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 comes to normal, the drum pressure will and water level in the drum will（）.
A. rise, rise also
B. rise, drop
C. drop, rise
D. drop, drop also
[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]Opposition occurs when（）.
A. the Sun，Earth，and Moon are at right angles
B. the Sun's declination is 0°and is moving south
C. an inferior planet is at the maximum angle to the line of sight to the Sun
D. the Earth is between a planet and the Sun
[单项选择]Superior conjunction occurs when（）.
A. the Sun is at maximum declination north or south
B. a planet crosses the external plane of the ecliptic
C. the Sun is between the Earth and a planet
D. two planets are in line
[单项选择]Critical speed in diesel engines occurs when engine torque pulsations become （）
A. opposed to the crankshaft rocking couple
B. resonant with the crankshaft natural frequency
C. critical fore and aft crankshaft vibrations
D. horizontal whipping motions of the crankshaft
[单项选择]What generally occurs when the land is cooler than the nearby water? （）
A. A land breeze
B. A sea breeze
C. A norther
D. A prevailing westerly
[单项选择]The process that occurs when heat is generated by a chemical reaction within a substance and continues to a point of ignition is known as （）.
A. chemical ignition
B. spontaneous combustion
C. chemical combustion
D. radiation ignition
[单项选择]What occurs when rising air cools the dew point?（）
A. advection fog forms
B. humidity decrease
C. wind increase
D. Cloud form
[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]The greatest effect on stability occurs from loose liquids flowing（）.
A. from side to side in the tanks of the vessel
B. from fore to aft in the tanks of a vessel
C. in and out of a vessel that is holed in a wing tank
D. in and out of a vessel that is holed in a peak tank
[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]Gas turbines differ from steam turbines in that （）.
A. steam rather than gas is used to turn a shaft
B. vapor rather than gas is used to turn a shaft
C. the former uses gas to turn a shaft
D. the latter uses gas to turn a shaft
[单项选择]EXCEPT when suffering from a head or chest injury a patient in shock should be placed in which position?（）.
A. Head up and feet down
B. Head down and feet up
C. Flat on back with head and feet elevated
D. Arms above the head
[单项选择]When viewed from astern, if the propeller revolves in a clockwise direction when going ahead, it is known as （）.
A. ahead direction
B. astern direction
C. right-handed
D. left-handed
[单项选择]When transferring survivors from an enclosed lifeboat to a rescue vessel，personnel on board the boat should（）.
A. remove their life preservers to make it easier to climb on board the rescue vessel
B. climb on top of the boat while waiting for their turn to transfer to the rescue vessel
C. remain seated inside and make the transfer one person at a time
D. enter the water and swim over to the rescue vessel
