38.For a ship with direct-connected low-speed propulsive engine, which is usually the dominant
source of torque variation for the shafting system? (A)Engine power variation (B)Axial displacement of thrust bearing (C)Torsional vibration of propulsive shaft (D)Longitudinal vibration of engine
39.What device is generally designed to avoid the exposure of fire to the air and to put out the
fire? (A)fire extinguisher (B)fire alarm (C)fire detector (D)fire exposurer
22.What is the main function of labyrinth packing in a steam turbine engine?
(A)To improve the dynamic balance (B)To increase the critical speed (C)To reduce the vibration (D) To minimize the leakage of working fluid
8. The IMO had come up with a ______________ on newly adoption of ECA to deal with the global
air pollution issues.
(A) less efficient
(B) more or less restriction
(C) further restriction
(D) more sufficient
38. Which technical term is referred to as the zero-potential reference of an electric/electronic
system?
(A) Penetration
(B) Filtering
(C) Shielding
(D) Ground
14. Which tool is designed to save the lives of on board people in case of emergency at sea?
(A) Electric equipment
(B) Lifeboat
(C) Bilge pump
(D) Hatch
28. What are the items written by the captain for the accident report?①name of ship ②type
of ship ③date and time of casualty ④regulations associated with statements
(A) ①②③
(B) ②③④
(C) ③④①
(D) ④①②
9. For the main propulsion engine of the motor ship, the engine jacket water and lubricating
oil must be cooled and water or oil generally also used in cooling the pistons. What equipment is
above description?
(A) Compressor
(B) Separator
(C) Heat exchanger
(D) Evaporator