Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 8th Sem New 2181910 Renewable Energy Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2181910 Date: 26/11/2018
Subject Name: Renewable Energy Engineering
Time: 02:30 PM TO 05:00 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) Write needs of renewable energy. 03
(b) Explain criteria for site selection of wind energy conversion system. 04
(c) Describe solar constant and derive its equation. 07
Q.2 (a) List factors affecting production of biogas. 03
(b) Compare solar flat plate and concentratic collectors. 04
(c) Prove that in case of Horizontal Axis Wind Turbine maximum
power can develop when exit velocity = 1/3 of wind velocity and
Pmax = 8 * (?AVi
3
/ 27)
07
OR
(c) Calculate monthly average of Daily Total Solar Radiation on a
Horizontal Surface located in Ahmedabad Gujarat state (22
o
.13? N,
73
o
.10? E) for the month of March. Average Solar day hours are 10.1
hrs. Angstrom?s constants for Ahmedabad, a = 0.28, b = 0.48
07
Q.3 (a) Explain Declination angle in detail. 03
(b) Explain working of solar cooker. 04
(c) List instruments used for measurement of solar radiation intensity.
Explain any one with neat sketch.
07
OR
Q.3 (a) What are functions of yaw control and pitch control mechanisms in
wind turbine?
03
(b) Explain the different heat losses in Flat plate Collector. 04
(c) List components of wind energy conversion system, show them with
neat sketch. Compare horizontal axis wind turbine with vertical axis
wind turbine.
07
Q.4 (a) Explain principle of MHD generation. 03
(b) Draw neat sketches of Open and Closed cycle OTEC systems. 04
(c) Explain Construction & working of Floating drum type biogas plant
with neat sketch.
07
OR
Q.4 (a) Explain principle of OTEC. 03
(b) What are the advantages and applications of geothermal energy. 04
(c) Explain with sketchs the various methods of tidal power generation.
What are the limitations of each method?
07
Q.5 (a) Define: Net present value, Internal rate of return, Return on
Investment
03
(b) For an 12,00,000/- investment in solar energy equipment which
meets 55% of annual load of 155 GJ. If first year fuel cost is Rs. 750
per GJ and expected to inflate at 10% per year. Calculate (1)
undiscounted payback time (2) discounted payback time if discount
future cost at rate 9%.
04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2181910 Date: 26/11/2018
Subject Name: Renewable Energy Engineering
Time: 02:30 PM TO 05:00 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) Write needs of renewable energy. 03
(b) Explain criteria for site selection of wind energy conversion system. 04
(c) Describe solar constant and derive its equation. 07
Q.2 (a) List factors affecting production of biogas. 03
(b) Compare solar flat plate and concentratic collectors. 04
(c) Prove that in case of Horizontal Axis Wind Turbine maximum
power can develop when exit velocity = 1/3 of wind velocity and
Pmax = 8 * (?AVi
3
/ 27)
07
OR
(c) Calculate monthly average of Daily Total Solar Radiation on a
Horizontal Surface located in Ahmedabad Gujarat state (22
o
.13? N,
73
o
.10? E) for the month of March. Average Solar day hours are 10.1
hrs. Angstrom?s constants for Ahmedabad, a = 0.28, b = 0.48
07
Q.3 (a) Explain Declination angle in detail. 03
(b) Explain working of solar cooker. 04
(c) List instruments used for measurement of solar radiation intensity.
Explain any one with neat sketch.
07
OR
Q.3 (a) What are functions of yaw control and pitch control mechanisms in
wind turbine?
03
(b) Explain the different heat losses in Flat plate Collector. 04
(c) List components of wind energy conversion system, show them with
neat sketch. Compare horizontal axis wind turbine with vertical axis
wind turbine.
07
Q.4 (a) Explain principle of MHD generation. 03
(b) Draw neat sketches of Open and Closed cycle OTEC systems. 04
(c) Explain Construction & working of Floating drum type biogas plant
with neat sketch.
07
OR
Q.4 (a) Explain principle of OTEC. 03
(b) What are the advantages and applications of geothermal energy. 04
(c) Explain with sketchs the various methods of tidal power generation.
What are the limitations of each method?
07
Q.5 (a) Define: Net present value, Internal rate of return, Return on
Investment
03
(b) For an 12,00,000/- investment in solar energy equipment which
meets 55% of annual load of 155 GJ. If first year fuel cost is Rs. 750
per GJ and expected to inflate at 10% per year. Calculate (1)
undiscounted payback time (2) discounted payback time if discount
future cost at rate 9%.
04
2
(c) Explain the working of vapour dominated geothermal system with
neat sketch.
07
OR
Q.5 (a) Explain method of simple payback period. What are its limitations? 03
(b) A 100 liter per day domestic solar water heater saves consumption
of electricity in an electrical geyser on 100 days of the year by
heating 100 liters of water from 15oC to 60oC. The useful life of the
solar water heater is estimated as 10 years. Determine the present
worth of saving through the use of the solar water heater, if the
efficiency of electrical geyser is 90% and the cost of electricity is Rs
4 per kWh. Assume interest rate as 12%.
04
(c) What are solar ponds? Discuss the working of a solar pond with help
of a neat sketch.
07
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This post was last modified on 20 February 2020