更多"Safety valves on a boiler vent to t"的相关试题:
[单项选择]The safety valves should be tested and adjusted when the boiler survey is （）
A. completed
B. carried out
C. cleaned
D. steamed
[单项选择]The safety valves are mounted in pairs to （） the boiler against overpressure.
A. use
B. release
C. protect
D. effect
[单项选择]The purpose of the safety relief valves installed on an auxiliary boiler is to （）.
A. relieve excess fuel oil pressure during the “off” fire cycle
B. admit water to the dry pipe
C. throttle the forced draft fan output for proper combustion
D. reduce excess steam pressure in the boiler
[单项选择]The boiler feed water check valves are located on the （）
A. feed pump suction line
B. hot well
C. shell of the feed heater
D. feed lines to the boiler
[单项选择]A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.
A. monkey
B. donkey
C. waste heat
D. main
[单项选择]In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.
A. the beveled edges of the intake valves provide for serf-centering during seating
B. intake valves utilize stellite-coated valve seat inserts which reduce wear
C. the volume of air passing through intake valves is less than the volume of air passing through exhaust valves
D. intake valves are less affected to the corrosive action of exhaust gases
[单项选择]Internal combustion engine crankcase vent outlets must be equipped with （）
A. hinged rain guards
B. corrosion resistant flame screens
C. dipsticks for measuring oil levels
D. crankcase ventilation fans
[单项选择]A donkey boiler is （）.
A. one to supply steam to the main propulsion turbine
B. an auxiliary boiler
C. A and B
D. neither A nor B
[单项选择]The brickwork surrounding the firebox of a boiler is known as（）.
A. refractory
B. the screen wall
C. the water wall
D. fire plate
[单项选择]The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.
A. ensure feed water flow into the boiler
B. keep the steam drum pressure high
C. prevent water hammer in the feed line
D. help the feed water flash to steam
[单项选择]For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）
A. High oxygen concentration
B. Low pH
C. Proper alkalinity
D. All of the above
[单项选择]Heavy soot accumulations in an auxiliary boiler could be caused by（）
A. water in the fuel oil
B. excessive cycling
C. high fuel oil pressure
D. improper burner maintenance
[单项选择]The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）.
A. hour
B. day
C. week
D. month
[单项选择]Diesel engine waste heat boiler construction is usually of the fire-tube or（）
A. cyclone furnace boiler type
B. dry back boiler type
C. water-tube type
D. critical circulation boiler type
[单项选择]Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.
A. cooling water pump
B. nozzle cooling passages
C. cylinder jackets
D. heat exchanger
[单项选择]Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A. double bottom fuel oil tank temperature
B. heater supply steam flow
C. pressure of the fuel supplied to the burners
D. attemperator steam flow in the heater discharge circuit
[单项选择]Thermostatic expansion valves can be adjusted for （）.
A. suction pressure only
B. head pressure only
C. superheat only
D. suction pressure and box temperature
