A.microscopic steel shavings
B.abrasive waste
C.anti-oxidant compounds
D.oxidation by-products
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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
最新試題
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
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?（）
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 （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
A salinity indicator is used to determine the （）.