Q.1
What type of working fluids do closed-cycle ocean thermal energy conversion (OTEC) systems use?
  • a) Low boiling point fluids at atmospheric pressure
  • b) High boiling point fluids at atmospheric pressure
  • c) Low boiling point fluids at 100 bar
  • d) High boiling point fluids at 100 bar
Q.2
What is the warm surface seawater pumped through in a closed-cycle ocean thermal energy conversion (OTEC) system?
  • a) Heat compressor
  • b) Heat exchanger
  • c) Fluid compressor
  • d) Turbine
Q.3
How is the vapourised working fluid condensed in a closed-cycle ocean thermal energy conversion system?
  • a) Warm surface seawater
  • b) Fresh warm water
  • c) Cold water from deep ocean
  • d) Fresh cold water
Q.4
Which of the following organisations developed the “mini OTEC”?
  • a) CERN
  • b) NASA
  • c) ISRO
  • d) Natural Energy Laboratory
Q.5
The open-cycle OTEC uses working fluid.
  • a) False
  • b) True
Q.6
Which of the following best describes the open-cycle OTEC?
  • a) Warm surface seawater → heat exchanger → working fluid → turbine
  • b) Warm surface seawater → low-pressure container → turbine/generator
  • c) Deep seawater → heat exchanger → working fluid → turbine
  • d) Deep seawater → low-pressure container → turbine/generator
Q.7
Why does an open-cycle OTEC use low-pressure container?
  • a) To solidify the warm surface seawater
  • b) To evaporate the deep seawater
  • c) To boil and evaporate the warm surface seawater
  • d) To solidify the warm surface seawater
Q.8
Which of the following produces desalinized fresh water?
  • a) Closed-cycle OTEC
  • b) Fracking
  • c) Ammonia
  • d) Open-cycle OTEC
Q.9
Why does open-cycle OTEC produce desalinized fresh water?
  • a) Because the vapourised surface seawater leaves all the salts and contaminants in the low-pressure container
  • b) Because of the working fluid
  • c) Because the warm surface seawater is mixed with deep ocean water
  • d) Because of thermohaline circulation
Q.10
Where is the desalinized fresh water used?
  • a) Sent back into ocean
  • b) Used for irrigation and aquaculture
  • c) Used to generate electricity
  • d) Used to generate tides
Q.11
Which of the following best describes hybrid ocean thermal energy conversion?
  • a) Warm surface seawater → low-pressure container → turbine/generator
  • b) Deep seawater → vacuum chamber → flash-evaporated → steam vapourises ammonia → turbine
  • c) Warm surface seawater → vacuum chamber → flash-evaporated → steam vapourises ammonia → turbine
  • d) Deep seawater → low-pressure container → turbine/generator
Q.12
How does hybrid OTEC provide desalinized water?
  • a) By evaporating the warm surface seawater
  • b) By solidifying the warm surface seawater
  • c) By condensing the steam generated from deep seawater
  • d) By condensing the steam generated from warm surface seawater
Q.13
Which of the following is a good choice for working fluid?
  • a) CFCs
  • b) Steam
  • c) Surface seawater
  • d) Deep seawater
Q.14
As the vapour pressure of working fluid increases the size of turbine ________
  • a) increases
  • b) decreases
  • c) does not change
  • d) first increases then decreases
Q.15
The wall thickness of pipes used to transport the vapour increases as the vapour pressure of working fluid increases.
  • a) True
  • b) False
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