MCQs on Renewable Energy Technologies (RET - 22661)

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Unit1 : Solar Thermal Systems

1. The study of various forms of energy and its conversion from one form to another is called . 

a)Energy technology                                  b) Energy science

c) Energy. 

d) Power

2. is the energy obtained from sources that are essentially inexhaustible.

a) Conventional Energy

 b) Non-renewable Energy

c) Renewable Energy 

d) None of these

3. Which of this is (are) a type of Solar Collector(s) ?

a) Flat plate collector 

b) Cylindrical Parabolic

c) Paraboloid mirror arrays 

d) All of these

4. is provided at the bottom of tubing to minimize the heat losses by conduction

a) Transparent covers 

b) Absorber plate

b) Thermal insulation 

d) Casing

5. are provided at the above of coolant passages for trapping heat received by absorber plate.

a) Transparent Cover 

b) Absorber plate

c) Thermal Insulation 

d) Casing

6. In , the solar radiations are focused on absorber or collector pipe through which the working fluid 

flows.

a) Point focusing concentrator 

b) line focusing collectors

c) Non-focusing collators 

d) none of the above

7. Which of these is not the advantage of solar water heating system ?

a) Simple to construct and install

b) No or Negligible running cost

c) It saves time and high-grade form of electric energy.

d) Requires sufficient roof space

8. Main component of solar water heating system.

a) Flat plate collector 

b) Hot water storage tank

c) Overhead tank 

d) All of these

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9. The force circulation system is which uses a mechanical pump to circulate hot water.

a) Passive system

 b) Active system

c) Open loop system 

d) None of these

10. is the example of Non-renewable energy.

a) Geothermal energy 

b) hydroelectric power

c) Nuclear energy 

d) None of these

11. The energy sources which are found are stored in nature are called .

a) Quaternary energy source 

b) Secondary energy source

c) Tertiary energy source

 d) Primary energy source

12. In system the collection, storage and distribution of solar thermal energy is done by natural 

means.

a) Active system 

b) Passive system

c) Both (a) and (b) 

d) None of these

13. The materials used for insulation should have .

a) Low thermal conductivity 

b) Stability at high temperatures

c) Non-corrosive 

d) All of these

14. In order to prevent a non-permitted pressure, increase in solar circuit, the installation for a valve is

specified.

a) Safety valve 

b) Drainage valve

c) Flow control valve 

d) Check valve

15. Range of temperature for flat plate collector is

a) 100*C to 130*C 

b) Up to 400*C

c) Up to 80*C 

d) 150*C to 300*C

Unit 2 : Solar Photovoltaic Systems

1. In order to get desired voltage, current and power, solar cells are connected in .

a) Series 

b) Parallel

c) Both (a) and (b)

 d) None of these

2. Materials of photovoltaics contains .

a) Conductors 

b) Insulators

c) Semi-Conductors 

d) All of these

3. have large number of free electrons which are free to move.

a) Conductors 

b) Insulators

c) Semi-conductors 

d) None of these

4. These materials do not have any free electrons and hence they never conduct electricity.

a) Conductors 

b) Insulators

c) Semi-conductors 

d) None of these

5. are used for storage of the solar energy.

a) Photovoltaic Array 

b) Inverter

c) Energy storage batteries 

d) None of these

6. Capacity of a battery is the total amount of energy it can store

a) Electronic 

b) Solar

c) Electrical 

d) Chemical

7. The voltage output from the PV panels varies depending upon the of light from sun.

a) Intensity 

b) Refraction

c) Reflection

 d) Deflection

8. Which one of these do not have energy storage?

a) Direct coupled stand-alone system

b)Stand-alone system with battery storage

c) Stand alone system with batteries and charge controller

d) None of these

9. is a concept which records the difference of unit consumed from utility and the units supplied to

the utility by a consumer.

a) Light bill 

b) Net marketing

c) Utility meter 

d) None of these

10. supplies power independently and continuously without any external source to meet DC and AC

loads.

a) Off-grid system b) Stand-alone system

c) Grid connected system d) Both (a) and (b)

11. Theaim of balance of system (BOS) is to .

a) Control and Conduct b) Protect components

c) Distribute power d) All of these

12. Polycrystal silicon cells have efficiency between .

a) 14% to 19% b) 10% to 19%

c) 11% to 14% d) None of these

13. Monocrystal silicon cells have efficiency between

a) 14% to 19% b) 10% to 19%

c) 11% to 14% d) None of these

14. The basic components of Photovoltaic Array are .

a) Module b) Solar cell

c) Panel d) Array

15. Which one of the following is not the application of solar PV system?

a) Power supplies b) Power source to satellites

c) Water treatment d) All of these

Unit 3 : Wind Energy Systems

1. are caused due to greater solar heating of the earth’s surface near the equator as compared to

solar heating near northern or southern poles.

a) planetary winds 

b) local winds

c) Solar winds 

d) None of these

2. Wind energy is an form of solar energy.

a) Direct 

b) Straight

c) Indirect 

d) Random

3. Darrieus type rotors consist of two or three convex blades with cross-section.

a) rectangular

 b) Aerofoil

c) Cylindrical 

d) Circular

4. Wind at surfaces is more turbulent which increases the stresses in .

a) VAWT 

b) HAWT

c) Both (a) and (b) 

d) None of these

5. The full-form of WECS is .

a) Wind Energy conversion Solitary

 b) Wind Energy Consulting Services

c) Wind Energy Conversion Systems 

d) Wind Electrical Conversion Services

6. has low cut in speed of about 8 kmph.

a) VAWT

 b) HAWT

c) Both (a) and (b)

 d) None of these

7. HAWT has blade, cut in speed of about .

a) 10 kmph

 b) 8 kmph

c) 12 kmph

 d) 16 kmph

8. The pitch of the blade is controlled automatically so as to provide the action.

a) Cooling 

b) Feathering

c) blowing

 d) Wearing

9. The mechanical energy developed by the turbine rotor is converted into electrical energy by .

a) Generator 

b) inverter

c) Guyrope 

d) Gear box

10. Wind energy generators which need the energy storage facility are called .

a) Stand-alone System

 b) Grid connected system

c) Hybrid system

 d) All of the above

11. The function of is to derive the reference voltage and frequency signals from grid and to sense

the wind speed and its direction.

a) Generator

 b) Yaw Control

c) Controller

 d) Wind turbine

12. failure of wind mill may cause its parts to fly and harm the people around them

a) Electrical 

b) Mechanical

c) Electromagnetic

 d) None of these

13. are caused due to heating of land and water in coastal areas.

a) Local Winds

 b) Solar winds

c) Planetary winds

 d) None of these

14. is the wind speed below which the machine doesnot rotate and no power is produced.

a) Cut-out speed

 b) Cut-in speed

c) Aero speed

 d) All of these

15. systems are useful since it can provide power throughout the year.

a) Wind energy power system

 b) Offshore wind energy

c) Solar wind hybrid Power

 d) None of these

Chapter no.4 Micro Hydro Power Systems

1. Which of the following is not a requirement for site selection of hydroelectric powerplant?

a) Availability of water

b) Large catchment area

c) Rocky land

d) Sedimentation

2. The amount of electrical energy that can be generated by a hydroelectric power plant depends

upon

a) Head of water

b) Quantity of water

c) Specific weight of water

d) Efficiency of Alternator

3. Potential energy of water is used to drive the turbine.

a) True

b) False

4. Hydroelectric power plant is

a) Non-renewable source of energy

b) Conventional source of energy

c) Non-conventional source of energy

d) Continuous source of energy

5. Hydroelectric power plant is generally located near load centre.

a) True

b) False

6. Hydroelectric power plant is mainly located in

a) Flat areas

b) Deserts

c) Hilly areas

d) Deltas

7. Which of the following is not an advantage of hydroelectric power plant?

a) no fuel requirement

b) low running cost

c) continuous power source

d) no standby losses

8. Which of the following statement is true about hydroelectric power plant?

a) Hydroelectric power plants are multipurpose.

b) Due to non-uniform flow of water frequency control in such plants is very difficult.

c) Hydroelectric power plant has high running cost

d) Water is used as fuel in hydroelectric power plant

9. Which element of hydroelectric power plant prevents the penstock from water hammer

phenomenon?

a) Valves and Gates

b) Draft tubes

c) Spillway

d) Surge Tank

10. Dam having very wide base as compared to its height is called

a) buttress dam

b) arch dam

c) earth dam

d) solid gravity dam

11. Spillway discharges the overflow water to the downstream side when the reservoir is full.

a) True

b) False

12. Trash racks are built for

a) discharging the water freely from the turbine exit to tailrace

b) preventing the turbine from ingress of floating and other materials

c) creating artificial head to store sufficient potential energy of water

d) controlling the opening of valves

13. Penstock in a hydroelectric power plant is

a) a pipe connected to runner outlet

b) nozzle that release high pressure water on turbine blades

c) a conduit connecting forebay to scroll case of turbine

d) a pipe connecting surge tank to dam

14. The pressure at the inlet or exit of the draft tube should notbe

a) less than one third of atmospheric pressure

b) greater than one third of atmospheric pressure

c) less than one atmospheric pressure

d) greater than one atmospheric pressure

15. Draft tube increases the operating head on the turbine.

a) True

b) False

16. Which statement about surge tank is wrong?

a) Ideal location of surge tank is at the turbine inlet

b) A decrease in load demands cause a rise in water level in surge tank

c) Surge tanks are totally closed to avoid entry of unwanted objects to penstock

d) Surge tanks are installed to reduce harm effects of water hammer phenomenon

17. Trash racks are located

a) near tailrace

b) at the entrance of turbine

c) inside penstock

d) intake

18. What is the function of booms?

a) It supports the dam

b) It supports the penstock

c) It divert the Icebergs from flowing into the penstock

d) To hold the turbine structure

Chapter no. 5 Bio Energy system

1. Which of the following are the benefits/uses of biogas?

1) Bio-manure is obtained

2) Improves sanitation in village

3) Reduce causes of climate change

a. 1

b. 2, 3

c. 1, 3

d. All of the above

2. The term biomass most often refers to 

a) Inorganic matter

b) Organic matter

c) Chemicals

4. None of the above

19. Ethanol refers to any biofuel made from:

a) Grass

b) corn

c) plant carbohydrates

d) None of the above

20. What's the primary source of biodiesel?

a) Soybeans

b) plant oil

c) animal fat

d) None of the above

Chapter no.6

Renewable Energy hybrid systems and Feasibility Studies

21. Renewable Hybrid system consist of how many no. ofNatural

systems/resources.

a) Zero

b) One

c) Two or more

d) None of the above

22. Absorption of Solar radiations at earth’s surface occur due to presence of

(A) Ozone

(B) Water vapours

(C) Carbon di-oxide

(D) All of the above

23. Photovoltaic solar energy conversion system makes use of

(A) fuel cell

(B) solar cell

(C) solar pond

(D) none of the above.

24. Solar cells are made of

(A) silicon

(B) germanium

(C) silver

(D) aluminium.

25.The voltage of a single solar cell is

(A) 0.5 V

(B) 1 V

(C) 1.1 V

(D) 5 W.

26. The major disadvantage, with solar cells for power generation is

(A) lack of availability

(B) large area requirement

(C) variable power

(D) high cost.

27. The maximum theoretical efficiencies of solar sales could be around

(A) 99%

(B) 60%

(C) 48%

(D) 1%.

28. The source of energy for satellite is

(A) battery