41. In a La-mont boiler, there is a __________ circulation of water and steam.
forced
natural
✅ The correct answer is option A.
Steam Boilers and Engines MCQs
42. The indicated thermal efficiency is defined as the
ratio of thermal efficiency to the Rankine efficiency
ratio of brake power to the indicated power
ratio of heat equivalent to indicated power to the energy supplied in steam
product of thermal eff
✅ The correct answer is option C.
43. The function of a superheater is to heat the feed water by utilising the heat in the exhaust flue gases before leaving through the chimney.
Yes
No
✅ The correct answer is option B.
44. The crown of the fire box is made hemispherical in order to resist intense heat in the fire box.
TRUE
FALSE
✅ The correct answer is option A.
45. The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called
natural draught
induced draught
forced draught
balanced draught
✅ The correct answer is option B.
46. The efficiency of a boiler is defined as
ratio of heat actually used in producing steam to the heat liberated in the furnace
ratio of the mass of steam produced to the mass of total water supplied in a given time
ratio of the heat liberated in the furnace to the heat actually Used in producing steam
none of the above
✅ The correct answer is option A.
47. The ratio of the __________ to the volume at cut-off is called expansion ratio.
swept volume
clearance volume
✅ The correct answer is option A.
48. The draught in locomotive boilers is produced by a
chimney
centrifugal fan
steam jet
none of these
✅ The correct answer is option C.
50. The number of water level indicators in a boiler are generally __________ in number.
one
two
three
four
✅ The correct answer is option B.