What is the correct answer?


The excess air required for the combustion of pulverised coal is of the order of about __________ percent.

A. 5

B. 15

C. 30

D. 45

Correct Answer :

B. 15

Related Questions

Out of the following, the most malleable material is The 'transition temperature' for ductile to brittle behaviour of steel… Corona discharge is related to the operation of a/an __________ stress cannot be sustained by a fluid in equilibrium. __________ is the hardest material out of the following. __________ test determines the yield strength, Young's modulus of elasticity,… The transition temperature at which all the ferromagnetic materials become… The emf of a Deniell cell Zn | Zn2+ || Cu2+ | Cu can be increased by Carbide tipped cutting tools are manufactured by powder metallurgy techniques… Biological shield in a nuclear reactor is generally provided to protect… Insulation of liquid surface can be achieved by __________ on top of its… Which of the following metals is not subjected to electrolytic refining/purification? In a totally irreversible isothermal expansion process for an ideal gas,… In fluid flow, and heat and mass transfer, one encounters (i) kinematic… __________ is not a heat treatment process. Steels with high carbon equivalent have poor Weldability, because in these… Which of the following is the most suitable material of construction for… Material of construction of the electrode used in the electric resistance… Which of the following if present in iron ore, enhances its value? Other parameters remaining same, the recrystallisation temperature of… Young's modulus of a material is the measure of its While the oxy-acetylene flame produces a temperature of 3200°C, the… __________ pipe is the most suitable for carrying sanitary drainage. Fine grained steels have Pick out the wrong statement. Fire in fuel gas pipelines is extinguished most effectively by Glycerine is used as a coolant in cooling of some engines instead of water,… Fire refining process is employed in case of Blow off cock is provided in steam boiler to Dry saturated steam can be converted into superheated steam by