单项选择题
An emergency generator, driven by an internal combustion engine, shall be tested under load for a minimum of 2 hours at least once every （）
A.week
B.2 weeks
C.month
D.3 months
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相关考题
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单项选择题
Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out （）
A.De-energize the applicable switchboard bus
B.Bypass the interlocks
C.Secure and tag the supply circuit breaker in the open position
D.Station a man at the circuit supply switch -
单项选择题
Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component （）
A.Wear rubber gloves and boots
B.Use only approved non-conducting tools
C.Ground the case of the machine before beginning any repairs
D.Open the supply circuits and tag the switches -
单项选择题
The most common type of AC service generator found aboard ship is the stationary （）.
A.electromagnetic field, revolving armature type
B.electromagnetic field, oscillatory armature type
C.armature, oscillatory electromagnet field type
D.armature, rotating electromagnetic field type
