Compared to a conventional steam plant, the temperature and pressure in a geothermal plant are
- A.Comparable
- B.Much higher
- C.Higher
- D.Lower
Correct answer
Explanation
The correct answer is D, lower. A geothermal plant takes steam or hot water from a natural underground reservoir, whose temperature is set by the rock and rarely approaches what a furnace can produce, so both the temperature and the pressure at the turbine are well below those of a coal-fired steam plant, and the thermal efficiency is correspondingly lower. Options B and C are wrong for the same reason: no natural reservoir is hotter than a boiler fired deliberately, and quoting higher values confuses the depth of the source with its temperature. Option A is wrong because the two are not comparable either; the gap is large enough that geothermal turbines are designed differently, often working on a separate fluid that boils at a low temperature. What geothermal loses in efficiency it gains in fuel cost, which is nil, and in emissions.
Read the full article: Renewable Energy in India: Sources, Missions and PYQs
Practice Questions
View allWhich of the following types of coal has the most carbon content?
- A.Bituminous
- B.Lignite
- C.Peat
- D.Anthracite
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Anthracite is the oldest and hardest grade of coal, with the highest proportion of carbon, so it gives the most heat for its weight and burns with a clean, almost smokeless flame.
Read the full explanation →The headquarters of the International Solar Alliance is located at
- A.New Delhi
- B.Gurugram, Haryana
- C.Bengaluru, Karnataka
- D.Paris, France
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The alliance has its secretariat on the campus of the National Institute of Solar Energy at Gwal Pahari in Gurugram, and because it rests on a framework agreement among its members it is the first treaty-based international organisation to be headquartered in India.
Read the full explanation →The Jawaharlal Nehru National Solar Mission was launched in which year?
- A.2006
- B.2008
- C.2010
- D.2015
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The mission was launched in January 2010 as one of the eight national missions under the National Action Plan on Climate Change, and its aim was to make solar power competitive by building capacity in stages and by supporting domestic manufacturing.
Read the full explanation →Which of the following is NOT a renewable source of energy?
- A.Tidal energy
- B.Natural gas
- C.Biomass
- D.Geothermal energy
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Natural gas is a fossil fuel formed over millions of years from buried organic matter; the stock is fixed, so every unit burnt is gone, and it releases carbon dioxide when burnt, although less than coal for the same heat.
Read the full explanation →The Muppandal wind farm, one of the best known in India, is located in which state?
- A.Gujarat
- B.Rajasthan
- C.Tamil Nadu
- D.Maharashtra
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Muppandal lies in the far south of the state near Kanyakumari, where the wind pushed through a break in the Western Ghats blows strongly and steadily for much of the year, and Tamil Nadu has long been among the leading wind states of the country.
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