1. Higher fuel combustion efficiency cannot be achieved by
a) preheating of fuel gases & combustion air
b) supplying correct amount of combustion air
c) reducing sulphur content in the fuel
d) adopting proper fuel firing technique & fuel preparation
Answer
Answer: c [Reason:] Higher fuel combustion efficiency cannot be achieved by reducing the sulphur content in the fuel as sulphur content has nothing much to do with the combustion efficiency.
2. A particular coal is said to be free burning when it
a) gives smokeless burning
b) shows little or no fusing action
c) burns completely
d) none of the mentioned
Answer
Answer: b [Reason:] When a coal shows little or no fusing action, it is said to be free burning.
3. Bunsen burner is an example of a/an __________ burner.
a) inside mixing/premix type
b) submerged combustion
c) rotary cup
d) outside mixing/diffusion flame/nozzle mix type
Answer
Answer: a [Reason:] Bunsen burner is an example of a/an inside mixing/premix type burner.
4. The cooling medium used in dry quenching of coke is
a) nitrogen
b) air
c) phenolic water
d) carbon dioxide
Answer
Answer: a [Reason:] The cooling medium used in dry quenching of coke is nitrogen.
5. High amount of sulphur and phosphorous in coke causes
a) increase in its strength
b) decrease in its calorific value
c) brittleness of steel made by using it
d) none of the mentioned
Answer
Answer: c [Reason:] Steel is made brittle by the presence of high amount of sulphur and phosphorus in coke.
6. Cannel coal and boghead coal are the examples of
a) liptobiolites
b) humic coals
c) sapropelic coals
d) none of the mentioned
Answer
Answer: c [Reason:] Cannel coal and boghead coal are the examples of Sapropelic Coals. Sapropelic Coals are rich in microscopic organic matter derived from waxy or resinous plant parts and have high yields of volatile matter.
7. The difference between total carbon and fixed carbon of coal will be minimum in case of
a) anthracite
b) lignite
c) bituminous
d) high temperature coke (V.M < 0.5%)
Answer
Answer: d [Reason:] The difference between total carbon and fixed carbon of coal will be minimum in case of high temperature coke. The high temperature coke has low volatile matter that is the erason for the same.
8. Out of the following fuels, the difference between the net and gross calorific value is maximum in case of
a) fuel oil
b) blast furnace gas
c) bituminous coal
d) pitch
Answer
Answer: a [Reason:] The difference between the net and gross calorific value is maximum in case of
Fuel Oil.
9. Which of the following is the maximum coal producing state in India?
a) Orissa
b) West Bengal
c) Jharkhand
d) Assam
Answer
Answer: c [Reason:] Jamshedpur has the highest production of coal in India.
10. A good quality coal should have
a) low fusion point of ash
b) high sulphur
c) high ash content
d) none of the mentioned
Answer
Answer: d [Reason:] A good quality coal should have high concentration of carbon, low moisture content, etc.
11. __________ prohibits the use of alcohols directly in petrol engines.
a) High cost & difficult availability
b) Low octane number
c) Low flash point
d) Low calorific value
Answer
Answer: a [Reason:] High cost & difficult availability prohibits the use of alcohols directly in petrol engines.
12. The hottest part of the flame lies in its ____ zone.
a) non-luminous
b) luminous
c) yellow
d) unburnt gases
Answer
Answer: a [Reason:] The hottest part of the flame lies in its non-luminous zone.
13. Percentage of methane in coke oven gas may be around
a) 5
b) 15
c) 25
d) 35
Answer
Answer: c [Reason:] Percentage of methane in coke oven gas may be around 25%.
