更多"Main steam and exhaust pipes for wi"的相关试题:
[单项选择]All items such as steam pipes, exhaust pipes and fittings which, because of their location and operating temperature, present a hazard should be adequately lagged.That means the items should（）
A. not be put into operation too early
B. be pay adequate attention to
C. be used only when necessary
D. be coated with certain material
[单项选择]Large pipes or （） are fitted between the steam and water drums to ensure good natural circulation of water.
A. fire-tubes
B. furnaces
C. down-comers
D. soot-blowers
[单项选择]The（）is fitted in the main steam supply line and is usually of the non-return type.
A. main steam stop valve
B. auxiliary steam stop valve
C. feed check or control valve
D. blow down valve
[单项选择]The steam boiler is part of a closed loop steam, whereby, after the energy of the steam is used up and it becomes water again, （） is collected and returned back to the boiler for heating up again to steam.
A. the former
B. the first
C. the latter
D. the last
[单项选择]The remaining oil in the lubricating pipes and ducts should be blown out with （）.
A. atmosphere
B. the fresh water
C. compressed air
D. chemical compounds
[单项选择]The lubricating pipes and dusts should be blown out with （）.
A. atmosphere
B. the fresh water
C. compressed air
D. chemical compounds
[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]Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.
A. excessive crankcase pressure
B. excessive lube oil temperature
C. contamination of the lube oil by water
D. contamination of the cooling water by lube oil
[单项选择]Steam smoke will occur when（）.
A. Extremely cold air from shore passes over warmer water
B. Warm dry air from shore passes over cooler water
C. Cold ocean water evaporates into warm air
D. Cool rain passes through a warm air mass
[单项选择]Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure （） the saturation temperature.
A. the more
B. the higher
C. the lower
D. the highest
[单项选择]The fuel pipes and ducts should be blown with （）.
A. atmosphere
B. the fresh water
C. compressed air
D. chemical compounds
[单项选择]Exhaust pipes for separate diesel engines can be combined only when （）
A. space limitations prevent separately run pipes
B. the engines are small auxiliary units
C. they are arranged to prevent gas backflow to each engine
D. a waste heat boiler is installed
[单项选择]The steam coils in a high pressure evaporator used for saltwater service should be de-scaled with （）.
A. a needle gun
B. soap and water
C. a wire brush
D. a chipping hammer
[单项选择]The load between two steam-driven alternators operating in parallel may be adjusted by varying （）
A. the speed of the alternators
B. the field strength of the machines
C. the power factor of the alternators
D. steam supply to the prime movers
[单项选择]What is an advantage of diesel over steam turbine propulsion? （）
A. Less fuel consumption per SHP
B. Diesel fuel costs less than bunker C or its equivalent
C. Less routine maintenance required
D. Less weight per SHP
[单项选择]Before starting a reciprocating, steam-driven pump that has been idle for a period of time, you should （）.
A. open the steam line mot valve
B. drain the steam cylinder
C. close the steam cylinder drains
D. open the liquid cylinder drains
[单项选择]Pipes made of plastic are now widely used in building as they are light and do not become （）in water.
A. ripe
B. instant
C. rotten
D. mature
[单项选择]Large pipes or down-comers are fitted between the steam drum and （） to ensure good natural circulation of water.
A. fire-tubes
B. furnaces
C. water drums
D. water wall tubes
