Which of the following accounts for maximum energy loss in a boiler ?

Related Mcqs:

1. A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the ‘carpet loss’. The carpet loss may be of the order of ______________ cms?

   A. 1 to 2
   B. 3 to 4
   C. 5 to 15
   D. 20 to 40

2. Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the___________________?

   A. Requirement of large volume combustion chamber
   B. Risk of explosion
   C. Chances of clinker formation
   D. Incomplete combustion of coal

3. Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?

   A. Multicyclones
   B. Bag filter
   C. Wet scrubber
   D. Hydrocyclones

4. Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?

   A. Ash disposal problem
   B. Excessive fly-ash discharge from the stack
   C. High power consumption in its transportation
   D. Erosion of induced draft fan blades

5. Which of the following fuels is generally not used in thermal power plant boiler firing ?

   A. Furnace oil, light diesel oil and tar/PCM
   B. Pulverised coking coal
   C. Coal middling from washeries
   D. B.F. gas, coke oven gas and L.D. converter gas

6. In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of__________________?

   A. Transportation of coal
   B. Drying of coal
   C. Combustion of coal by supplying it around the burner
   D. Preheating the primary air

7. Coal is pulverised before burning in large capacity boiler furnaces mainly to____________________

   A. Ensure its complete combustion
   B. Facilitate easy ash removal
   C. Enhance its calorific value
   D. Provide trouble free operation

8. Use of pulverised coal in boiler furnace provides___________________?

   A. High calorific value
   B. Better combustion
   C. Smokeless burning
   D. Less erosion on furnace walls

9. Pulverised coal used in boiler firing need not have____________________?

   A. Less moisture content
   B. High fusion point of its ash
   C. High bulk density
   D. Lower ash content

10. White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_______?

    A. Tar
    B. Sulphide Coke
    C. Coke Oven Gas
    D. Pulverised coke

    Submitted by: Muhammad Mutsadiq Umer