更多"If a liquid sight flow indicator in"的相关试题:
[单项选择]A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.
A. the system is fully charged
B. there is air leaking in from the condenser
C. ice crystals are forming in the refrigerant
D. the system contains less than a full charge of refrigerant
[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]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 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]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
[多项选择]使用gprs indicator caculator可以（）
A. TBF建立和释放情况
B. 数据流量统计
C. 小区GPRS拥塞统计
D. GPRS指标历史趋势统计
[单项选择]A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.
A. purifies
B. combinations
C. concentrations
D. filters
[名词解释]土壤指示植物 indicator plant of soil
[单项选择]A combustible gas indicator meter is calibrated to read the percentage of（）.
A. vapor to oxygen
B. the flammable limit concentration
C. the autoignition concentration
D. the lower explosive limit concentration
[单项选择]An oxygen indicator will detect （）.
A. concentrations of explosive gas
B. an oxygen deficiency in a space
C. the presence of harmful amounts of carbon monoxide
D. All of the above
[单项选择]The boom indicator tells the operator at what angle the boom is compared to the（）.
A. horizontal position of the boom
B. vertical position of the boom
C. horizontal position of the load being lifted
D. vertical position of the load being lifted
[多项选择]gprs indicator caculator软件完成功能包括（）
A. 信令跟踪和分析
B. GPRScounter提取和计算
C. 按小区分析GPRS指标
D. 统计PDP激活成功情况
[单项选择]If the meter needle of the oxygen indicator cannot be set to zero，what should be done? （）
A. Replace the batteries
B. Check the sampling tube for blockage
C. Adjust the final reading by the amount the needle is displaced from zero
D. Replace the platinum filament
[单项选择]An indicator on the main switchboard should show （） the emergency battery is in service or not.
A. that
B. when
C. if
D. whether
[单项选择]A combustible gas indicator is used to determine （）.
A. if there is sufficient oxygen to support life
B. the toxicity of flammable gases or vapors
C. the amount of CO2 present in flue gas
D. the presence of flammable gases or vapors in the air
