Q1. Which is not correct statement about effect of sulphur in fuel
(A) it has heating value
(B) it helps in electrostatic precipitation of ash in flue-gases
(C) it leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
(D) it erodes furnace walls

Q2. Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of
(A) higher effectiveness of boiler
(B) high calorific value coal being burnt
(C) fouling of heat transfer surfaces
(D) raising of steam temperature

Q3. Incomplete combustion can be best judged by
(A) smoky chimney exit
(B) excess air in flue gases
(C) measuring carbon mono-oxide in flue gases
(D) measuring temperature of flue gases at exit of furnace

Q4. The capacity of induced draft fan compared to forced draft fan in a boiler is
(A) same
(B) more
(C) less
(D) less or more depending on size of boiler

Q5. Pulverised fuel is used for
(A) better burning
(B) more calorific value
(C) less radiation loss
(D) medium sized units

Q6. Calorific value of coal is of the order of
(A) 250-400 kcal/kg
(B) 850-1200 kcal/kg
(C) 2000-4000 kcal/kg
(D) 5050-8050 kcal/kg

Q7. Evaporative capacity of boiler is expressed as
(A) kg of steam produced
(B) steam pressure produced
(C) kg of fuel fired
(D) kg of steam produced per kg of fuel fifed

Q8. Boiler parameters are expressed by
(A) tonnes/hr. of steam
(B) pressure of steam in kg/cm2
(C) temperature of steam in °C
(D) all of the above

Q9. The condition of steam in boiler drum is always
(A) dry
(B) wet
(C) saturated
(D) supersaturated

Q10. The balanced draft furnace is one using
(A) induced draft fan and chimney
(B) induced draft fan and forced draft fan
(C) forced draft fan and chimney
(D) any one of the above

Q11. Maximum energy loss in a boiler occurs due to
(A) incomplete combustion
(B) ash content
(C) flue gases
(D) radiation losses

Q12. Over fire burning is the phenomenon of
(A) supply of excess, air
(B) supply of excess coal
(C) burning CO and unburnts in upper zone of furnace by supplying more air
(D) fuel bed firing

Q13. Which is not the correct statement about moisture in coal
(A) inherent moisture and surface mois¬ture are different things
(B) in some coals moisture may be present upto 40%
(C) some moisture in coal helps in better burning which is not possible with completely dry coal
(D) it increases thermal efficiency

Q14. Deaeration of feed water is carried out because it reduces
(A) cavitation of .boiler feed pumps
(B) corrosion caused by oxygen
(C) heat transfer coefficient
(D) pH value of water

Q15. Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler
(A) increases
(B) decreases
(C) first increases and then decreases
(D) first decreases and then increases

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