更多"When a sudden increase in steam dem"的相关试题:
[单项选择]When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）
A. rise quickly
B. rise slowly
C. drop quickly
D. drop slowly
[单项选择]The boiler is fired （） the demand for steam exceeds that available from exhaust gas heating.
A. whenever
B. however
C. wherever
D. whether
[单项选择]The amount of heat released by steam when it changes to water at the same temperature is called（）.
A. latent heat of condensation
B. latent heat of vaporization
C. latent heat of saturation
D. sensible heat of condensation
[单项选择]An explosion is a sudden increase in amount（）
A. rapid burning causes it
B. to be cause dby rapid burning
C. causing it'burningtoberapid
D. caused by rapid burning
[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]When steam is being raised on a boiler, the water level will normally （）.
A. drop as the boiler warms up
B. rise as the boiler warms up
C. remain unchanged until the boiler is hot enough
D. rise and fall with the steam demand
[单项选择]When the refrigeration demand is small,（）
A. the expansion valve will move toward the wide open position
B. the expansion valve will move toward the closing position
C. the feeler bulb will conveys the high temperature
D. the superheat degree will raise
[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]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]James Watt（）the steam engine.
A. was inventing
B. invented
C. had invented
D. has invented
[单项选择]The engine（）smoke and steam.
A. gives up
B. gives away
C. gives in
D. gives off
[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]Which of the listed types steam traps operates on the principle that hot water flashes to steam when its vapor pressure is rapidly reduced?（）
A. Ball float
B. Thermostatic
C. Bimetallic
D. Impulse
[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
