Enrolment No.

/Seat No_____________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER–VI (NEW) EXAMINATION – SUMMER 2024
Subject Code:3160917 Date:22-05-2024
Subject Name:Wind And Solar Energy
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.
4. Simple and non-programmable scientific calculators are allowed.

MARKS

Q.1 (a) Define Tip speed ratio, stall and pitch control for wind turbine 03
(b) Mention Power electronics converter role in wind power 04
(c) Write Short note on modern wind turbine technologies 07

Q.2 (a) List the Advantages of Permanent Magnet Synchronous Generators 03

(PMSG) use for wind power
(b) Explain Betz Law with Betz limit value for wind turbine 04
(c) Define various solar angles and their effects on the collection of solar 07
radiation on a titled flat surface
OR
(c) Describe about solar radiation data. 07

Q.3 (a) Define following terms in case of solar energy: 03

i) Altitude angle ii) Zenith angle iii) Clearness Index
(b) Explain measurements of solar radiation 04
(c) Explain working of Doubly-Fed Induction Generators with its 07
characteristics
OR
Q.3 (a) Classify Fixed and Variable speed wind turbines 03
(b) Draw and explain V-I characteristics of a PV cell. 04
(c) Give Comparison of monocrystalline, polycrystalline and thin film type 07
solar module.

Q.4 (a) What is voltage and frequency operating limits on integration of solar 03
and wind system
(b) Write applications of Solar PV Power 04
(c) Write Short Note on solar Street Light 07
OR
Q.4 (a) What is Standalone solar system? Where it can be installed? 03
(b) What are the Power quality issues occurring during integration of solar 04
–wind with grid.
(c) Explain working of Solar thermal power generation plant 07

Q.5 (a) Give the types of solar collector 03

(b) Explain limitation of solar energy 04
(c) Write technical note on Solar Air Conditioning 07

1
 OR
Q.5 (a) What is Maximum Power Point Tracking (MPPT)? 03
(b) Describe Solar water heating plant shortly 04
(c) Explain PV and wind farm behavior during grid disturbances 07

*************

2
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER–VI (NEW) EXAMINATION – WINTER 2023
Subject Code:3160917 Date:11-12-2023
Subject Name:Wind And Solar Energy
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.
4. Simple and non-programmable scientific calculators are allowed.
Marks
Q.1 (a) Define : Tip Speed Ratio (TSR) 03
(b) How solar water pump works? 04
(c) What is Betz limit? Also explain significance of Betz limit. 07

Q.2 (a) What is grid code and why it is required? 03

(b) Explain stall and pitch control of wind turbines. 04
(c) Write short notes on types of generators used in Wind Turbines. 07
OR
(c) Explain V-I characteristics of a solar cell. 07

Q.3 (a) Write short note on DFIG type of Wind Generator. 03

(b) Explain Converter control techniques in case of Wind power 04
(c) Write short notes on solar water pumps. 07
OR
Q.3 (a) What is solar pond? 03
(b) Write short notes on Solar water heater. 04
(c) Explain working of standalone solar PV system. 07

Q.4 (a) What are the types of power converters used in wind generator system ? 03
(b) List out application of solar –thermal systems 04
(c) Explain construction and working of solar cooker. 07
OR
Q.4 (a) Explain fixed –speed wind turbines with neat sketch. 03
(b) Differentiate Grid-Connected System and Standalone system 04
(c) Explain various types of solar collectors in details. 07

Q.5 (a) Define : (i) Solar Azimuth Angle, (ii) Zenith Angle, (iii) Hour Angle 03
(b) Explain solar passive heating and cooling system. 04
(c) Explain solar Refrigeration and Air conditioning System. 07

Q.5 (a) What is Solar Day Length? 03

(b) Write short note on Solar thermal power generation Technologies. 04
(c) What do you mean by solar cell, module, panel and array? 07
*************
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER–VI (NEW) EXAMINATION – SUMMER 2023
Subject Code:3160917 Date:12-07-2023
Subject Name:Wind And Solar Energy
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.
4. Simple and non-programmable scientific calculators are allowed.

MARKS
Q.1 (a) Define Cut in speed, Cut out speed and Tip speed ratio. 03
(b) Write Betz Law and mention Betz limit value for wind turbine. 04
(c) Wind
Derive an expression for power generation in wind turbine. 07
gggggturbine.
Q.2 (a) List the types of generator used in wind power plant. 03
(b) Draw and explain I-V characteristic of a PV array. 04
(c) Explain the power conversion in PV cell with circuit diagram. 07
OR
(c) Explain construction and working of Doubly-Fed Induction 07
Generators with characteristics.

Q.3 (a) Define zenith, solar altitude and azimuth angle in solar geometry. 03
(b) Draw and explain variable speed wind energy conversion system. 04
(c) Explain structure of solar cell, module, panel and array. 07
OR
Q.3 (a) Compare polycrystalline and thin film type solar module. 03
(b) Explain the solar energy availability in India throughout the year. 04
(c) What is Maximum Power Point Tracking (MPPT) system and which 07
types of algorithms used to track maximum power from solar PV System.

Q.4 (a) Differentiate Grid-Connected System and Standalone system. 03

(b) List out Power quality issues during integration of solar wind with grid. 04
(c) Write technical note on Solar Refrigeration and Air Conditioning. 07
OR
Q.4 (a) How solar water pump works? 03
(b) Draw and explain solar street light operation with its circuit diagram 04
(c) Explain power electronics converter used in PV power system 07
for maximum power extraction.

Q.5 (a) What is solar collector? Explain its uses. 03

(b) Give the type of Solar Concentrators used in solar thermal plant. 04
(c) Explain operation of solar pond with its applications. 07
OR
Q.5 (a) Explain operation of solar cooker with usual diagram. 03
(b) What is grid code and why it is required? 04
(c) List out application of solar –thermal systems. 07

*************

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER–VI(NEW) EXAMINATION – WINTER 2022
Subject Code:3160917 Date:16-12-2022
Subject Name:Wind And Solar Energy
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.
4. Simple and non-programmable scientific calculators are allowed.
MARKS
Q.1 (a) Classify the solar radiation and define each term. 03
(b) Write Betz Law and mention betz limit value in case of wind turbine. 04
(c) List out various solar thermal applications & explain any one in detail. 07

Q.2 (a) Explain solar cell, module and array. 03

(b) Explain stall control & pitch control of wind power. 04
(c) Explain fixed speed wind turbine with neat sketch. Also mention its 07
advantages & disadvantages.
OR
(c) Explain construction and working of Doubly-Fed Induction Generators. 07

Q.3 (a) Explain Wind Physics in detail. 03

(b) Define the following. 1) Azimuth angle 2) Latitude angle 3) longitude 04
angle 4) Zenith angle
(c) Explain the importance & working of solar water pump. 07
OR
Q.3 (a) Classify the generators used in wind power plant. 03
(b) Explain the operation of grid connected solar PV system. 04
(c) Explain the modeling of elements in hybrid PV-wind system briefly. 07

Q.4 (a) Write the short note on battery sizing. 03

(b) List the advantage and limitation of Solar Energy. 04
(c) What is Maximum Power Point Tracking (MPPT) system? Explain P & 07
O algorithm to track maximum power from solar PV System.
OR
Q.4 (a) What are the grid code technical requirements? 03
(b) Describe various types of power quality issues. 04
(c) Explain solar passive heating & cooling system. 07

Q.5 (a) Define : Cut in speed, Cut out speed & Tip speed ratio 03
(b) Explain the concept of central receiver. 04
(c) Classify the solar thermal collectors. Explain the construction & 07
working of solar flat plate collector.
OR
Q.5 (a) Define air mass & explain it. 03
(b) Write short note on box type solar cooker. 04
(c) Draw & explain the I-V and P-V characteristics of Solar cell. 07

*************

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER–VI (NEW) EXAMINATION – SUMMER 2022
Subject Code:3160917 Date:08/06/2022
Subject Name:Wind And Solar Energy
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.
4. Simple and non-programmable scientific calculators are allowed.
Marks
Q.1 (a) Explain the available wind power scenario in India. 03
(b) Explain stall and pitch control for wind power conversion system. 04
(c) What is maximum power point tracking algorithm for PV system? Explain 07
any one in details

Q.2 (a) Draw the Torque – Speed characteristic of induction generator. 03

(b) Draw and explain I-V characteristic of a PV array. 04
(c) Derive an expression for power generation in wind turbine. 07
OR
(c) Explain the power conversion in PV cell with circuit diagram. 07

Q.3 (a) Draw the per phase model of PMSG. Also write its terminal per phase 03
voltage expression.
(b) Draw and explain variable speed wind energy conversion system. 04
(c) Explain the electrical circuit model of PV cell. 07
OR
Q.3 (a) Define earth sun angle and observer sun angle. 03
(b) Explain the solar energy availability in India throughout the year. 04
(c) Explain power electronics converter used for doubly-fed induction 07
generator with circuit diagram

Q.4 (a) What are PV module and PV Array? 03

(b) Draw and explain solar street light operation with its circuit diagram 04
(c) Explain power electronics converter used in PV power system for 07
maximum power extraction.
OR
Q.4 (a) Explain necessity of battery in PV based power system. 03
(b) Explain solar water pump with its circuit diagram. 04
(c) State and explains any three network integration issues for solar and wind 07
energy sources integration with grid.

Q.5 (a) What is solar collector? Explain its uses. 03

(b) Draw the power generation by solar PV and wind turbine during 24 hours 04
of a day.
(c) Explain operation of solar pond with its applications. 07
OR
Q.5 (a) Explain operation of solar cooker with usual diagram. 03
(b) Explain solar Air Conditioner. 04
(c) Explain Solar heater in details. 07
***************************
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER– VI (NEW) EXAMINATION – WINTER 2021
Subject Code:3160917 Date:02/12/2021
Subject Name:Wind And Solar Energy
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.
4. Simple and non-programmable scientific calculators are allowed.
MARKS
Q.1 (a) Define Cut in speed, Cut out speed and Tip speed ratio 03
(b) Write Betz Law and mention betz limit value in case of wind turbine 04
Wind
(c) Classify and Explain Fixed and Variable speed wind turbines 07

Q.2 (a) List the types of generator used in wind power plant 03
(b) State role of Power electronics converter in wind power 04
(c) Explain construction and working of Doubly-Fed Induction Generators 07
with characteristics
OR
(c) Explain Converter control techniques in case of Wind power 07

Q.3 (a) Define zenith, solar altitude and azimuth angle in solar geometry 03
(b) Prove that solar day length is function of latitude and declination angle 04
(c) Explain structure of solar cell, module, panel and array 07
OR
Q.3 (a) Draw and explain V-I characteristics of a PV cell 03
(b) Compare monocystaline, polycrystalline and thin film type solar module. 04
(c) What is Maximum Power Point Tracking (MPPT) system and which types of 07
algorithms used to track maximum power from solar PV System.

Q.4 (a) Differentiate Grid-Connected System and Standalone system 03

(b) How solar water pump works? 04
(c) Explain real and reactive power regulation in case of wind power 07
OR
Q.4 (a) Mention voltage and frequency operating limits on integration of solar 03
and wind.
(b) List out Power quality issues during integration of solar –wind with grid. 04
(c) Write technical note on Solar Refrigeration and Air Conditioning 07

Q.5 (a) How Solar water heater works? 03

(b) Give the type of Solar Concentrators used in solar thermal plant 04
(c) Explain working of solar thermal plant 07
OR
Q.5 (a) What is solar pond? 03
(b) What is grid code and why it is required? 04
(c) List out application of solar –thermal systems 07

*************