18.18.The concept of ___________, aimed at increasing the thermal efficiency of a heat engine, uses heat that would normally be rejected into the low-temperature sink to preheat the air into the combustion chamber.
19.19.For the diesel engine, the discharge of the injection pump is led directly to the _________ , which comprises a spring-loaded fuel valve mounted on the fuel nozzle.
(C) fuel injector
20.20.Which component of diesel engine is inserted in a cylinder block and enclosed at the top by a cylinder head to form the combustion space above the piston?
(A)Water jacket (B) Cylinder liner (C)Piston crown
24.24.What devices are used to support the shafting in essentially a straight line between the main propulsion engine and the desired location of the propeller?
(A)Flange couplings (B)Reduction gears (C)Clutches
25.25.Which technical term is referred to as the zero-potential reference of an electric/electronic system?
(A)Penetration (B)Filtering (C)Shielding
36.36.When the situations occurred in the machine space that could affect the speed, maneuverability, power supply or other essentials for ensuring the safe operation of the ship, which authority should be informed as soon as possible?
(A)Chief marine engineer
(C) The bridge
37.37.What is the distance between TDC and BDC for a diesel engine?
(B)Thermodynamic process (C) Stroke (D)Scavenging
38.38.What is the ratio of cylinder volume to clearance volume for a diesel engine?
(A) Compression ratio
(B)Expansion ratio (C)Clearance ratio (D)Firing ratio