1. (2ptsx 15-30pts) Multiple Choice: Choose the best answer a) A power of 100 kW
ID: 2293770 • Letter: 1
Question
1. (2ptsx 15-30pts) Multiple Choice: Choose the best answer a) A power of 100 kW for 90 seconds is equal to which option? A. 2151 Kilocalorie B. 853 Btu C. 25 kWh D. None of the above b) The major gas responsible for greenhouse effect is A. Water vapor B. Carbon dioxide C. Methane D. Ozone than cold air c) At a constant pressure, hot air A. is less dense B. is more dense C. has more vapor D. has less vapor d) Which of the followings is an example of active solar heating? A. Using rooftop solar panels B. With a greenhouse or conservatory C. By absorbing sunlight through windows e Which photons of solar radiation have the least energy? A. Infra-red radiation B. Green light C. Ultraviolet light D. There is no difference of the above f) A. B. C. D. Generally, the most economically viable application of solar energy heating technology is: Service water heating Hot-air space heating Hot-water space heating Emergency heating g) Horizontal axis and vertical axis are the types ofExplanation / Answer
1) joules (J) = P*sec
100K*90= 9MJ
but 1 joule= 0.000239006 Kcal
so 9MJ= 2151 kCal (option A)
2) Major Gas responsible for Gree House effect is Carbon dioxide(opiton B).
3) at a constant pressure, hot air is Less Dense than cold air.
4) example of active solar heating is USING ROOFTOP SOLAR PANELS.
5) red light has least energy in solar radiations. so Infra red radiation photons has least energy
6) Most economical viable application of solar energy heating tecchnology is HOT WATER SPACE HEATING
7) horizontal axis and vertical axis are the types of Wind mills.
8) which of these is not a part of a modern wind turbine Compressor.
9) as an ocean wave approaches the shore, the top curls over and crashes in sand. These waver are called Breakers wave.
10) The term biomass most often refers to organic matter.
11) BIO Methane is called bio gas.
12) heat from the earth is obtained from all except Gathering lava from volcanoes to boil water. ( Option A).
13) heat exchangers transfers heat from hot water to a liquid with a lower boiling point to create system (option A).
14) Kienetic energy is stored in Flywheel. (option A)
15). the capacity of lead acid cell does not depend on Rate of discharge.
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