A.instantaneous voltage
B.average voltage
C.RMS voltage
D.peak voltage
您可能感興趣的試卷
你可能感興趣的試題
A.higher than the bus frequency
B.lower than the bus frequency
C.the same as the bus frequency but out of phase with it
D.the same as the bus frequency and the circuit breaker may be closed at any pointer position
A.speed of the prime mover
B.AC excitation to the field
C.DC excitation to the field
D.DC excitation of the voltage regulator
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 fresh water and contains no salt
D.reduces the amount of current supplied or drawn by the machine so horsepower is limited
A.lagging
B.leading
C.maximum
D.minimum
A.running at the same speed
B.grounded
C.of the same polarity
D.in phase
最新試題
When does auxiliary burner of incinerator put into operation? ()Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish
The ISPS Code consists of a mandatory section-Part A, which shows()
The treatment of the fuel oils involves storage, heating, filtering and()
If separating effect is not good, which measure should be taken ()
() is not installed on the main switchboar.
To shut down a diesel engine after it exceeds the set maximum speed,which type of device listed should be used?()
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?()
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated()
The additional mark ()in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is()