更多"A liquid sight flow indicator in a "的相关试题:
[单项选择]If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is （）.
A. too much refrigerant in the system
B. oil entrained in the refrigerant
C. less than a full charge of refrigerant in the system
D. ice crystals forming in the refrigerant
[单项选择]Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.
A. filled
B. evacuated
C. compressed
D. charged
[单项选择]A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently chargedIt is generally located in the（）.
A. high pressure liquid line
B. low pressure liquid line
C. high pressure vapor line
D. low pressure vapor line
[单项选择]A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the （）.
A. condition of the expansion valve
B. moisture in the system
C. condition of the compressor suction valves
D. condenser temperature
[单项选择]Compensated flow control or constant flow valves are used in hydraulic systems to（）
A. compensate for major leaks in the system
B. maintain the original fluid viscosity
C. allow for changes in pressure and temperature within the system
D. assure constant fluid temperature
[单项选择]When out of sight of land, a ship’s position can be found by using（）.
A. the coastal navigation
B. the celestial navigation
C. traditional navigation
D. the great circle navigation
[单项选择]What type of liquid is used in the liquid P/V breaker（）.
A. Hydraulic oil
B. Water-antifreeze mixture
C. Distilled water
D. Oil from the cargo
[单项选择]If liquid refrigerant accidentally comes in contact with the eyes, （） immediately.
A. rub the eyes
B. irritate the eyes
C. wash the eyes with a heavy boric acid solution
D. obtain medical help
[单项选择]low flow sensor位于（）
A. 主电子设备舱
B. 驾驶舱
C. 前电子设备舱
D. 空调舱
[单项选择]Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.
A. 97 times greater
B. 94 times greater
C. 10 times greater
D. 2 times greater
[单项选择]A pressure drop through the refrigerant liquid line may cause （）.
A. solenoid valve to seize
B. compressor to hunt
C. formation of flash gas in the liquid line
D. expansion valve to freeze open
[单项选择]The process during which liquid containing a reasonable amount of sensible heat at a particular pressure immediately changes into steam after admitted to a chamber at a lower pressure is called （）.
A. boiling off
B. flash evaporation
C. condensation
D. none of the above
[单项选择]When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.
A. flooding back
B. superheating
C. overflowing
D. recycling
[单项选择]Increasing the number of slack liquid tanks has the effect of raising the（）.
A. uncorrected KG
B. maximum allowed KG
C. virtual height of the center of gravity
D. metacentric height
[单项选择]Reducing the liquid free surfaces in a vessel reduces the（）.
A. roll period
B. metacentric height
C. waterplane area
D. vessel's draft
[单项选择]Increasing the number of slack liquid tanks has effect of raising the（）.
A. uncorrected KG
B. maximun allowed KG
C. virtual height of the center of gravity
D. metacentric height
[单项选择]If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
A. capacity will increase
B. capacity will decrease
C. suction pressure will increase
D. suction pressure will decrease
[单项选择]The valve best suited for throttling gas or liquid flow in a pipeline is the（）.
A. gate valve
B. globe valve
C. check valve
D. plug cock
