单项选择题X 纠错
A.Degree of saturation
B.Saturation temperature
C.Superheated temperature
D.Degree of superheat
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单项选择题
A.pump must always be primed
B.volute must impart a radial and rotary motion of the water suction side
C.connection must guide the liquid to the lantern rings
D.stuffing box should not be allowed any water leakage
单项选择题
A.change in impeller diameter
B.square of the impeller diameter
C.cube of the impeller diameter
D.impeller efficiency for large changes in the size of the impeller
单项选择题
A.the suction pressure to decrease
B.the suction temperature to increase
C.increased ice formation on the evaporator coil
D.excessive short cycling of the compressor
单项选择题
A.Lobe
B.Screw
C.Radial piston
D.Volute
单项选择题
A.They are particularly suited for pumping high viscosity fluids
B.They are started with the discharge valve opened
C.The flow of liquid is developed by imparting energy due to the rotation of an impeller
D.They are always mounted in a horizontal position
单项选择题
A.refrigerant pressure in the evaporator
B.cooling water temperature to the condenser
C.heat load in the refrigerator compartment
D.solenoid valve in the liquid line
单项选择题
A.compressor
B.condenser
C.expansion valve
D.evaporator
单项选择题
A.bimetallic type
B.diaphragm type
C.bourdon tube type
D.resistance-temperature type
单项选择题
A.evaporator coils
B.liquid strainer
C.compressor
D.condenser
单项选择题
A.suction side of a bilge pump
B.exhaust manifold of an auxiliary diesel
C.discharge line from an air compressor
D.chemical feed tank of an evaporator