單項選擇題Fire alarm system thermostats are actuated by（）.

A.smoke sensors
B.the difference in thermal expansion of two dissimilar metals
C.pressure loss due to air being heated
D.an electric eye which actuates when smoke interferes with the beam


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1.單項選擇題Except in rare cases，it is impossible to extinguish a shipboard fire by（）.

A.removing the heat
B.removing the oxygen
C.removing the fuel
D.interrupting the chain reaction

2.單項選擇題Control valves of a CO2 system may be located within the protected space when（）.

A.it is impractical to locate them outside
B.there is also a control valve outside
C.the CO2 cylinders are also in the space
D.an automatic heat-sensing trip is installed

3.單項選擇題CO2 cylinders，which protect the small space in which they are stored must（）.

A.NOT contain more than 200 pounds of CO2
B.be automatically operated by a heat actuator
C.have an audible alarm
D.All of the above

4.單項選擇題CO2 cylinders equipped with pressure actuated discharge heads will discharge automatically when（）.

A.the discharge valve is open
B.the control box glass is broken
C.pressure from the control cylinders is detected
D.the control cylinders have been completely discharged

5.單項選擇題Automatic mechanical ventilation shutdown is required for CO2 systems protecting the（）.

A.machinery spaces
B.cargo compartments
C.living quarters
D.galley