Questions and answers for exam Preparation

MCQs

Total Questions : 60 | Page 3 of 6 pages

Question 21. What is the temperature difference used in ocean thermal energy conversion? Note that F denotes Fahrenheit.

10° F
A minimum of 77° F
Between 50 and 60° F
A minimum of 100° F

Discuss Question

Answer: Option B. -> A minimum of 77° F
Answer: (b).A minimum of 77° F

Question 22. What is the maximum estimated potential of ocean thermal energy conversion per year?

80 GWh
900 MWh
10000 TWh
88000 TWh

Discuss Question

Answer: Option D. -> 88000 TWh
Answer: (d).88000 TWh

Question 23. What is ocean thermal energy conversion?

Harnessing the temperature differences between surface waters and deep ocean waters
Harnessing the temperature differences between the coastal waters and deep ocean waters
Harnessing the heat energy from the underwater volcanoes
Harnessing the heat energy between surface water vapour and atmospheric gases

Discuss Question

Answer: Option A. -> Harnessing the temperature differences between surface waters and deep ocean waters
Answer: (a).Harnessing the temperature differences between surface waters and deep ocean waters

Question 24. What is thermohaline circulation?

Circulation of halogens throughout the ocean
Circulation of halogens due to temperature differences throughout the ocean
Large scale ocean circulation driven by global density gradients
Large scale halogens circulation due to global density gradients

Discuss Question

Answer: Option C. -> Large scale ocean circulation driven by global density gradients
Answer: (c).Large scale ocean circulation driven by global density gradients

Question 25. How does the cold and denser water masses sink to the depths of ocean?

Thermohaline circulation
Temperature gradient
Density gradient
Freshwater fluxes

Discuss Question

Answer: Option A. -> Thermohaline circulation
Answer: (a).Thermohaline circulation

Question 26. Which of the following best describes the open-cycle OTEC?

Warm surface seawater → heat exchanger → working fluid → turbine
Warm surface seawater → low-pressure container → turbine/generator
Deep seawater → heat exchanger → working fluid → turbine
Deep seawater → low-pressure container → turbine/generator

Discuss Question

Answer: Option B. -> Warm surface seawater → low-pressure container → turbine/generator
Answer: (b).Warm surface seawater → low-pressure container → turbine/generator

Question 27. Why does an open-cycle OTEC use low-pressure container?

To solidify the warm surface seawater
To evaporate the deep seawater
To boil and evaporate the warm surface seawater
To solidify the warm surface seawater

Discuss Question

Answer: Option C. -> To boil and evaporate the warm surface seawater
Answer: (c).To boil and evaporate the warm surface seawater

Question 28. Where is the desalinized fresh water used?

Sent back into ocean
Used for irrigation and aquaculture
Used to generate electricity
Used to generate tides

Discuss Question

Answer: Option B. -> Used for irrigation and aquaculture
Answer: (b).Used for irrigation and aquaculture

Question 29. Why does open-cycle OTEC produce desalinized fresh water?

Because the vapourised surface seawater leaves all the salts and contaminants in the low-pressure container
Because of the working fluid
Because the warm surface seawater is mixed with deep ocean water
Because of thermohaline circulation

Discuss Question

Answer: Option A. -> Because the vapourised surface seawater leaves all the salts and contaminants in the low-pressure container
Answer: (a).Because the vapourised surface seawater leaves all the salts and contaminants in the low-pressure container

Question 30. Which of the following produces desalinized fresh water?