A.prevent grounds in branch circuits
B.prevent opens in motor circuits
C.permit momentary overloads without melting
D.guard lighting and electronic circuits
您可能感興趣的試卷
你可能感興趣的試題
A.Each has three separate but identical armature windings acted on by one system of rotating magnets
B.Each has one armature winding acted on by three identical but separate systems of rotating magnets
C.All three-phase alternators are designed to operate with a O8 leading power factor
D.The three phases always provide power to the load through three sets of slip rings and brushes
A.eliminate slippage
B.provide excitation
C.provide starting torque
D.increase efficiency
A.wash it with fresh water and apply an external source of heat
B.renew the windings
C.send it ashore to an approved service facility
D.rinse all electrical parts with a carbon tetrachloride cleaning solvent and then blow dry the motor with compressed air
A.the recommended current and voltage rating
B.higher current and voltage rating
C.higher current and lower voltage rating
D.lower current and higher voltage rating
A.prime mover governor
B.exciter generator
C.voltage regulator
D.reverse power relay
最新試題
The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）
The ISPS Code consists of a mandatory section-Part A, which shows（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
Under MARPOL Code the ship to which it applies has to carry （）
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
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.
The shipboard oil pollution emergency plan will be invalid after （）
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）