Questions and answers for exam Preparation

MCQs

Total Questions : 1935 | Page 188 of 194 pages

Question 1871. For combustion of a fuel, following is essential_____________________?

correct fuel air ratio
proper ignition temperature
02 to support combustion
all the three above
none of the above

Discuss Question

Answer: Option D. -> all the three above
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1872. Secondary air is the used to_________________?

provide air around burners for obtaining optimum combustion
transport and dry the coal
convert CO (formed in lower zone of furnace) into C02 at higher zone
air delivered by induced draft fan
air fed to pulverisers

Discuss Question

Answer: Option A. -> provide air around burners for obtaining optimum combustion
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1873. Caking coals are those which __________________________?

form lumps or masses of coke
burn freely
show little or no fusing action
burn completely
do not form ash

Discuss Question

Answer: Option A. -> form lumps or masses of coke
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1874. Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value ___________________?

(1- moisture content)
(1 + moisture content)
1 + moisture content
1 – moisture content

Discuss Question

Answer: Option A. -> (1- moisture content)
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1875. Incomplete combustion can be best judged by__________________?

smoky chimney exit
excess air in flue gases
measuring carbon mono-oxide in flue gases
measuring temperature of flue gases at exit of furnace
measuring oxygen in flue gases

Discuss Question

Answer: Option C. -> measuring carbon mono-oxide in flue gases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1876. Tertiary air is the air used to____________________?

provide air around burners for obtaining optimum combustion
transport and dry the coal
cool the scanners
supply air for ignitors
convert CO (formed in lower zone of furnace) into C02 at higher zone

Discuss Question

Answer: Option E. -> convert CO (formed in lower zone of furnace) into C02 at higher zone
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1877. The ultimate analysis of fuel lists _____________________?

various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume
various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
moisture and ash free heating value

Discuss Question

Answer: Option B. -> various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1878. Pulverized fuel is used for___________________?