183. During storage, the heating value of coal
A.Increases
B.Decreases
C.Remains constant
D.May increase or decrease depending upon the method of storage
184. The relative heat absorption for successively added equal areas of boiler convection heating surfaces_
A.Increases
B.Decreases
C.Remains unaffected
D.First increases and then drcreases
185. Film boling occurs at
A.Very low pressure
B.Atmospheric pressures
C.Medium pressures
D.Very high pressures
186. Fire tube boilers are limited to a maximum design working pressure of
A.1 kg/cm2
B.6 kg/cm2
C.17 kg/cm2
D.100 kg/cm2
187. For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has
A.More heating surface
B.Less heating surface
C.Equal heating surface
D.Heating surface depends on other parameters
188. In water wall furnace, the heat is transferred to the water-walls by
A.STEAM BOILERS;ENGINES, NOZZLEg AND TURBINES
B.(a) convection
C.(b) radiation
D.(c) conduction
189. The feed check valve is used in order to
A.Regulate flow of boiler water .
B.Check level of water in boiler drum
C.Recirculate unwanted feed water
D.Allow high pressure feed water to flow to drum and not allow reverse flow to take place
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