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【单项选择题】

Moisture absorbed in the windings or condensed on the surface of electrical machinery insulation （）

A、A.is good for long term preserving since most insulation is organic and contains some amount

B、B.lowers the insulation value and is a common cause of fault grounds in idle machines

C、C.will enhance insulation resistance only if it is fresh water and contains no salt

D、D.reduces the amount of current supplied or drawn by the machine so horsepower is limited

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更多“Moisture absorbed in the windings or condensed on the surface of electrical machinery insulation （）”相关的问题
第1题
[单选题] A hygroscopic cargo is define as a cargo（）.

A、capable of absorbing moisture in the form of a gas  B、capable of giving off moisture in the form of a liquid  C、that is shipped in a liquid stste  D、that will ignite in contact with water  

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第2题
[单选题] The presence of bubbles in a refrigeration system liquid line may （）.

A、promote refrigerant dehydration  B、be absorbed in the receiver  C、cause low condensing pressure  D、carry moisture and lead to corrosion  

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第3题
[] The moisture equilibrium chart can be used to determine the（）.

A、A.Absolute moisture content of the air surrounding a hygroscopic cargo when moisture equilibrium exists  B、B.Dew point temperature that the air surrounding a hygroscopic commodity will have when in moisture equilibrium with that commodity  C、C.Enthalpy of the air surrounding a hydroscopic cargo which is in moisture equilibrium with the cargo  D、D.Temperature at which moisture equilibrium will occur in a cargo hold containing a hygroscopic cargo  

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第4题
[] Clouds form（）.

A、A.as a mass of warm，humid air rises into the atmosphere and cools，condensing moisture into small droplets  B、B.as winds blow across bodies of water，the sun causes the moisture to be absorbed and move upward forming clouds  C、C.dry air compresses moisture from the atmosphere into clouds  D、D.when the relative humidity of the atmosphere is low  

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第5题
[] Cargo damaged due to water being present in a cargo hold，as a result of a leak in the hull plating，is said to be damage by（）. ① Free moisture ② Transfer of hygroscopic moisture Cargo damaged due to water being present in a cargo hold，as a result of a leak in the hull plating，is said to be damage by（）. ① Free moisture ② Transfer of hygroscopic moisture

A、A.① only  B、B.② only  C、C.Both ① and ②  D、D.Neither ① nor ②  

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第6题
[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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第7题
[单选题] Separation cloths may be used to（）.

A、absorb moisture from hygroscopic cargoes  B、fill gaps between layers of cargo  C、wrap cargo that leaks from packaging  D、keep bagged cargo leakage from contacting the deck  

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第8题
[] A tank which has been sealed for a long period of time can be dangerous because （）.

A、A.steel surfaces consume oxygen by rusting  B、B.sealed tanks usually form a vacuum  C、C.moisture condenses in the tank, displacing the oxygen  D、D.most tank coatings give off poisonous vapors in the presence of moisture  

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第9题
[单选题] In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the（）.

A、compressor  B、condenser  C、receiver  D、evaporator  

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