12. 21:00 Before enter into the SOx Emission Control Area ( SECA)in EU, switched fuel oil to be
used with low sulphur fuel oil. The sulphur content S% should be ______________ .
(A) without restrictions.
(B) less than or equivalent to 1.5%
(C) less than or equivalent to 0.1%
(D) less than or equivalent to 0.5%
18. Followed the ________ procedure after completion of the overhaul of No.5 cylinder unit of main
engine with all piston rings renewed.
(A) sea trial
(B) running in
(C) mooring trial
(D) model test
19. _____________ is a measure of how much the engine compresses the air inside the cylinder. .
(A) Compression ratio
(B) Temperature rise
(C) Pressure drop
(D) Stroke bore ratio
31. Which type of valve is installed to isolate machinery, equipment, and piping components for
system operation, maintenance and overhaul, and damage control?
(A) Constant-flow valve
(B) Relief valve
(C) Safety valve
(D) Stop valve
33. Which of following is a short flow passage of converging or converging-diverging flow area
whose function is to convert thermal or pressure energy into kinetic energy?
(A) compressor
(B) nozzle
(C) check valve
(D) pressure regulating valve
34. What is the measure to indicate whether the piston rings and valves are sealing tightly?
(A) Scavenging pressure
(B) Maximum cycle pressure
(C) Mean effective pressure
(D) Compression pressure