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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
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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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单选题Routine maintenance of lead acid batteries should include （）.A
keeping the terminals cleanB
coating cable connections with petroleum jellyC
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prevent them from falling when the vessel rollsB
protect personnel from electrical shockC
increase their operating efficiencyD
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For the SQL Server Agent, you should enable a fail-safe operator B
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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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单选题Complete maintenance of electrical motors should include periodic checks for machine （）A
vibrationB
watertight integrityC
speed droopD
reactive power
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单选题A fire in electrical equipment should be extinguished by using（）.A
salt waterB
foamC
low-velocity fogD
CO2
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单选题Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include （）A
changing the air filterB
recharging the systemC
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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