Questions and answers for exam Preparation

MCQs

Total Questions : 2441 | Page 242 of 245 pages

Question 2411. A coal containing very high percentage of durain is called ______________ coal?

Bright
Splint
Non-banded
Boghead

Discuss Question

Answer: Option B. -> Splint
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2412. Anthracite coal ____________________?

Contains more volatile matter than bituminous coal
Ignites more easily than bituminous coal
Is essentially a coking coal
Burns with short, bluish, yellow-tipped flame producing very little smoke

Discuss Question

Answer: Option D. -> Burns with short, bluish, yellow-tipped flame producing very little smoke
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2413. Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called_________________?

Back draughting
Banking
Under pressurising
None of these

Discuss Question

Answer: Option B. -> Banking
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2414. Stack heat losses can be minimised by________________?

Controlling the excess air
Oxygen enrichment of combustion air
Using low c.v. fuels
Maintaining proper draft in the furnace

Discuss Question

Answer: Option A. -> Controlling the excess air
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2415. Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about________________?

8800 kcal/m3
8800 kcal/kg
Same as that of coal middling
25000 kcal/kg

Discuss Question

Answer: Option B. -> 8800 kcal/kg
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2416. Calorific values of both the solid as well as the liquid fuels can be determined by ______________ calorimeter?

Bomb
Boy’s
Junkers
None of these

Discuss Question

Answer: Option A. -> Bomb
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2417. Calorific value of bituminous coal may be around ______________ Kcal/kg?

500
1500
6500
20000

Discuss Question

Answer: Option C. -> 6500
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2418. Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?

The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
It reduces its calorific value tremendously
It reduces its flame temperature tremendously
There are chances of explosion during preheating

Discuss Question

Answer: Option A. -> The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2419. Yield of coke oven gas in low temperature carbonisation of coal is about ______________ Nm3 /ton of dry coal?

Discuss Question

Answer: Option B. -> 160
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2420. Blast furnace gas burns with a bluish flame, because of the presence of____________________?

Discuss Question

Answer: Option A. -> CO
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!