A branch line valve of a fire extinguishing system on a ship must be marked with the（）.
1、An example of class "A" fire is a/an （
An example of class "A" fire is a/an （）.Aelectrical fire in the engine roomBoil fire in the engine room bilgesCoil fire involving a grade "A" petroleum productDmattress fire in a stateroom
2、If the compensating needle valve of a
If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）Ahave a larger than normal dead b...
3、A cutoff valve in the fire-main system
A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.Adamage from crane operationsBbeing used for wash down purposesCaccidental diversion of flow to wrong locationDfreezing
4、A(n) （） is a special type of valve whi
A(n) （） is a special type of valve which prevents the passage of steam but allows condensate to pass.Acheck valveBnon-return valveCsteam trapDquick closing tra
5、When must a dry chemical fire extingui
When must a dry chemical fire extinguisher be recharged?（）AAfter each useBWhen the air temperature exceeds 90°FCEvery 6 monthsDEvery 12 month
6、Which types of portable fire extinguis
Which types of portable fire extinguishers are designed for use on electrical fires?（）ADry chemical and carbon dioxideBFoam (stored pressure) and soda-acidCCarbon dioxide and foam (stored pressure)DDry chemical and soda-acid