更多"To add refrigerant to the low side "的相关试题:
[单项选择]To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.
A. discharge service valve as a vapor
B. suction service valve as a liquid
C. charging valve as a liquid
D. condenser purge valve as a vapor
[单项选择]Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.
A. leaky discharge valves on the LP cylinder
B. leaky discharge valves on the HP cylinder
C. insufficient intercooler cooling
D. low ambient air pressure
[单项选择]What separate the high pressure side from the low pressure side in a refrigeration system?（）
A. Condenser and thermal expansion valve
B. King and solenoid valves
C. Compressor and thermal expansion valve
D. Condenser and solenoid valve
[单项选择]Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.
A. globe valves
B. butterfly valves
C. gate valves
D. reducing valves
[单项选择]Which condition indicates the air side fouling of an after-cooler on a turbocharged diesel engine?（）
A. An increased air temperature differential between the cooler inlet and outlet
B. A decrease in the air pressure differential across the cooler
C. Excessive condensate forming in the air box
D. A decrease in the air temperature differential between the cooler inlet and outlet
[单项选择]On small, low pressure, air compressors, the cylinders are usually lubricated by the （）.
A. splash method
B. mechanical force feed lubricators
C. detached sump method
D. internal cooling passages in the crankshafts and connecting rods
[单项选择]The low pressure side of a refrigeration system is considered to exist from the （）.
A. expansion valve to the compressor
B. receiver to the expansion coil
C. expansion valve to the evaporator
D. condenser to the expansion valve
[单项选择]Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）
A. The pump delivers full capacity when started, but gradually slackens off toan abnormally low flow
B. The pump packing gland overheats after short operating periods
C. The motor over-current protective device continually shuts the pump down
D. Pounding noises can be heard at the pump suction chest
[单项选择]In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）
A. broken valve springs
B. tight drive belts
C. high line voltage
D. air in the system
[单项选择]Air receivers installed in starting air systems are to be （）.
A. cylindrical in shape with service connections located at the top and bottom
B. opened and made available for inspection during biannual inspections provided
C. with automatic drain traps for the removal of moisture
D. so installed as to make the drain connections effective under extreme conditions of trim
[单项选择]When a vessel is swinging from side to side off course due to quartering seas，the vessel is （）.
A. broaching
B. pitchpoling
C. rolling
D. yawing
[单项选择]A lashing used to secure two barges side by side，lashed in an X fashion，is called a（）.
A. backing wire
B. scissor wire
C. face wire
D. breast wire
[单项选择]A tow astern is veering from side to side on its towline. The best way of controlling the action is to（）.
A. trim the tow by the bow
B. trim the tow by the stern
C. list the tow to windward
D. adjust the length of the towing bridle
[单项选择]Air entering an air-cooled refrigeration system is indicated by （）.
A. frosting of the liquid line
B. higher than normal head pressure
C. a clear sight glass
D. abnormally cold reefer boxes
[单项选择]Compressed air is supplied by air compression to （）.
A. the air receivers
B. the starting valves
C. the cylinder covers
D. the distributors
