单项选择题Tube leaks in the distillate cooler of a two stage flash evaporator will result in ().

A.loss of second stage vacuum
B.contamination of the distillate
C.lower feed inlet temperature
D.contamination of the second stage condenser


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1.单项选择题The pressure of a liquid leaving the pump can be referred to as the ().

A.total head
B.discharge head
C.net positive suction head
D.suction head

3.单项选择题Which of the following statements describes the relationship between viscosity and specific gravity?()

A.Liquids with different viscosities will always have the same specific gravity
B.Liquids with different viscosities will never have the same specific gravity
C.Viscosity and specific gravity are directly proportional
D.Viscosity and specific gravity are not related in that one does not define or limit the other

4.单项选择题Some chloronated flourocarbon refrigerants may decompose into a toxic irritating gas if it is ().

A.stored at temperatures below 60 degrees Fahrenheit
B.charged into a system having copper fittings
C.allowed to mix with compressor oil
D.exposed to an open flame or hot surface

5.单项选择题A refrigeration system contaminated with moisture can be affected by ().

A.acid formation
B.sludge formation
C.ice in the expansion valve
D.All of the above

6.单项选择题R-12 is generally considered to be a safe, nontoxic, nonflammable, and non-explosive refrigerantIt can, however, become highly toxic when ().

A.superheated outside the system
B.in contact with an open flame
C.heated to the boiling point
D.All of the above

7.单项选择题Which of the following statements is/are true regarding hydraulic pumps in general? ()

A.Variable volumes can be obtained with gear pumps only by variation of the pump drive speed
B.A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaft
C.The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plate
D.All of the above

8.单项选择题The function of the hydraulic telemotor transmitter used in an electro-hydraulic steering gear system is to ().

A.transmit the rudder angle to the bridge indicator
B.prevent the control linkage from striking the stops when hard over
C.automatically purge all entrained air from the system
D.send hydraulic signals to the receiving unit

9.单项选择题To obtain maximum efficiency, two stage air compressors are usually ().

A.horizontally mounted
B.never fitted with intake filters
C.fitted with intercoolers
D.operated in an unloaded condition at all times

10.单项选择题Which of the following statements is true concerning the overall efficiency of air compressors?()

A.High pressure compressors are more efficient than low pressure compressors
B.Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unit
C.Two stage compressors are generally more efficient than single stage compressors
D.The volumetric efficiency is decreased in multistage compressors