A. form lumps or masses of coke
B. burn freely
C. show little or no fusing action
D. burn completely
E. do not form ash
Related Mcqs:
- Which of the following varieties of coals is mostly used in steam boilers____________________?
A. non-coking bituminous coal
B. brown coal
C. peat
D. coking bituminous coal
E. none of the above - Which of the following coals has the highest calorific value_________________?
A. anthracite coal
B. bituminous coal
C. lignite
D. peat
E. wood - The bituminous coal is non-caking if its carbon content is_______________?
A. 78-81%
B. 81-85%
C. 85-90%
D. 90-95%
E. 95-100%. - Superheating of steam is done at_________________?
A. constant volume
B. constant temperature
C. constant pressure
D. constant entropy
E. constant enthaply - Heating wet steam at constant temperature is heating it at constant_________________?
A. volume
B. pressure
C. entropy
D. enthalpy
E. none of the above - Hard coke is produced by carborisation of coal at_______________?
A. atmospheric temperature
B. 500-600°C
C. 70O-850°C
D. 95O-1100°C
E. 120O-1500°C - In a throttling process________________?
A. steam temperature remaisn constant
B. steam pressure remains constant
C. steam enthalpy remains constant
D. steam entropy remains constant
E. steam volume remains constant - The safety valve at superheater as compared to drum safety valve setting is set at___________________?
A. higher value
B. lower value
C. same value
D. any value
E. none of the above - The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?
A. increases
B. decreases
C. remains unchanged
D. increases/decreases depending on steam temperature requirements
E. unpredictable - The function of injector used in small capacity boilers is to____________________?
A. create vacuum
B. inject chemical solution in feed pump
C. pump water, similar to boiler feed pump
D. add make up water in the system
E. none of the above
