MCQs REE jdjsj ksjsjsjjj jdjdjjjdjjnnnnjikhbksk dhhjsnnshsjsjsjbsbsbsjdjdkd jdksjdjdjdjdjf PDF

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Renewable Energy Engineering MCQs For GTU Semester – 8 B.E. Mechanical Engineering

Ahmedabad | Gandhinagar Mo. 9974460008, 9979790003 http://www.youtube.com/c/SANKALPEDUCATIONGPSC https://t.me/gpscmech_SE http://tiny.cc/1x4cmz

Unit-1 Scenario of Renewable Energy (RE) Sources 1.

Which of the following are examples of renewable sources? (A) Sunlight (B) Air (C) Water (D) All of the above Answer: (D)

2.

Which of the following is the disadvantage of most of the renewable energy sources? (A) Unreliable supply (B) Highly polluting (C) High waste disposal cost (D) High running cost Answer: (A)

3.

Which of the following is non-renewable energy resource? (A) fuel cells (B) wind power (C) wave power (D) coal Answer: (D)

4.

Which parameter is used as an index for the standard of living of the people of a country? (A) Industrial production (B) Number of vehicles per house (C) Per capita energy consumption (D) Population density Answer: (C)

5.

Which of the following area can often replace conventional fuel by renewable energy? (A) Space heating (B) Transportation (C) Electricity generation (D) All of the above Answer: (D)

6.

Consider the following statement: Out of energy, economy, and environment …………………… (A) only energy and environment are related (B) only energy and economy are related

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(C) all the three are interrelated (D) all the three are independent Answer: (C) 7.

The resources that are inexhaustible and replace by nature are known as (A) non- renewable resources (B) renewable resources (C) conventional resources (D) non-natural resources Answer: (B)

8.

Which renewable resource generate maximum power in India? (A) Wind (B) Solar (C) Geothermal (D) Biomass Answer: (B)

9.

Global warming is mainly caused due to (A) emissions of heat from engines (B) emission of CO2 due to the burning of fossil fuels (C) use of nuclear energy (D) air pollution Answer: (B)

10.

Global warming would lead to (A) reduced ozone depletion (B) acid rains (C) change of climate pattern and its severity (D) increase in the efficiency of heat engines Answer: (C)

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Unit-2 Solar Energy 1.

Which of the following energy has the greatest potential among all the sources of renewable energy? (A) Solar energy (B) Wind energy (C) Thermal energy (D) Hydro-electrical energy Answer: (A)

2.

What is the total amount of solar energy received by earth and the atmosphere? (A) 12.8 ×1024 J/Year (B) 2.8 ×1024 J/Year (C) 22.8 ×1024 J/Year (D) 3.8 ×1024 J/Year Answer: (D)

3.

Which is the most common source of energy from which electricity is produced in India? (A) Hydroelectricity (B) Wind energy (C) Coal (D) Solar energy Answer: (C)

4.

In which form, solar energy is radiated from the sun? (A) Ultraviolet Radiation (B) Electromagnetic waves (C) Infrared radiation (D) Transverse waves Answer: (B)

5.

Approximately ______ of energy striking the outer atmosphere of the earth reaches its surface. (A) 30 % (B) 45 % (C) 50 % (D) 47 % Answer: (D)

6.

Solar radiation includes

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(A) visible light, ultraviolet light (B) infrared, radio waves (C) X-rays, and gamma rays (D) All of the above Answer: (D) 7.

Which is the most dangerous radiation? (A) Alpha radiation (B) Beta radiation (C) Gamma radiation (D) All of the above Answer: (A)

8.

Sunlight at Earth's surface is around (A) 52 to 55 % infrared (B) 52 to 65 % infrared (C) 20 to 55 % infrared (D) 52 to 75 % infrared Answer: (A)

9.

Sunlight at Earth's surface is around (A) 42 to 63 % visible (B) 32 to 43 % visible (C) 22 to 73 % visible (D) 42 to 43 % visible Answer: (D)

10.

Sunlight at Earth's surface is around (A) 0.6 to 0.10 % ultraviolet (B) 3 to 5 % ultraviolet (C) 0.3 to 0.8 % ultraviolet (D) 0.1 to 0.5 % ultraviolet Answer: (B)

11.

The scattered solar radiation is called ____________ (A) Direct Radiation (B) Beam Radiation (C) Diffuse radiation (D) Infrared Radiation Answer: (C)

12.

Solar radiation which reaches the surface without scattering or absorbed is called _____________ (A) Beam Radiation

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(B) Infrared radiation (C) Ultraviolet radiation (D) Diffuse radiation Answer: (A) 13.

Which of the following type of energy is stored as latent heat? (A) Chemical energy (B) Thermal energy (C) Electrical energy (D) Mechanical energy Answer: (B)

14.

Direct Solar energy is used for (A) water heating (B) distillation (C) drying (D) all of the above Answer: (D)

15.

The power from the sun intercepted by the earth is approximately (A) 1.8×109 MW (B) 1.8×1015 MW (C) 1.8×1011 MW (D) 1.8×1019 MW Answer: (C)

16.

Which of the following is an indirect method of Solar energy utilization? (A) Wind energy (B) Biomass energy (C) Wave energy (D) All of the above Answer: (D)

17.

The ratio of the beam radiation flux falling on a tilted surface to that falling on a horizontal surface is called the (A) Radiation shape factor (B) Tilt factor (C) Slope (D) None of the above Answer: (B)

18.

Beam radiations are measured with the help of (A) Anemometer (B) Sunshine recorder

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(C) Pyrheliometer (D) None of the above Answer: (C) 19.

Diffused radiation has (A) no Unique direction (B) unique direction (C) short-wavelength as compared to beam radiation (D) large magnitude as compared to beam radiation Answer: (A)

20.

Global radiation is given by (A) Direct radiation / Diffuse Radiation (B) Direct radiation − Diffuse Radiation (C) Diffuse Radiation / Direct radiation (D) Direct radiation + Diffuse Radiation Answer: (D)

21.

Solar radiation flux is usually measured with the help of a (A) Pyranometer (B) Anemometer (C) Sunshine recorder (D) None of the above Answer: (A)

22.

Reflecting mirrors used for exploiting solar energy is known as (A) Mantle (B) Ponds (C) Diffusers (D) Heliostats Answer: (D)

23.

The global radiation reaching a horizontal surface on the earth is given by (A) Total beam radiation / Hourly diffuse radiation (B) Hourly beam radiation / Hourly diffuse radiation (C) Hourly beam radiation + Hourly diffuse radiation (D) Hourly beam radiation − Hourly diffuse radiation Answer: (C)

24.

A pyranometer is used for measurement of (A) Direct as well as diffuse radiation (B) Direct radiation only (C) Diffuse radiation only (D) None of the above

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Answer: (A) 25.

Most widely used solar material is (A) Arsenic (B) Silicon (C) Cadmium (D) Steel Answer: (B)

26.

For satellite, the source of energy is (A) Cryogenic storage (B) Battery (C) Solar cell (D) Any of the above Answer: (D)

27.

Solar energy can be directly converted into electrical energy by (A) photoelectric cell (B) dry cell (C) rechargeable cell (D) battery Answer: (A)

28.

Solar energy can be used to cook food in (A) solar cooker (B) woodstove (C) gas oven (D) traditional oven Answer: (A)

29.

Solar energy can be used to heating water through (A) solar water heating system (B) photoelectric cell (C) solar batteries (D) dry cell Answer: (A)

30.

Solar energy can be converted into (A) thermal energy only (B) electrical energy only (C) both thermal energy and Electrical energy (D) none of the above Answer: (C)

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31.

The value of solar constant can be given as __________ (A) 1367 W/m2 (B) 1377 W/m2 (C) 1477 W/m2 (D) 1479 W/m2 Answer: (A)

32.

Temperature on the sun is around ______________ (A) 575 – 600 K (B) 7550 – 8000 K (C) 4570 – 6000 K (D) 5750 – 6000 K Answer: (D)

33.

The complement of the zenith angle is (A) Solar altitude angle (B) Surface azimuth angle (C) Solar azimuth angle (D) Slope Answer: (A)

34.

Angle made by a plane surface with horizontal is called ________ (A) Altitude angle (B) Zenith angle (C) Slope (D) Hour Angle Answer: (C)

35.

Air mass ratio is minimum (A) when the sun is at the zenith (B) at sunrise (C) at sunset (D) none of the above Answer: (A)

36.

The angle of deviation of the normal to the surface from the local meridian is called _________ (A) Solar azimuth angle (B) Surface azimuth angle (C) Solar altitude (D) Hour angle Answer: (B)

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37.

The angle is measured from a plane and which is equal to the angle between the beam of rays and normal to the plane is called __________ (A) Declination (B) Azimuth angle (C) Hour angle (D) Incident angle Answer: (D)

38.

For a one-degree change in longitude, the change in solar time is (A) 4 seconds (B) 1 minute (C) 4 minutes (D) 15 minutes Answer: (C)

39.

The time from sunrise to sunset is termed as _______________ (A) slope (B) day length (C) local solar time (D) solar intensity Answer: (B)

40.

What is the angle of declination on the 305th day of year and what day is it? (A) −15.06°, November 1 (B) −15.06°, November 2 (C) −55.06°, November 2 (D) −35.06°, November 2 Answer: (A)

41.

What is the angle of declination on May 12 considering it’s a leap year? (A) 30.2° (B) 30.4° (C) 30.34° (D) 20.34° Answer: (D)

42.

Surface azimuth angle varies from (A) −90° to 180° (B) −180° to 180° (C) −90° to 270° (D) −90° to 360° Answer: (B)

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43.

The angle made in the horizontal plane between the horizontal line due south and the projection of the normal to the surface on the horizontal plane is (A) Surface azimuth angle (B) Hour angle (C) Declination (D) Solar altitude angle Answer: (A)

44.

The hour angle is equivalent to (A) 77° per hour (B) 65° per hour (C) 25° per hour (D) 15° per hour Answer: (D)

45.

The sun subtends an angle of _____ minutes at the earth’s surface. (A) 33 (B) 32 (C) 30 (D) 35 Answer: (B)

46.

The zenith angle is the angle made by the sun’s rays with the ____ to a ______ surface. (A) tangent, horizontal (B) normal, vertical (C) normal, horizontal (D) tangent, vertical Answer: (C)

47.

To how many types are flat plate collectors divided depending on the type of heat transfer fluid? (A) 3 (B) 2 (C) 4 (D) 5 Answer: (B)

48.

The function of a solar collector is of converting solar energy into (A) radiations (B) thermal energy (C) electrical energy (D) all of the above Answer: (B)

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49.

Liquid heating collectors are mainly used for _________ (A) cooking (B) generating electricity (C) heating water (D) trapping sunlight Answer: (C)

50.

Which of the following member limits the radiation and convection heat losses. (A) Absorber plate (B) Transparent cover (C) Selective surface (D) Insulation Answer: (B)

51.

Which is provided to minimize heat loss? (A) Insulation (B) Absorber plate (C) Surface plate (D) Casing Answer: (A)

52.

Which part of flat plate collectors is coated in black? (A) Transparent cover (B) Insulation (C) Absorber plate (D) Fins Answer: (C)

53.

The frame which contains all the parts is called __________ (A) box (B) plate (C) enclose (D) container Answer: (D)

54.

In which collector does airflow without any obstruction? (A) Porous absorber plate (B) Non-porous absorber plate (C) Overlapped glass absorber (D) Finned absorber Answer: (B)

55.

In which absorber matrix material is arranged and the back-absorber plate is eliminated?

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(A) Non-porous absorber plate (B) Overlapped glass absorber (C) Finned absorber (D) Porous absorber plate Answer: (D) 56.

Which type of absorber increases the heat transfer area over a simple flat plate absorber of the same capacity? (A) Finned absorber (B) Porous absorber plate (C) Non-porous absorber plate (D) Overlapped glass absorber Answer: (A)

57.

In which type of absorber plate is the overall flow direction is along with the absorber glass plate? (A) Finned absorber (B) Overlapped glass absorber (C) Non-porous absorber plate (D) Porous absorber plate Answer: (B)

58.

How is heat loss overcome in liquid plate collectors? (A) By casing (B) By the transparent cover (C) By insulation (D) From provided tubes Answer: (C)

59.

A liquid flat-plate collector is usually held tilted in a fixed position, facing _____ if located in the northern hemisphere. (A) South (B) North (C) East (D) West Answer: (A)

60.

Maximum efficiency is obtained in (A) Flat plate collector (B) Evacuated tube collector (C) Line focusing collector (D) Paraboloid dish collector Answer: (D)

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61.

The value of the concentration ratio of a flat plate collector is (A) 1 (B) 100 (C) 10 (D) 1000 Answer: (A)

62.

In evacuated tube collectors (A) only conduction losses are suppressed (B) both conductions, as well as convection losses, are suppressed (C) only convection losses are suppressed (D) only radiation losses are suppressed Answer: (B)

63.

Which of the following type of collector is used for low-temperature systems? (A) Line focusing parabolic collector (B) Paraboloid dish collector (C) Flat plate collector (D) None of the above Answer: (C)

64.

In the paraboloid dish concept, the concentrator tracks the sun by rotating about (A) One axis (B) Two axis (C) Three axis (D) None of the above Answer: (B)

65.

Flat plate collector absorbs (A) direct radiation only (B) diffuse radiation only (C) direct and diffuse both (D) none of the above Answer: (C)

66.

Temperature attained by a flat-plate collector is a range of (A) 90 °C (B) 150 °C (C) 250 °C (D) 350 °C Answer: (A)

67.

In Parabolic Trough Collector temperature attained in the range of (A) 350 °C

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(B) 400 °C (C) 450 °C (D) 650 °C Answer: (B) 68.

A cylindrical parabolic concentrator requires (A) 2-axis tracking (B) 1-axis tracking (C) no tracking (D) seasonal adjustment Answer: (B)

69.

A Scheffler Solar concentrator has (A) 1-axis tracking (B) seasonal adjustment (C) 2-axis tracking (D) no tracking Answer: (C)

70.

Concentrated solar power (CSP) systems use ____ to focus a large area of sunlight into a small beam. (A) Lenses (B) Mirrors (C) Trackers (D) All of the above Answer: (D)

71.

The ratio of energy actually absorbed and transferred to the heat-transport fluid by the collector is known as (A) collector efficiency (B) concentration ratio (C) temperature range (D) none of the above Answer: (A)

72.

The ratio of the area of the aperture of the system to the area of the receiver is known as (A) collector efficiency (B) concentration ratio (C) temperature range (D) none of the above Answer: (B)

73.

The absorber plate is usually made from a metal sheet ranging in thickness from

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(A) 0.8 to 3 mm (B) 0.7 to 6 mm (C) 0.5 to 5 mm (D) 0.2 to 1 mm Answer: (D) 74.

In which design of absorber plate liquid flows only in the pipe? (A) Rectangular or cylindrical full sandwich (B) Pipe and fin-type (C) Roll bond (D) All of the above Answer: (B)

75.

In which design of absorber plate wetted area and water capacity are high? (A) Rectangular or cylindrical full sandwich (B) Pipe and fin-type (C) Roll bond (D) All of the above Answer: (A)

76.

For low-temperature requirements such as warming of a swimming pool which type absorber suitable? (A) Pipe and fin-type (B) Roll bond (C) Rectangular or cylindrical full sandwich (D) All of the above Answer: (C)

77.

For domestic and industrial applications which type absorber suitable? (A) Rectangular or cylindrical full sandwich (B) Pipe and fin-type (C) Roll bond (D) All of the above Answer: (B)

78.

Compound parabolic concentrator consists of (A) One parabolic mirror segment (B) Two parabolic mirror segments (C) Three parabolic mirror segments (D) No parabolic mirror segments Answer: (B)

79.

In Compound Parabolic Concentrator, concentration the ratio is between (A) 3 to 7

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(B) 3 to 10 (C) 3 to 8 (D) 3 to 12 Answer: (A) 80.

In Cylindrical Parabolic Concentrator, the concentration ratio is between (A) 5 to 10 (B) 5 to 20 (C) 5 to 30 (D) 5 to 40 Answer: (C)

81.

In Linear Fresnel Lens Collector, the concentration ratio is between (A) 10 to 30 (B) 10 to 35 (C) 10 to 40 (D) 10 to 45 Answer: (A)

82.

Approximately how much amount of temperature achieved in Paraboloidal Dish Collector? (A) 1000 °C (B) 2000 °C (C) 2500 °C (D) 3000 °C Answer: (D)

83.

Hemispherical Bowl Mirror Concentrator requires (A) two-axis tracking (B) one-axis tracking (C) three-axis tracking (D) not required Answer: (A)

84.

In Central Tower Receiver concentration ratio is (A) 1000 (B) 1500 (C) 3000 (D) 2000 Answer: (C)

85.

When hot water is taken out from the hot water outlet, the same is replaced by cold water from cold water makeup tank fixed above ...