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单选题
Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid lineIf excess moisture is present in the system, the indicator will （）
A
activate the driers
B
change color
C
secure the compressor
D
add a predetermined amount of liquid drier
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考题
单选题Moisture is removed from a refrigeration system by（）.A
bleeding refrigerant from the condenserB
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单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.A
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考题
单选题The moisture equilibrium chart can be used to determine the（）.A
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单选题Moisture in a refrigeration system can cause （）.A
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单选题Which of the listed statements is correct concerning refrigeration systems?（）A
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A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hoursC
A thermostatic expansion valve is used to control refrigerated space temperatureD
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单选题Lubricating oil systems are fitted with a wide variety of strainers some of which can be cleaned in site while others have replaceable cartridgesThe bold and italic word “which” means （）.A
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strainersD
cartridges
考题
单选题You are on a multiple-product chemical tanker with orders to load diethylamine.What is NOT a requirement for transporting this cargo（）.A
You must have two toxic vapor detectors or the pumproom must meet special requirementsB
Each crew member must be provided with an emergency escape breathing apparatusC
A person taking cargo samples must wear protective clothingD
If you are carrying propionic acid also，the venting systems must be segregated
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