更多"A branch line valve of a fire extin"的相关试题:
[单项选择]An interlock in the remote operating valve line stops the valve （） when the engine turning gear is engaged.
A. to open
B. opening
C. open
D. opened
[单项选择]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（）.
A. damage from crane operations
B. being used for wash down purposes
C. accidental diversion of flow to wrong location
D. freezing
[单项选择]A fire main system must have enough fire hydrants so that each accessible space may be sprayed with（）.
A. a low velocity spray applicator
B. a water spray or solid stream
C. at least two spray patterns of water
D. at least 25 psi delivered pressure
[单项选择]The mechanical exhaust valve operation system is replaced by（）in an electronic controlled ME engine.
A. a system with a Hydraulic Power Supply (HPS) unit
B. a system with roller guides for exhaust valves
C. a system with an electronically controlled Alpha Lubricator
D. a system directly powered by electric motor
[单项选择]The ventilation system of your ship has fire dampers restrained by fusible links. Which statement is TRUE? （）
A. Fusible links must be replaced if a damper is activated
B. Fusible links are tested by applying a source of heat to them
C. Fusible links must be replaced at every inspection for certification
D. A fusible link will automatically open after a fire is extinguished and reset the damper
[单项选择]In the starting system, the automatic valve is controlled by（）, and the cylinder start valves are controlled by（）
A. pilot air；pilot air
B. handle；solenoid
C. handle；pilot air coming through the distributor
D. solenoid；pilot air coming through the distributor
[单项选择]The expansion valve on a Freon system controls the （）.
A. superheat of the gas leaving the compressor
B. back pressure in the evaporator
C. temperature of the icebox
D. superheat of the gas leaving the evaporator
[单项选择]A solenoid valve used in a refrigeration system should be installed （）.
A. with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valve
B. upright, sensing temperature of the box, and upstream of the thermal expansion valve
C. upright, sensing temperature of the box, and downstream of the thermal expansion valve
D. upright, sensing heat of the tail coil, and upstream of the thermal expansion valve
[单项选择]A non-return valve in the air delivery line near to the compressor must be （）type similar to the compressor discharge valve.
A. the low inertia
B. the high inertia
C. the low velocity
D. the high velocity
[单项选择]Which fire detection system is actuated by sensing a heat rise in a compartment?（）
A. Manual fire detection system
B. Automatic fire detection system
C. Smoke detection system
D. Watchman's supervisory system
[单项选择]In the fire main system, quick cleaning strainers are located at the（）.
A. pump suctions
B. pump discharge
C. fire hydrants
D. hose nozzle
[单项选择]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
[单项选择]（）is main emergency fire system in all merchant ships.
A. CO2 system
B. Foam system
C. Dry power system
D. Water supply system
[单项选择]A towing vessel’s fire detection system may be certified to comply with the Coast Guard’s towing vessel fire protection regulations by（）.
A. a Coast Guard inspector
B. a registered professional engineer
C. the owner or Master of the vessel
D. a licensed electrician
[单项选择]Each part of the fire-main system located on an exposed deck must be（）.
A. protected against freezing
B. locked to prevent theft
C. numbered sequentially
D. pressurized at all times
[单项选择]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time
[单项选择]The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.
A. be jammed
B. be opened
C. be seated
D. be broken
[单项选择]Fire dampers prevent the fire spreading through the process of （）.
A. convection
B. conduction
C. radiation
D. direct contact
