Questions and answers for exam Preparation

MCQs

Total Questions : 207 | Page 9 of 21 pages

Question 81. Which of the following is generally used as circulating fluid in tropical and sub-tropical climates?

A mixture of ethylene glycol and water
Water
A mixture of propylene glycol and water
Glycerol

Discuss Question

Answer: Option B. -> Water
Answer: (b).Water

Question 82. Which of the following is generally used as circulating fluid in freezing climates?

Liquid carbon dioxide
Water
A mixture of propylene glycol and water
Liquid nitrogen

Discuss Question

Answer: Option C. -> A mixture of propylene glycol and water
Answer: (c).A mixture of propylene glycol and water

Question 83. Which of the following is a circulating fluid in evacuated flat-plate solar collectors?

Water
Steam
Nitrogen
Hydrogen

Discuss Question

Answer: Option B. -> Steam
Answer: (b).Steam

Question 84. Adding antifreeze agents to water _________

increases its durability as coolant
decreases its durability as coolant
turns water into a coolant
prevents water from acting as a coolant

Discuss Question

Answer: Option A. -> increases its durability as coolant
Answer: (a).increases its durability as coolant

Question 85. Why are antifreeze solutions (antifreeze agents with water) used as coolants in freezing climates?

To increase boiling point of water
To decrease boiling point of water
To increase freezing point of water
To decrease freezing point water

Discuss Question

Answer: Option D. -> To decrease freezing point water
Answer: (d).To decrease freezing point water

Question 86. What are concentrated solar powered systems?

Systems that use only a small concentrated portion of sunlight
Systems that generate solar power by using photovoltaics
Systems that generate solar power by using mirrors and lenses to absorb concentrate a large area of sunlight onto an absorber
Systems that generate solar power by using mirrors and lenses to concentrate a large area of sunlight onto a receiver

Discuss Question

Answer: Option D. -> Systems that generate solar power by using mirrors and lenses to concentrate a large area of sunlight onto a receiver
Answer: (d).Systems that generate solar power by using mirrors and lenses to concentrate a large area of sunlight onto a receiver

Question 87. Which of the following does a heliostat consist of?