Power Plant Questions and Answers – Coal Firing Systems – I

This set of Power Plant Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Coal Firing Systems – I”.

1. __________ of the coal is the basis for Seylor’s coal classification.
a) Proximate analysis
b) Calorific value
c) Ultimate analysis
d) Caking index
View Answer

Answer: c
Explanation: Ultimate Analysis of the coal is the basis for Seylor’s coal classification.

2. Yield of pitch from distillation of high temperature tar is around __________ percent.
a) 10
b) 25
c) 65
d) 100
View Answer

Answer: c
Explanation: Yield of pitch from distillation of high temperature tar is around 65 percent.

3. Caking index of the coal blend used for the manufacture of metallurgical coke should be around __________
a) 5
b) 40
c) 21
d) 48
View Answer

Answer: c
Explanation: Caking index is the ability of coal to be formed into cakes. Caking index of the coal blend used for the manufacture of metallurgical coke should be around 21.
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4. High excess air in combustion of fuels results in __________
a) smoky flame
b) increased fuel consumption
c) incomplete combustion
d) none of the mentioned
View Answer

Answer: b
Explanation: High excess air in combustion of fuels results in increased fuel consumption. More the quantity of air in the fuel, more lean a mixture becomes.

5. The heat of combustion of a fuel __________
a) is equal to the heat of formation
b) is always negative
c) can’t be known without calculating it
d) is always positive
View Answer

Answer: b
Explanation: The heat of combustion of a fuel is always negative as always some heat has to be given (supplied) to the fuel for burning it.
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6. _________ has the widest inflammability limit (explosion limit) of all the gases.
a) Carbon monoxide
b) Methane
c) Hydrogen
d) Acetylene
View Answer

Answer: d
Explanation: Acetylene has the widest inflammability limit (explosion limit) of all the gases. That is another factor due to which the gas is used in Gas welding.

7. What are the main constituents of benzol?
a) benzene, toluene & xylene
b) tar & creosote
c) ammonia & phenol
d) anthracene & phenol
View Answer

Answer: a
Explanation: Benzol comprises of benzene, toluene and xylene.
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8. With increase in moisture content of coal, its __________
a) calorific value increases sometimes
b) bulk density always decreases
c) clinkering tendency during combustion increases
d) none of the mentioned
View Answer

Answer: d
Explanation: None of the mentioned factors behave in the manner when the moisture content increases.

9. Oxygen percentage (by weight) in atmospheric air is?
a) 22
b) 20
c) 19
d) 21
View Answer

Answer: d
Explanation: 21 % of the atmospheric air is Oxygen.
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10. In flue gas analysis by Orsat’s apparatus, carbon dioxide is absorbed by __________
a) cuporus chloride
b) dilute potassium carbonate
c) potassium hydroxide
d) alkaline pyragllol solution
View Answer

Answer: c
Explanation: In flue gas analysis by Orsat’s apparatus, carbon dioxide is absorbed by potassium hydroxide.

Sanfoundry Global Education & Learning Series – Power Plant Engineering.

To practice all areas of Power Plant Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
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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