Questions and answers for exam Preparation

MCQs

Total Questions : 2441 | Page 243 of 245 pages

Question 2421. Orsat apparatus is meant for ___________________?

Gravimetric analysis of flue gas
Finding out combustion efficiency
Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride
None of these

Discuss Question

Answer: Option D. -> None of these
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2422. The combustion reaction, C + O2 = CO2, is ___________________?

Exothermic
Endothermic
Autocatalytic
None of these

Discuss Question

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

Question 2423. Which of the following constituents of coal is the most important in the production of coke ?

Moisture
Ash
Volatiles
Carbon

Discuss Question

Answer: Option D. -> Carbon
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2424. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?

71%
In between 37 & 71%
None of these

Discuss Question

Answer: Option B. -> In between 37 & 71%
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2425. Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the ________________ of coal?

Hydrogenation
Gasification
Carbonisation
None of these

Discuss Question

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

Question 2426. Gross and net calorific value of a fuel will be the same__________________?

If its ash content is zero
If its carbon content is very low
If its hydrogen/hydrogen compound content is zero
Under no circumstances

Discuss Question

Answer: Option C. -> If its hydrogen/hydrogen compound content is zero
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2427. Coal is heated in presence of air to a temperature of about _______________ °C, while determining its ash content for proximate analysis?

500
750
950
1100

Discuss Question

Answer: Option B. -> 750
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2428. Quantity of coke produced from metallurgical coal may be around _____________ percent?

Discuss Question

Answer: Option C. -> 75
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2429. Fussain _____________________?

Is friable, charcoal like substance
Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation
All A., B. and C.

Discuss Question

Answer: Option D. -> All A., B. and C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2430. The liquid used for the washing of coal in an industrial coal washery is a mixture of water and ____________________?