Solar Thermal System
1. A pyrometer is used for the measurements of
A. Diffused radiations only.
B. Direct radiations only.
C. Both direct and diffused radiations.
D. None of the above
ANSWER:C.
2. Reflector mirrors used for exploiting the solar energy are called
A. Mantle.
B. Heliostats.
C. Diffusers.
D. Ponds.
ANSWER:D. Heliostats.
3. The function of a solar collector is of converting solar energy into
A. Radiations
B. Electrical energy directions.
C. Thermal energy.
D. All of these
ANSWER:C. Thermal energy.
4. What are pyrheliometers?
A. Instruments measures beam radiations
B. Diffuse radiations.
C. Direct radiations only.
D. None of the above
ANSWER:A. Instruments measures beam radiations
5. Temperature attained by cylindrical parabolic collector is of the order of
A. 50 – 100 °C
B. 100 – 150 °C
C. 150 – 200 °C
D. 200 – 300 °C
ANSWER:D. 200 – 300 °C
6. In a solar collector, why is the transparent cover provide for?
A. Protect the collector from dust.
B. Reduce the heat losses from collector beneath to atmosphere.
C. Transmit solar radiation only
D. All of the above.
ANSWER:D. All of the above
7. In the paraboloid dish concept, the concentrator tracks the sun by rotating about
A. One axes
B. Two axes
C. Three axes
D. None of the above
Answer:B Two axes
8. Which of the following type of collector is used for low temperature systems?
A Flat plate collector
B Line focussing parabolic collector
C Paraboloid dish collector
D All of the above
Answer:A Flat plate collector
9. Maximum efficiency is obtained in
A Flat plate collector
B Evacuated tube collector
C Line focussing collector
D Paraboloid dish collector
Answer:D Paraboloid dish collector
10. The collection efficiency of Flat plate collector can be improved by
A. putting a selective coating on the plate
B. evacuating the space above the absorber plate
C. both (A) and (B)
D. None of the above
Answer: C. both A and B
11. A liquid flat plate collector is usually held tilted in a fixed position, facing .......if located in the northern hemisphere.
A. North
B. South
C. East
D. West
Answer:B South
12. The function of a solar collector is to convert.......
A. Solar Energy into Electricity
B. Solar Energy radiation
C. Solar Energy into thermal energy
D. Solar Energy mechanical energy
Answer:C Solar Energy into thermal energy
13. Flat plate collector absorbs.......
A. Direct radiation only
B.Diffuse radiation only
C.Direct and diffuse both
D.All of the above
Answer: C.Direct and diffuse both
14. Temperature attained by a flat-plate collector is of the........
A. Order of about 900C
B. Range of 1000C to 1500C
C. Above 1500C
D. None of the above
Answer: A. Order of about 900C
15. To how many types are flat plate collectors divided depending on type of heat transfer fluid?
A) 2
B) 3
C) 4
D) 5
Answer: A
16. For what purpose are Gas heating collectors used?
A) To trap solar radiance
B) To act as a medium to help in conversion of sunlight to electrical energy
C) Employed as solar air heaters
D) They act as alternate panels in case of failure
Answer: C
17. Liquid heating collectors are mainly used for
A) heating water
B) generating electricity
C) cooking
D) trapping sunlight
Answer: A
18....... is a glazing which limits the radiation and convection heat losses.
A) Absorber plate
B) Selective surface
C) Insulation
D) Transparent cover
Answer: D
19. What are provided to minimize heat loss?
A) Absorber plate
B) Surface plate
C) Insulation
D) Casing
Answer: C
20. Which part of flat plate collectors is coated in black?
A) Transparent cover
B) Absorber plate
C) Insulation
D) Fins
Answer: D
21. The frame which contains all the parts is called
A) box
B) plate
C) enclose
D) container
Answer: D
22. In which collector does air flow without any obstruction?
A) Porous absorber plate
B) Non-porous absorber plate
C) Over lapped glass absorber
D) Finned absorber
Answer: B
23. In which absorber matrix material is arranged and the back absorber plate is eliminated?
A) Porous absorber plate
B) Non-porous absorber plate
C) Over lapped glass absorber
D) Finned absorber
Answer: A
24. Which type of absorber increases the heat transfer area over a simple flat plate absorber of the same capacity?
A) Porous absorber plate
B) Non-porous absorber plate
C) Over lapped glass absorber
D) Finned absorber
Answer: D
25. In which type of absorber plate is the overall flow direction is along the absorber glass plate?
A) Overlapped glass absorber
B) Finned absorber
C) Non-porous absorber plate
D) Porous absorber plate
Answer: A
26. How is heat loss over come in liquid plate collectors?
A) By insulation
B) By casing
C) By the transparent cover
D) From provided tubes
Answer: A
27. The power from the sun intercepted by the earth is approximately
A 1.8 x 108 MW
B 1.8 x 1011 MW
C 1.8 x 1014 MW
D 1.8 x 1017 MW
Answer:B 1.8 x 1011 MW
28. Direct Solar energy is used for
A Water heating
B Distillation
C Drying
D All of the above
Answer: All of the above
29. Which of the following is not a concentrating type collector?
A. Parabolic Trough Collector
B. Parabolic Dish Collector
C. Flat Plate Collector
D. None of the Above
Answer – B. Flat Plate Collector
30. Identify the nearby collector
A. Fresnel Lens Collector
B. Flat Plate Collector
C. Paraboloid Dish Collector
D. Parabolic Trough Collector
Answer- B. Flat Plate Collector
31. Identify the nearby collector
A. Fresnel Lens Collector
B. Flat Plate Collector
C. Paraboloid Dish Collector
D. Parabolic Trough Collector
Answer- D.
32. Identify the nearby collector
A. Fresnel Lens Collector
B. Flat Plate Collector
C. Paraboloid Dish Collector
D. Parabolic Trough Collector
Answer- C. Paraboloid Dish Collector
33. Identify the nearby collector
A.Linear Fresnel Reflector
B.Flat Plate Collector
C.Paraboloid Dish Collector
D.Parabolic Trough Collector
Answer- A.
34. Identify the adjacent solar application.
A.Solar Still
B.Solar Tower
C.Solar Cell
D.Solar Cooker
Answer – A. Solar Still
35. Identify the adjacent solar application.
A.Solar Still
B.Solar Tower
C.Solar Cell
D.Solar Cooker
Answer – B. Solar Tower
36. Identify the adjacent solar application.
A.Solar Still
B.Solar Tower
C.Solar Cell
D.Solar Cooker
Answer – D. Solar Cooker
37. What are the types of concentrated collectors?
A.Point Focusing
B.Line Focusing
C.Both A & B
D.None of the Above
Answer – C. Both A & B
38. Which of the following is line focusing collector?
A.Linear Fresnel Reflector
B.Flat Plate Collector
C.Paraboloid Dish Collector
D.Parabolic Trough Collector
Answer – D. Parabolic Trough Collector
39. Which of the following is used to purify the dirty water?
A.Solar Still
B.Solar Tower
C.Solar Cell
D.Solar Cooker
Answer.A Solar Still
40. Flat plate collector can utilize
A.Diffuse radiations
B.Beam radiations
C.Both A & B
D.None of the above
Answer – C.
41. In case of focusing collectors utilized.
A.Diffuse radiations
B.Beam radiations
C.Both A & B
D.None of the above Answer –
Answer. B. Beam radiation
42. Concentration ratio of Paraboloidal dish collector is
A.of the order 10
B.of order of 100
C.of order of 1,000
D.of order of 10,000
Answer- D.of order of 10,000
43. In line focusing concentrator, the absorber is_
A.Small Volume
B.Pipe
C.Tank
D.Boiler
Answer- B. Pipe
44. Sloping cover of solar still is made up of what?
A.Plastic
B.Glass
C.Either A or B
D.Neither A or B
Answer – C. Either A or B
45. Identify the adjacent Instrument.
A.Pyranometer
B.Pyrheliometer
C.Sunshine recorder
D.None of the above
Answer- A. Pyranometer
46. Identify the adjacent Instrument.
A.Pyranometer
B.Pyrheliometer
C.Sunshine recorder
D.None of the above
Answer- A. Pyrheliometer
47. Identify the adjacent Instrument.
A.Pyranometer
B.Pyrheliometer
C.Sunshine recorder
D.None of the above
Answer- A. Sunshine Recorder
48. Which is from the following is not a point focusing concentrator?
A.Parabolic Trough Collector
B.Parabolic Dish Collector
C.Mirror-strip Solar Collector
D.Fresnel Lens Collector
Answer- Parabolic Trough Collector
49. Identify Adjacent Collector.
A.Parabolic Trough Collector
B.Parabolic Dish Collector
C.Mirror-strip Solar Collector
D.Fresnel Lens Collector
Answer- Mirror-strip Collector
50. In non-focusing type collectors:
A.Absorber area is less than collector area
B.Absorber area is more than collector area
C.Absorber area is same as collector area
D.There is no such relation
Answer- C. Absorber area is same as collector area
