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单选题
Complete maintenance of electrical motors should include periodic checks for machine （）
A
vibration
B
watertight integrity
C
speed droop
D
reactive power
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单选题Before doing maintenance on electrical equipment, you should （）.A
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单选题To extinguish an electrical fire, you should use （）.A
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单选题Electrical failures in motors are caused by the breakdown of insulation, which may be caused by （）A
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单选题The operator of electrical motors should keep a constant check on the loads they carry because （）A
low loads necessitate frequent insulation cleaningB
exceeding nameplate values shortens useful lifeC
energy is wasted if full loading is not utilizedD
power factor correction methods are load dependent
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examination for fractures and pittingD
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each time the chart is changedB
once per monthC
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单选题Routine maintenance of lead acid batteries should include （）.A
keeping the terminals cleanB
coating cable connections with petroleum jellyC
maintaining a trickle chargeD
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单选题All electrical appliances aboard a vessel should be grounded to（）.A
prevent them from falling when the vessel rollsB
protect personnel from electrical shockC
increase their operating efficiencyD
prevent unauthorized personnal from operating them
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For the SQL Server Agent, you should enable a fail-safe operator B
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You should modify the database maintenance plan, making it include a Notify Operator task that e-mails the appropriate operators. D
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单选题The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the（）.A
loss of residual magnetismB
absorption of moisture in the insulationC
insulation varnish flakingD
dirt collecting on the windings
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salt waterB
foamC
low-velocity fogD
CO2
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changing the air filterB
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changing compressor lubricantD
renewing container vacuum
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单选题Which statement is FALSE concerning precautions during fueling operations?（）A
All engines，motors，fans，etc. should be shut down when fuelingB
All windows，doors，hatches，etc. should be closedC
A fire extinguisher should be kept nearbyD
Fuel tanks should be topped off with no room for expansion
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