11.11.What is the fluid employed as the heat absorber or cooling agent in any refrigerating process?
12.12.Which is not the potential source of pollution for a navigating ship?
(A)Cargo-oil piping system
(B)Ballast system of crude-oil tanker
(C)Global positioning system
13.13.Which device in the jacket water cooling system is used to maintain a static head on the suction
side of the system, and provide a convenient point for collecting vents and adding make-up feed?
21.21.The design of the waste-heat boiler heat transfer surface is largely a problem of convective heat
transfer, and in principle is the same as for the oil-fired boiler designs, except that the intertube
radiative conductance will be so low that it can be neglected. Based on this description, which
statement is false?
The intertube radiative conductance in a waste-heat boiler is an important factor to be
(B)The convective heat is a significant problem for evaluating the heat transfer surface in a boiler.
(C)The intertube radiative heat is negligible due to its relatively low value in a waste-heat boiler.
(D)The design of the waste-heat boiler heat transfer surface is the same as the design of oil-fired
boiler in principle.
22.22.Which section of the shafting system is used to secure the propeller?
(C)Stern tube shaft
23.23.Which event in those seawater systems is often prevented by continuously injecting chemical
38.38.What are the factors to be considered when the performance of the propulsive engine is
assessed?1engine speed 2load of ship 3maker of engine 4surface condition of ship-hull.