generation and explain
generator control mechanism.
04
(c) Derive an equation for maximum power, maximum torque, and
maximum axial thrust available from wind turbine. What is
optimum velocity?
07
OR
Q.3 (a) Explain site selection criteria of Wind farms. 03
(b) Write brief note on characteristic curves of wind machines. 04
(c) List advantages and disadvantages of geothermal energy compared
to other energy forms.
07
Q.4 (a) With neat sketch explain wave energy conversion by floats and its
requirements for high energy conversion.
03
(b) What is a community bio gas plant? What are the main problems
encountered in its operation?
04
(c) With neat sketch explain closed cycle MHD system. Explain the
significance of seeded inert gas in MHD generator.
07
OR
Q.4 (a) Explain principle of ocean thermal energy conversion and its
limitations.
03
(b) What is meant by energy plantation? What are its advantages and
disadvantages?
04
(c) Explain in brief geothermal energy scenario in India and worldwide.
List various research organizations working on geothermal energy.
07
Q.5 (a) Define following terms: Payback period, Inflation, benefit cost ratio. 03
(b) With example explain why a project with a high IRR is not
necessarily more attractive than a project with lower IRR?
04
(c) Write brief note on clean development mechanisms. 07
OR
Q.5 (a) Define following terms: Annual cost, present worth value, life cycle
cost.
03
(b) Explain site selection criteria of tidal power plants. 04
(c) With usual notations derive an expression for cumulative savings. 07
*************
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This post was last modified on 20 February 2020