單項(xiàng)選擇題When there is a fire in a large electric motor, normally the very FIRST step is to （）

A.secure the electric supply
B.ventilate area to remove smoke
C.start the fire pump and lead out hose
D.apply foam


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1.單項(xiàng)選擇題When working on a high voltage circuit, you should always have another person present with you.This person should have a good working knowledge of （）

A.the circuit being worked on and the location of all switches and circuit breakers controlling it
B.first-aid techniques for treating electrical shock
C.cardiopulmonary resuscitation (CPR)
D.All of the above

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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