14.14. In general, a cylinder of a diesel engine consists of a cylinder ____ that is inserted in a cylinder block and enclosed at the top by a cylinder head to form the combustion space above the piston.
(B) jacket (C) crown (D) skirt
17.17. Which property of residual fuel is controlled by using the heating equipment in order to ensure the flow between the fuel-tank and the engine?
(D) Flash point
18.18. Although the majority of low-speed engines and many medium-speed engines are operated on heavy fuels, there is still a balance to be struck between the lower cost of the heavier fuels and the inconvenience and greater cost of fuel treatment and increased engine maintenance that
inevitably results from their use. Therefore,
(A) the use of heavy fuels could increase the cost of fuel treatment.
(B) the use of heavy fuels could reduce the maintenance duty.
(C) the inconvenience of fuel treatment is induced by the increased engine maintenance.
(D) the use of heavy fuels is not appropriate for low-speed engine but is acceptable for medium-speed engine.
19.19. Viscosity is a measure of a fuel’s resistance to flow. The viscosity of a petroleum oil increases when the oil is cooled and decreases when it is heated. The viscosity value of oil must always be associated with the temperature at which the viscosity was determined. Based on these descriptions, which statement is correct?
(A) The oil temperature is not a control parameter of viscosity but the pressure.
(B) The increased temperature reduces the viscosity of oil.
(C) The viscosity value of oil is associated with the temperature at which the oil was sampled.
(D) The viscosity value of oil is associated with the temperature and pressure at which the oil was sampled.
36.36. Which component is used in a diesel engine to convert the reciprocating motion into rotational motion and to transfer the engine power for propulsion?
(D) Thrust bearing
38.38. Which devices have a mechanism in the propeller hub that can be operated remotely to change the propeller pitch from a maximum design ahead pitch to a maximum design astern pitch?
(A) Fixed angle propellers
(B) Fixed pitch propellers
(C) Detachable-blade propellers
(D) Controllable-pitch propellers
39.39. What is the process of cooling or removing heat to lower the temperature of a space, or items to be stored in the space, to a temperature below the temperature of the surrounding area?
40.40. When the fluid is moved over the heat transfer surface by an external force, such as that provided by a pump, which type of heat transfer is referred to?
(A) Natural convection
(B) Forced convection
(C) Centrifugal heat transfer
(D) Two-phase convection