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提问人：网友sulynn 发布时间：2022-01-07

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Moisture absorbed in the winding or condensed on the surface of electrical machinery nsulation

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

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

C.will enhance insulation resistance only if it is no salt

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 winding or condensed on the surface of electrical machinery nsulation”相关的问题

第1题

In the following statements about the principle of the low level controlling, which is WRONG? 0

A.Low level is monitored on the drain tank and header tank.

B.If there is high differential the filters pressure across the circulating

pumps is alarmed

C.The lubricating oil purifier cannot take oil from the drain tank

D.If the sea water pressure falls, this also operates an alarm

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第2题

any pointer positionDue to failure of one of the carbon brushes the excitation voltage is lost on one alternator that operating in parallel.Then that alternator will()

A.completely loose its share of the load causing the auxiliary engine to speed up.

B.overload due to reduced voltage output and increased current

C.continue to share the active load(kw)but have high very reactive load

D.try to take all the load and so trip the main circuit breaker

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第3题

According to STCW Code,which of the following functions must an engineer officer possess?( )

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第4题

A.mode of control,whereby the speed of motion the final control element is linearly proportional to the deviation of the controlled variable from set point, is called

A.rate control

B.derivative control

C.two-position control

D.integral control

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第5题

The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the( ).

A.flash point

B.fire point

C.upper explosive limit

D.lower explosive hmlt

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第6题

The effect that exhaust gas recirculation can reduce NOX formation is partly due to a reduction of the()concentration in the combustion zone and partly due to the content of water and carbon dioxide in the exhaust gas.

A.Oxygen

B.Nitrogen

C.Sulphur

D.Freon

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第7题

200 Start the turning gear， and with some one hand-operating the cylinder lubricators at regular intervals, and with the indicator cocks@,

and with the control gear in theoposition, give the engine at least one complete turn

A.open; stop

B.closed, stop

C.open; start

D.closed: start

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第8题

You are attempting to parallel two AC.generators, and the synchroscope pointer revolving in the fast direction.This indicates that the frequency of the incoming machine is

A.higher than the bus equency

B.lower than the bus equency

C.the same as the bus frequency but out of phase with it

D.same as the bus frequency and the circuit breaker may be closed at

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第9题

The activated sludge strength should be checked at regular intervals and it is good that the color of the aeration compartment water is

A.chocolate

B.yellow

C.blackish

D.ivory-white

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