14.14. Before starting propulsion engines that are directly connected to the propeller, permission must be obtained from which authority?
(A) The bridge
(B) The engine room
(C) The marine engineer on duty
(D) The first marine engineer
15.15. Check valves must be provided on pump suctions to prevent pumping through the standby pump to the sump. Pump isolating valves should be provided to permit underway repair of either pump. Based on these descriptions, which is the correct statement?
(A) The isolating valves must be non-return valves.
(B) The check valve also needs to be positioned at the pump exit in order to improve the pumping efficiency.
(C) The check valve allocated on pump suctions permits no flow from the idle pump into the sump.
(D) The check valve allocated on pump suctions permits the isolation of the running and standby pumps so that the isolating valves could be ignored for the emergency operation.
27.27. Which type of valve is designed to open when the inlet pressure exceeds a set maximum value and discharge the system fluid, thereby preventing overpressure?
(A) Back-pressure regulating valve (B) Pressure reducing valve (C) Relief valve
(D) Throttle valve
29.29. 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?
38.38. When can the cover of the crank case of a diesel engine be opened for investigation?
(A) When the engine is running.
(B) At least fifteen minutes after the engine is stopped.
(C) When the engine is operated at the overloaded condition.
(D) The cover of the crank case can only be opened during the sea trial.