Fuels Combustion Rate & Ratio MCQ with Answers - Set 29 - ObjectiveBooks

Fuels Combustion Rate & Ratio MCQ with Answers - Set 29

Practice Test: Question Set - 29

1. Which of the following is used for making the explosive ‘TNT’?
    (A) Benzol
    (B) Toluene
    (C) Pyridine
    (D) Cerosote

2. Narrow coke ovens as compared to wider coke ovens
    (A) Produce smaller coke
    (B) Produce stronger coke
    (C) Require less time of carbonization
    (D) All (a), (b) and (c)

3. Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.
    (A) CO content
    (B) Dew point
    (C) CO2 content
    (D) O2 content

4. Coal containing large quantity of __________ are difficult to wash.
    (A) Ash
    (B) Inherent mineral matter
    (C) Free impurities
    (D) Volatile matter

5. Producer gas containing least amount of tar is produced by the
    (A) Partial combustion of coal
    (B) Partial combustion of large size (< 50 mm) coke
    (C) High pressure gasification of coal (e.g. in Lurgi gasifier)
    (D) Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)

6. The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
    (A) 100 to 150
    (B) 350 to 450
    (C) 550 to 650
    (D) 700 to 850

7. Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about __________ °C.
    (A) 30
    (B) 65
    (C) 120
    (D) 180

8. Preheating of combustion air is done to
    (A) Increase the adiabatic flame temperature
    (B) Increase the calorific value of the fuel
    (C) Complete the combustion of fuel
    (D) Reduce its requirement for effecting the complete combustion

9. The function of secondary combustion air is to
    (A) Pneumatically convey the pulverized coal
    (B) Completely burn the volatile matter
    (C) Burn the lumpy coal
    (D) None of these

10. 'Mixed gas' used in steel plants is a mixture of
    (A) B.F. gas and coke oven gas
    (B) Coke oven gas and converter gas
    (C) Coke oven gas and L.P.G
    (D) Blast furnace gas and naphtha vapor

11. A coal containing very high percentage of durain is called __________ coal.
    (A) Bright
    (B) Splint
    (C) Non-banded
    (D) Boghead

12. Light oil whose major component is Benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.
    (A) 80-170
    (B) 200-300
    (C) 250-270
    (D) 280-300

13. By-products are __________ recovered in 'Beehive ovens'.
    (A) Fully
    (B) Partially
    (C) Not at all
    (D) Negligibly

14. Which of the following can be made into briquettes without the use of a binder?
    (A) Lignite
    (B) Bituminous coal
    (C) Anthracite coal
    (D) None of these

15. Anthracite coal
    (A) Contains more volatile matter than bituminous coal
    (B) Ignites more easily than bituminous coal
    (C) Is essentially a coking coal
    (D) Burns with short, bluish, yellow-tipped flame producing very little smoke

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