A.specific gravity
B.viscosity
C.S E number
D.hydrolytic stability
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A.microscopic steel shavings
B.abrasive waste
C.anti-oxidant compounds
D.oxidation by-products
A.increase the capacity of the coil
B.increase the superheat at the bulb
C.deliver more refrigerant to the coil
D.decrease the capacity of the coil
A.Centrifugal
B.Reciprocating
C.Gear
D.Rotary
A.a high suction head
B.rotating rings
C.badly worn bearings
D.a loose stuffing box gland
A.solenoid valve to seize
B.compressor to hunt
C.formation of flash gas in the liquid line
D.expansion valve to freeze open
A.insufficient condenser cooling water
B.excessive condenser cooling water
C.air in the refrigeration system
D.excessive refrigerant in the system
A.Thermal expansion valve frozen open
B.Suction gas heat exchanger bypassed
C.Condenser clogged or fouled
D.High pressure cutout switch inoperative
A.noise and vibration
B.an increase in discharge pressure
C.an increase in suction pressure
D.lifting of the relief valve
A.insufficient cooling water flow to the condenser
B.a low refrigerant charge in the system
C.the liquid valve is open too much
D.high evaporator superheat
A.dead band action
B.neutral zone action
C.range
D.on-off action
最新试题
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is ().
The control mode in which the final control element is moved from one of two flexed positions to the other is known as ().
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 ().
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?()
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
One cause of high head pressure occurring in a refrigeration system can be ().
Thermostatic expansion valves can be adjusted for ().