Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead, it therefore follows that the bus-bars are continuously alive（） the life of the ship.
1、Always ensure that the turning gear is
Always ensure that the turning gear is（）, even at the quay, the wake from other ships may turn the propeller and thus the engine.AdisengagedBengagedCassembledDdisassembled
2、Which certificate is always issued by
Which certificate is always issued by the China Classification Society（）.ALoadline certificateBSafety equipment certificateCSafety construction certificateDSafety cargogear certificate
3、Copper is often used as an electrical
Copper is often used as an electrical conductor because it （）.Ahas high resistance at low temperaturesBhas a highly polished surfaceCis able to pass current with little oppositionDholds insulation together well
4、Electrical power is expressed in （）
Electrical power is expressed in （）AohmsBvoltsCampsDwatt
5、A vessel’s Derat Certificate is always
A vessel’s Derat Certificate is always issued by （）.AClassification SocietyBCargo Survey BureauCEnvironmental Protection AgencyDPublic Health
6、The unit of electrical power is the __
The unit of electrical power is the _____.AampereBkilovoltCwattDfarad