单项选择题

The heat gained per pound of refrigerant in the evaporator is known as the（）.

A.latent heat of vaporization
B.sensible heat
C.refrigerating effect
D.specific heat of vaporization

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单项选择题

Which of the listed types steam traps operates on the principle that hot water flashes to steam when its vapor pressure is rapidly reduced?（）

A.Ball float
B.Thermostatic
C.Bimetallic
D.Impulse

单项选择题

On all vessels equipped with refrigeration units of over 20 cubic foot capacity, （）.

A.a gas mask suitable for protection against each refrigerant used, or a self contained breathing apparatus must be provided
B.it is the sole responsibility of the chief engineer to ascertain that all members of the engineering department are familiar with the use of gas masks or breathing apparatus
C.spare charges shall be carried for at least 50% of each size and variety of gas masks and/or self contained breathing apparatus
D.all of the above

单项选择题

The emergency bilge suction valve is typically used （）.

A.to inject cleaning additives when the bilges are extremely dirty
B.when the main condenser becomes fouled, in order to provide additional cooling water circulation
C.to connect the rose box to the independent bilge suction
D.if the bilges become flooded and they can not be emptied by any other means