[单选题]The concentration of total dissolved solids in the boiler water can increase as a result of _______.
[单选题]The most common method of cleaning fuel is by _____ and there are various makes of purifiers and clarifiers in use such as Alfa-laval, Titan, Sharples etc.
[单选题]The evaporating pressure in vapor compression refrigeration plant should be ____atmospheric pressure.
[单选题]The process of supplying a diesel engine cylinder with air at a pressure greater than atmospheric is called _______.
[单选题]The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its _____.
[单选题]Which of the listed methods of heat transfer takes place when two substances of different temperatures are in physical contact with each other?
[单选题]If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or adjacent compartments may need to be ____.
[单选题]This arrangement is _______ if the elements are directly connected to one another and the control action takes place without human involvement.
[单选题]In a diesel engine, blow-by is a result of combustion gases leaking into the crankcase past the ________.
[单选题]A badly warped boiler water tube can be reworked and bent back into shape by _______. I. heating it with a torch and reforming it with a soft mallet II. Cold pressing it back into shape with a hydraulic jack