# Energy Engineering Questions and Answers – Hydrology – 1

This set of Energy Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Hydrology – 1”.

1. How does Hydro power plays important in development of a country?
a) Shows the amount of water power in a country
b) Providing abundant amount of power
c) Providing power at cheap rate
d) Power production by hydro power plant is easier

Explanation: In the development of a country the hydro power plays a very important role because it provides power at cheapest rates. No raw material is required for the production of power from hydro power plant.

2. How much of the total amount of power developed world wide consists of hydro power plant?
a) 10%
b) 20%
c) 30%
d) 40%

Explanation: Nearly 20% of the total world’s power is generated using hydro power plants. To countries in the world 90% of the nation’s power requirement is met by hydro power. When compared country wise this amount is very high.

3. Which two countries have vast hydro resources?
a) Hungary and Luxemburg
b) India and china
c) Russia and Nepal
d) Japan and Georgia

Explanation: Russia and Nepal have vast hydro resources that are to be harnessed. As per the estimation of world power organization, the world hydro potential is roughly 5000GW whereas only 4% of it (200GW) is presently developed.

4. What type of energy does rain falling holds relative to the oceans?
a) Potential energy
b) Kinematic energy
c) Electrical energy
d) Motion energy

Explanation: Rain falling on earth surface has potential energy relative to oceans towards which it flows. This energy can be converted into shaft work by hydraulic prime mover and finally into electrical energy. The conversion of this energy takes time.

5. The shaft power developed by the water passing through the prime mover is given by _______
a) P = $$\frac{mgH}{1000}$$ × no.
b) P = $$\frac{mgH}{10}$$ × no.
c) P = $$\frac{mgH}{100}$$ × no.
d) P = $$\frac{mgH}{n_{o^.}}$$ × 1000

Explanation:
Where, m = Rate of water flow in kg/sec.
H = Height of fall in meters.
no = overall efficiency.
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6. On what does generation of Hydro power depends?
a) Quantity of water available
b) On capacity of turbine
d) Storage capacity

Explanation: Generation of power depends on the quantity of water available. The available head depends upon the selection of site for hydraulic power plant. The site of the power plant is always selected for the highest available head when other things are in favor of site selection.

7. On what does the Quantity of water available at selected site depends?
a) Temperature at the selected site
b) Humidity at selected site
c) Vegetation of the area
d) Hydrological cycle of area

Explanation: The quantity of water available at the selected site depends upon the hydrological cycle of nature. The quantity of water available can be determined from the study of rainfall and run off in the area.

8. Capacity of hydraulic plant is dependent on __________
a) Minimum quantity of water available
b) Vegetation of the selected area
c) Maximum quantity of water available

Explanation: As the availability of water depends on natural phenomenon of rain, the maximum capacity of hydraulic generating plant is usually fixed on the basis of minimum quantity of water available at selected site.

9. What are used to store water during peak periods?
a) Storage drums
b) Canals
c) Sews
d) Storage Reservoirs

Explanation: The capacity of the hydraulic plant is done on the basis of minimum quantity available. Usually storage reservoirs are constructed for such plants in order to store the water during peak periods of runoff and supply the same during off peak periods of runoff.

10. The evaporation of water from the surfaces and its precipitation is known as ___________
a) Science
b) Infiltration
c) Hydrological cycle
d) Vegetation

Explanation: It’s the science which deals with rainfall and runoff. The evaporation of the water from the surfaces of river and oceans and its precipitation on the earth is known as hydrological cycle. This happens in a particular amount of period.

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