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MCQs

Total Questions : 207 | Page 20 of 21 pages
Question 191. How does heat engine convert thermal and chemical energy to mechanical energy?
  1.    With the help of steam
  2.    By converting the input energy into electrical energy which is then used to drive mechanical systems
  3.    By bringing a working substance from a higher state temperature to a lower state temperature
  4.    By converting the input electrical energy to mechanical energy
 Discuss Question
Answer: Option C. -> By bringing a working substance from a higher state temperature to a lower state temperature
Answer: (c).By bringing a working substance from a higher state temperature to a lower state temperature
Question 192. Which of the following best describes the flow of energy in a solar thermo-mechanical system?
  1.    Solar → thermal → mechanical → electricity
  2.    Electricity → thermal → mechanical → solar
  3.    Mechanical → solar → electricity → thermal
  4.    Solar → electricity → thermal → mechanical
 Discuss Question
Answer: Option A. -> Solar → thermal → mechanical → electricity
Answer: (a).Solar → thermal → mechanical → electricity
Question 193. Which of the following is used to make a glass-glass evacuated tubes?
  1.    Borosilicate glass
  2.    Carbon
  3.    Wood
  4.    Plastic coating
 Discuss Question
Answer: Option A. -> Borosilicate glass
Answer: (a).Borosilicate glass
Question 194. Why does flat plate collector perceived to have higher efficiency than evacuated tube solar collector in terms of area?
  1.    Because flat plate collector has a large installation area
  2.    Because evacuated tube collector is compact
  3.    Because of the vacuum gap in evacuated tube collectors
  4.    Because of the vacuum gap in flat plate collectors
 Discuss Question
Answer: Option C. -> Because of the vacuum gap in evacuated tube collectors
Answer: (c).Because of the vacuum gap in evacuated tube collectors
Question 195. Which of the following are combined to form an evacuated flat plate solar collector?
  1.    Flat plate solar collectors and evacuated-tube solar collectors
  2.    Flat plate solar collectors and bowl collectors
  3.    Bowl collectors and evacuated-tube solar collectors
  4.    Polymer collectors and bowl collectors
 Discuss Question
Answer: Option A. -> Flat plate solar collectors and evacuated-tube solar collectors
Answer: (a).Flat plate solar collectors and evacuated-tube solar collectors
Question 196. Which of the following is a problem with evacuated tubes?
  1.    Underheating
  2.    Overheating
  3.    Poor absorption of sunlight
  4.    Poor reception of sunlight
 Discuss Question
Answer: Option B. -> Overheating
Answer: (b).Overheating
Question 197. _______ lose more heat to the environment than evacuated-tube solar collectors.
  1.    Photovoltaics
  2.    Solar stills
  3.    Solar air conditioners
  4.    Flat-plate collectors
 Discuss Question
Answer: Option D. -> Flat-plate collectors
Answer: (d).Flat-plate collectors
Question 198. What is solar water heater?
  1.    Use solar energy to heat water
  2.    Use solar energy to generate current which is then used to heat water
  3.    Use water to generate heat
  4.    Use solar energy to generate steam
 Discuss Question
Answer: Option A. -> Use solar energy to heat water
Answer: (a).Use solar energy to heat water
Question 199. Which of the following determines complexity and size of solar water heating system?
  1.    Food
  2.    Changes in ambient temperature
  3.    Chemicals
  4.    Solar radiation constant
 Discuss Question
Answer: Option B. -> Changes in ambient temperature
Answer: (b).Changes in ambient temperature
Question 200. How does freeze-tolerance work?
  1.    By expansion of pipes carrying transfer fluid
  2.    By compression of pipes carrying transfer fluid
  3.    By increasing the temperature of pipes carrying transfer fluid
  4.    By increasing the pressure inside pipes carrying transfer fluid
 Discuss Question
Answer: Option A. -> By expansion of pipes carrying transfer fluid
Answer: (a).By expansion of pipes carrying transfer fluid

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