單項(xiàng)選擇題Which of the following statements is correct concerning heat transfer?（）

A.Heat is given off from a high temperature region known as a heat sink
B.Heat transfer rate is affected most by the size of the heat sink involved
C.Heat transfer rate is affected most by the temperature difference between the heat source and the heat sink
D.Heat transfer by radiation will occur only by mass motion of a fluid substance


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1.單項(xiàng)選擇題Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）

A.Maritime Safety Administration
B.Master of the vessel
C.Chief Engineer
D.Chief Mate

2.單項(xiàng)選擇題The rate of heat transfer from a hot region to a cold region is affected most by the （）.

A.size of the heat sink
B.temperature difference between the regions
C.size of the heat source
D.total heat of the system

3.單項(xiàng)選擇題A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.

A.the four-way control valve failing to shift
B.the bleeder valve sticking in the open position
C.cold hydraulic fluid
D.a clogged air vent falter on the oil reservoir

4.單項(xiàng)選擇題If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.

A.add fluid that is the same color as the fluid in the reservoir
B.add turbine oil because it is always a good substitute
C.add any oil that has the same viscosity as the hydraulic fluid
D.check the winch manufacturers instruction book

5.單項(xiàng)選擇題The output volume of a positive fixed displacement pump can be changed only by （）.

A.changing the angle of the tilting plate
B.changing the speed of the pump
C.moving the slide block and rotor
D.moving the shaft trunnion block