Section A$-$ Multiple Choice $(2$ marks each$)$

$1.)$ Which of these statements is correct?

a$.)$ Higher excess air levels do not lead to an increase in stack losses.

b$.)$ Radiation and convection losses turn into a larger $\backslash (\backslash \%\backslash )$ loss with increase in firing rate.

c$.)$ Multiple pass boilers result in increased efficiency.

d$.)$ All of the above.

$2.)$ One of the conditions mentioned below does not lead to low water. Identify the same.

a$.)$ Failure of feed control system

b$.)$ Loss in feed pressure

c$.)$ Ruptured tubes

d$.)$ Steam$/$water leaks in pressure section.

$3.)$ Economizers preheat

a$.)$ Combustion air.

b$.)$ Feedwater.

c$.)$ Condensate.

d$.)$ Fuel oil.

$4.)$ Feedwater is treated to

a$.)$ Decrease need for make$-$up$.$

b$.)$ Increase circulation.

c$.)$ Decrease dissolved solids.

d$.)$ Prevent formation of scale.

$5.)$ Deaerating is

a$.)$ Adding oxygen to the boiler feedwater.

b$.)$ Extracting steam from a turbine.

c$.)$ Removing non$-$condensable gases from the feedwater.

d$.)$ Adding heat to feedwater.