Fuels and Combustion

11._________ of the coal is the basis for Seylor's coal classification.

  1. Proximate analysis
  2. Ultimate analysis
  3. Caking index
  4. Calorific value

Correct answer: (B)
Ultimate analysis

12._________ present in coal is not determined in its ultimate analysis.

  1. Fixed carbon
  2. Total carbon
  3. Hydrogen
  4. Nitrogen

Correct answer: (A)
Fixed carbon

13._________ process is meant for direct hydrogenation of coal to produce liquid fuel.

  1. Fischer-Tropsch
  2. Bergius
  3. Lurgi
  4. None of these

Correct answer: (B)
Bergius

14._________ prohibits the use of alcohols directly in petrol engines.

  1. Low octane number
  2. High cost & availability
  3. Low flash point
  4. Low calorific value

Correct answer: (B)
High cost & availability

15.(64-132) rank coal (ASTM) means a coal with 64%

  1. Fixed carbon and having a heat value of 13, 200 BTU/1b
  2. Ash and a heating value of 13, 200 BTU/1b
  3. Fixed carbon and a heating value of 132 BTU/1b
  4. None of these

Correct answer: (A)
Fixed carbon and having a heat value of 13, 200 BTU/1b

16.A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that

  1. 21% excess air has been used for combustion
  2. 21% excess oxygen has been used for combustion
  3. Complete combustion of fuel has taken place
  4. No excess air has been used for combustion

Correct answer: (C)
Complete combustion of fuel has taken place

17.A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of _________ cms.

  1. 1 to 2
  2. 3 to 4
  3. 5 to 15
  4. 20 to 40

Correct answer: (C)
5 to 15

18.A coal containing high amount of volatile matter will have

  1. Low ignition temperature
  2. Very little ash content
  3. High fusion point of its ash
  4. Low adiabatic flame temperature

Correct answer: (A)
Low ignition temperature

19.A coal containing very high percentage of durain is called _________ coal.

  1. Bright
  2. Splint
  3. Non-banded
  4. Boghead

Correct answer: (B)
Splint

20.A coal gasifier operating at 20 atm. (e.g. Lurgi gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

  1. Higher methane content and thus higher calorific value
  2. Higher carbon monoxide content
  3. Lower carbon dioxide content
  4. None of these

Correct answer: (A)
Higher methane content and thus higher calorific value

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