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MCQs 1: A supercritical boiler is one that operates above the pressure and temperature of following values_____________________?

100 kg/cm2 and 540°C 1 kg/cm2 and 100°C 218 kg/cm2 abs and 373°C 218 kg/cm2 abs and 540°C 100 kg/cm2 abs and 373°C
Answer Explanation

MCQs 2: The steam temperature with increase in load in case of a boiler fitted with radiation super heater________________?

increases decreases remains unaffected first increases and then decreases unpredictable
Answer Explanation

MCQs 3: The relative heat absorption for successively added equal areas of boiler convection heating surfaces____________________?

increases decreases remains unaffected first increases and then decreases first decreases and then increases
Answer Explanation

MCQs 4: Fire tube boilers are limited to a maximum design working pressure of ____________________?

1 kg/cm 6 kg/cm 17 kg/cm2 100 kg/cm2 250 kg/cm2
Answer Explanation

MCQs 5: In water wall furnace, the heat is transferred to the water-walls by _________________?

convection radiation conduction radiation and conducton radiation and convection
Answer Explanation

MCQs 6: The feed check valve is used in order to ______________________?

regulate flow of boiler water check level of water in boiler drum recirculate unwanted feed water allow high pressure feed water to flow to drum and not allow reverse flow to take place none of the above
Answer Explanation

MCQs 7: The basic job of feed water treatment in boilers is to overcome the problem of __________________?

corrosion scale carryover embrittlement all of the above
Answer Explanation

MCQs 8: The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?

increases decreases remains unchanged increases/decreases depending on steam temperature requirements unpredictable
Answer Explanation

MCQs 9: For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?

more heating surface less heating surface equal heating surface heating surface depends on other parameters none of the above
Answer Explanation

MCQs 10: Film boling occurs at _______________________?

very low pressure atmospheric pressures medium pressures very high pressures none of the above
Answer Explanation

MCQs 11: During storage, the heating value of coal __________________?

increases decreases remains constant may increase or decrease depending upon the method of storage none of the above
Answer Explanation

MCQs 12: Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________?

increases decreases remains unaffected first increases and then decreases first decreases and then increases
Answer Explanation

MCQs 13: Deaeration of feed water is carried out because it reduces ____________________?

cavitation of .boiler feed pumps corrosion caused by oxygen heat transfer coefficient pH value of water weight of water to be handled
Answer Explanation

MCQs 14: Overfire burning is the phenomenon of _____________________?

supply of excess, air supply of excess coal burning CO and unburnts in upper zone of furnace by supplying more air fuel bed firing none of the above
Answer Explanation

MCQs 15: In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?

remain unaffected improve C. worsen may improve/worsen depending on size unpredictable
Answer Explanation

MCQs 16: The condition of steam in boiler drum is always ___________________?

dry wet saturated supersaturated superheated
Answer Explanation

MCQs 17: Calorific value of coal is of the order of _______________________?

200-400 kcal/kg 800-1200 kcal/kg 2000-4000 kcal/kg 5000-8000 kcal/kg 8000-10,000 kcal/kg
Answer Explanation

MCQs 18: Boiler parameters are expressed by ___________________?

tonnes/hr. of steam pressure of steam in kg/cm2 temperature of steam in °C all of the above none of the above
Answer Explanation

MCQs 19: Feed water conditioning in thermal power plants in done to__________________?

reduce hardness and for removal of solids increase efficiency-of thermal power plant increase *heat transfer rate increase steam parameters all of the above
Answer Explanation

MCQs 20: The capacity of induced draft fan compared to forced draft fan in a boiler is__________________?

same more less less or more depending on size of boiler unpredictable
Answer Explanation

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