Energy Engineering Questions and Answers – Hydrology – 2


This set of Energy Engineering online quiz focuses on “Hydrology – 2”.

1. On what aspect is precipitation calculated?
a) Based on hydrological aspect
b) Based on climatic conditions
c) Based on the vegetation of the area
d) Based on weather forecast
View Answer

Answer: a
Explanation: The evaporation of the water from the surfaces of river and oceans and its precipitation on the earth is known as hydrological cycle. Based on hydrological aspect the distribution of precipitation on the earth surface and beneath the earth is calculated.

2. Water evaporated is carried with the air in form of vapor known as _______
a) Cloud
b) Drizzle
c) Fog
d) Smoke
View Answer

Answer: a
Explanation: It is the science which deals with rainfall. Water is evaporated from plants, rivers, oceans and carried with the air in the form of vapor which is known as cloud. Clouds vary in different shape and size and they move according to winds.

3. When does vapor turn into form of water or snow?
a) Cooled below Dew point
b) At Frost point
c) When cooled Freezing point
d) When there is rise in Humidity
View Answer

Answer: a
Explanation: Water is evaporated from surface of earth and stored in form of clouds. When the vapors in the atmosphere are cooled below dew point temperature, it falls in the form of water or snow depending on the atmospheric temperature.
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4. What source of energy does evaporation and precipitation consists of?
a) Perennial energy
b) Gravitational energy
c) Thermal energy
d) Kinetic energy
View Answer

Answer: a
Explanation: This evaporation and precipitation is a natural continuous process and therefore constitutes a perennial source of energy. Both these evaporation and precipitation come under the hydrological cycle.

5. Water on the ground surface entering the soil is called _________
a) Infiltration
b) Transpiration
c) Filtration
d) Precipitation
View Answer

Answer: a
Explanation: Infiltration is the process by which water on the ground surface enters the soil. Infiltration rate in soil science is a measure of the rate at which soil is able to absorb rainfall. It is measured in inches per hour or millimeters per hour.

6. The energy input to the hydrological cycle is by ____________
a) Wind
b) Water
c) Sun
d) Head
View Answer

Answer: c
Explanation: The energy input to hydrological cycle is sun. Due to sun, water evaporates from water bodies. On cooling, the vapors form cloud which falls down in the form of rain, snow, hail etc which is known as precipitation.

7. About how much amount of precipitate is returned back to atmosphere?
a) 2/3
b) 1/4
c) 3/4
d) 1/3
View Answer

Answer: a
Explanation: Precipitation includes all water that falls from the atmosphere to earth’s surface in any form. About 2/3 portion of precipitation that reaches land surface is returned back to atmosphere by water surfaces, soil and vegetation.

8. Amount of rainfall which runs off the earth’s land surface to form stream is used for ______
a) Flower generation
b) Back water storage
c) Pit Irrigation
d) Left through canals
View Answer

Answer: a
Explanation: About 2/3 portion of rain is returned back to atmosphere and 1/3 portion is returned back by oceans. The amount of rainfall which runs off the earth’s land surface to form streams and rivers is used for flower generation.

9. What is the unit of runoff ________
a) Day-sec meter
b) M2/s
c) MM/S2
d) Ns/m2
View Answer

Answer: a
Explanation: The unit of runoff is m3/s or Day-second meter.
1 Day second meter = Discharge collected in catchment area at the rate of 1 m3/s or for one day => 1 x 24 x 3600 = 86400 M3/s
And Total run off is given by:
Total Run-off = Direct runoff over the land surface + Run-off through seepage.

10. Where is the catchment area situated with respect to dam?
a) Behind the dam
b) Front of dam
c) Right beneath the dam
d) Opposite to the Dam Head
View Answer

Answer: a
Explanation: Catchment area of a hydro site is the total area located behind the dam, Draining water into the reservoir. The place is usually steep at this point. And the Dam head acts as outlet point to let out the water after utilizing it for power production.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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