Which of the valves listed should be used either in the fully opened or the fully closed position?（）

单项选择题If a refrigeration compressor is running continuously without lowering the temperature in the refrigerated space, the trouble may be （）.

A.a shortage of compressor oil
B.warm food in the refrigerator
C.excessive condenser cooling water
D.a shortage of refrigerant

单项选择题In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause （）.

A.molecular fluid vibration
B.energy losses
C.wide pressure variations
D.mechanical damage to control valves

单项选择题Which of the conditions listed represents the greatest effect of excess frost accumulation on the evaporator coils?（）

A.Keeps the refrigerated space cooler
B.Reduces the efficiency of the plant
C.Takes the load off the compressor
D.Has no affect on the system

单项选择题When the vessels steering wheel on the navigation bridge is turned, the difference existing between the position of the wheel and that of the rudder is known as （）.

A.proportional band
B.the error signal
C.the reset signal
D.feedback

单项选择题Which of the listed statements is correct concerning refrigeration systems?（）

A.Dehydrators must be used continuously in a refrigeration system
B.A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours
C.A thermostatic expansion valve is used to control refrigerated space temperature
D.The liquid receiver functions to collect and remove non- condensable gases