# Energy Engineering Questions and Answers – Tidal Power

This set of Energy Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Tidal Power”.

1. How many basins does a single pool tidal system have?
a) 1
b) 2
c) 3
d) 4

Explanation: The simple single pool tidal system has one pool or basin behind a dam that is filled from the ocean at high tide and emptied to it at low tide. Both filling and emptying processes take place during short periods of time.

2. How much energy is estimated as total tidal power that is generated throughout the world?
a) 2.4 X 106 MW
b) 8.3 X 106 MW
c) 4.9 X 106 MW
d) 12 X 106 MW

Explanation: The total tidal power that is dissipated throughout the world is estimated at 2.4 X 106 MW of these some 106 MW are dissipated in shallow seas and coastal areas and are not recoverable. Because of very high cost of dams and other structures associated with tide energy conversion system, only a small amount of the rest can be satisfied by tidal energy.

3. What is time period for one tide to occur in a day?
a) 6h, 12.5 min
b) 6h, 40.5 min
c) 6h, 0 min
d) 6h, 25.6 min

Explanation: The flow of water in both directions is used to drive a number of reversible water turbines, each driving an electrical generator. Electric power would thus be generated during two short periods each tidal period of 12h, 25min or once every 6h, 12.5 min.

4. How many high peaks occur in a single pool tidal system?
a) 1
b) 2
c) 3
d) 4

Explanation: In the simple single pool system two high peaks, short duration power outputs occur every tidal period. Such peaks require large turbine-generators that remain idle much of the time. The power peaks also occur at different times every day (50 min later each successive day), at times of high and low tides.

5. What happens if the turbine generators are smaller and operate much longer?
a) Resulting work is reduced
b) High power generation
c) Less power loss
d) Less sound is created

Explanation: Because the average head h is lower and work and power are proportional to h2, turbine generators are much smaller and operate over a much longer period. The resulting total work is reduced.
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6. On what is two-pool tidal system is less dependent?
a) Barrage
b) Tidal fluctuation
c) Reservoir
d) Gravitational force

Explanation: The two pool tidal system is less dependent on tidal fluctuation but is more complex and involves more costly dam construction. An inland basin is enclosed by dam A and is divided into a high pool and a low pool by dam B.

7. How much must be the tidal range over barrage to be feasible?
a) 7 meters
b) 25 meters
c) 10 meters
d) 20 meters

Explanation: The tidal range must be at least 7 meters (23 feet) for a barrage to be feasible. There are only three commercial-size barrage systems operating: one in France (240 MW), one in Nova Scotia (20MW), and one in Russia (500 kW).

8. Any location where the fresh water meets salty water is called _________
a) Dredging
b) River
c) Delta
d) Estuary

Explanation: Any location where fresh river water meets salty ocean water. The word “estuary” is derived from the Latin word aestuarium meaning tidal inlet of the sea, which in itself is derived from the term aestus, meaning tide. Estuaries are critical habitat for spawning and early life cycle stages of many ocean organisms as well as birds.

9. What tide of tide is it called when two high tides and two low tides of approximately equal size occur?
a) Diurnal tide
b) Spring tide
c) Neap tide
d) Semi-Diurnal tide

Explanation: An area has a semidiurnal tidal cycle if it experiences two high and two low tides of approximately equal size every lunar day. Semidiurnal tides may have daily inequity, where successive high tides have different heights.

10. Difference between water height at high tide and water height at low tide is called _______
a) Tidal Variation
b) Tidal volume
c) Tidal Range
d) Tidal Current

Explanation: The tidal range is the vertical difference between the high tide and the succeeding low tide. Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth.

11. What is the movement of water generated by or associated with the change in mean sea level called?
a) Tidal Variation
b) Tidal volume
c) Tidal Range
d) Tidal Current

Explanation: Movement of water generated by or associated with the change in mean sea level is called tidal currents. Tidal currents occur in conjunction with the rise and fall of the tide. The vertical motion of the tides near the shore causes the water to move horizontally, creating currents.

12. What is the movement of water away from the shore called?
a) Flood tide
b) Spring tide
c) Ebb tide
d) Neap tide

Explanation: Movement of water away from the shore is called ebb tide. Ebb tide means the period between high tide and low tide during which water flows away from the shore, the receding or outgoing tide. The period between high water and the succeeding low water.

13. What is the term used for transport of non-cohesive sediments?
a) Dirt drop
b) Flick
c) Littoral drift
d) Droplet drifts

Explanation: Littoral transport is the term used for the transport of non-cohesive sediments, i.e. mainly sand, along the foreshore and the shore face due to the action of the breaking waves and the long shore currents.

14. Name the process of excavation activity usually carried underwater of purpose of gathering up bottom sediments.
a) Police drag
b) Dredging
c) Auger suction
d) Anti-eutrophication

Explanation: Dredging is an excavation activity usually carried out underwater, in shallow seas or freshwater areas with the purpose of gathering up bottom sediments and widening. This technique is often used to keep waterways navigable and creates an anti sludge pathway.

15. One Terra-watt is equal ______________
a) 1 trillion-watts
b) 100 trillion-watts
c) 5 trillion-watts
d) 10 trillion-watts

Explanation: One terra-watt is equal to 1 trillion watts. One terawatt hour of energy is equal to a sustained power delivery of approximately 114 megawatts for a period of one year. The watt second is a unit of energy, equal to the joule. One kilowatt hour is 3,600,000 watt seconds.

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