17.17.The products of combustion of marine fuels include sulfur dioxide, which, when combined with
water vapor, forms acids such as the sulfurous acid and sulfuric acid. These acids cause cold- end corrosion if allowed to condense on boiler components of flue gas ducting. Therefore, in
order to prevent the cold-end corrosion, which action is not to be taken?
(A)To ensure the temperature of exhaust gas is always above the condensation temperature
(B)To install more heat exchangers in the flue gas ducting so that the temperature of exhaust
gas is further reduced.
(C)To prevent any chemical process that formulates the acid within the boiler components of flue
(D)To ensure there is no water-vapor condensate formed within the flue gas by controlling the
flow temperatures in the flue-gas ducting.
18.18.To achieve the processes required of the Brayton cycle, four basic components must be
included, namely, a combustor, a turbine, a , and a heat sink.
(C)feed water pump
20.20.What is the temperature recorded by a common thermometer with a moistened wick placed
around the bulb and a stream of air passed over the wick?
21.21.The main function of the intercooler of multistage air compressor is .
(A)to increase the enthalpy of working fluids
(B)to increase the entropy of working fluids
(C)to reduce the specific volume of working fluids
(D)to increase the internal energy of working fluids
38.38.Which operation is performed with the objective to ensure the axis of engine shaft is straight,
uniformly supported by the bearings and properly positioned longitudinally when the engine is
running and under load?
(C)Towing tank test
39.39.Which type of marine propulsive engine is well suitable for merchant ships due to its simplicity
and fuel economy?
(B)Steam turbine engine
(C)Gas turbine engine