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Energy Engineering Mcqs

Q:

What is ‘n’ in the following solar intensity formula?
I = Isc {1 + 0.033cos (360n/365)}

A) Day of the year B) Month of the year
C) The year D) Week of the year
 
Answer & Explanation Answer: A) Day of the year

Explanation: The following ‘n’ denotes day of the year in the formula. Since the distance between sun and earth varies, extra-terrestrial flux also varies. Earth is closest to the sun in the summer and farthest away in the winter.

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409
Q:

How pressure in the furnace is maintained below atmospheric pressure in balanced draught system?

A) By forced draught fan B) By induced fan
C) Depends on the height of chimney D) By installing Natural draught
 
Answer & Explanation Answer: B) By induced fan

Explanation: In balanced draught system, a forced draught fan is installed near the boiler which helps in overcoming the resistance of fuel bed by supplying sufficient air for combustion. An induced draught fan is installed near the chimney base removes the flue gases coming from the furnace and maintains pressure in the furnace slightly below the atmospheric pressure.

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301
Q:

What is the main source for the formation of wind?

A) Uneven land B) Sun
C) Vegetation D) Seasons
 
Answer & Explanation Answer: B) Sun

Explanation: Wind is free and renewable form of energy, which throughout history has been used to grind grain, power ships, and pump water. Wind is created when the sun unevenly heat the earth surface.

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266
Q:

The process of producing energy by utilizing heat trapped inside the earth surface is called _________

A) Hydrothermal energy B) Geo-Thermal energy
C) Solar energy D) Wave energy
 
Answer & Explanation Answer: B) Geo-Thermal energy

Explanation: The process of producing energy by utilizing heat trapped inside the earth surface is called Geo thermal energy. Energy present as heat in the earth’s crust. The more readily accessible heat in the upper most (10 km) or so, of the crust constitutes a potentially useful and almost inexhaustible source of energy.

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255
Q:

What is Baghouse?

A) Filters arranged in parallel form B) Filters arranged throughout the system
C) Filters arranged randomly D) Filters arranged alternatively
 
Answer & Explanation Answer: A) Filters arranged in parallel form

Explanation: A fabric filter element made up of a long hollow cylindrical tube, that provides a large surface per unit of gas volumetric flow rate is called as baghouse filter and a system consisting of large number of such filter elements arranged in parallel rows is called a baghouse.

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248
Q:

Presence of Corrosive gases like H2S and SO2 affect the voltage drop.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: Presence of Corrosive gases like H2S and SO2 does affect the voltage drop at brush contacts in generator leading to poor commutation. Silver contacts of relays get blackened and lead to high contact resistance and failure of relay occurs.

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241
Q:

What accounts for the presence of water in the exhaust leaving as vapor?

A) Gross calorific value B) Flash point value
C) Ignition temperature value D) Net calorific value
 
Answer & Explanation Answer: A) Gross calorific value

Explanation: Gross heating value accounts for water in the exhaust leaving as vapor, and includes liquid water in the fuel prior to combustion. This value is important for fuels like wood and coal, which will usually contain some amount of water prior to burning.

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223
Q:

Which fuel is partially carbonized and is considered as a primary stage in coal formation?

A) Coal bitumen B) Anthracite
C) Peat D) Lignite
 
Answer & Explanation Answer: C) Peat

Explanation: Peat is partially carbonized and decomposed material formed mainly due the transformation of buried vegetation. It is considered as the primary stage in the formation of the coal. It is spongy substance with high moisture content (upto 80%). Hence it has to be dried before use. In dry form, it has a calorific value of about 14560 KJ/kg. It consists of 58% C; 6.3% H?; 30.8% O?; 0.9% N? and 4% ash.

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