更多"Energy loses （）friction occurs in e"的相关试题:
[单项选择]Energy losses due to （） occur in every machine.
A. speed
B. friction
C. impact
D. atmosphere
[单项选择]The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
A. specific gravity
B. viscosity
C. S E number
D. hydrolytic stability
[名词解释]摩擦成本法（Friction cost approach）
[单项选择]Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to （）.
A. react with insufficient speed droop
B. fail to react to small speed changes
C. have excessive sensitivity to small speed changes
D. remain in the neutral position
[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]What will NOT increase friction of a liquid flowing in a pipe and cause a loss of suction head?（）.
A. Bends in the piping
B. Slowing the pumping rate
C. Pipeline valves
D. Backing rings for pipe welds
[单项选择]Neglecting friction, you desire to life a 300 kgs weight with a stress on the hauling part of 100kgs.Which of the following tackles would you use ?（）.
A. Gun tackle
B. Luff tackle
C. Toe-fold tackle
D. Double-luff tackle
[单项选择]Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.
A. acidity of the oil
B. pour point of the oil
C. flash point of the oil
D. viscosity of the oil
[单项选择]Any friction fit, tightness or adhesion of the part of any load being lifted should be broken by wedge or tapping and not by increasing the load on the applianceAccording to this sentence, （）
A. the lifting appliance can always lift the freight within its rated load
B. attention should be paid in order not to break the wedge when lifting cargo
C. sometimes the lifting work needs other assistance other than the lifting appliance
D. lifting work should be done with every part fit, tightness or adhesion
[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]Neglecting friction，you desire to lift a 300 kgs weight with a stress on the hauling part of 100 kgs.Which of the following tackles would you use?（）.
A. Gun tackle
B. Luff tackle
C. Two-fold tackle
D. Double-luff tackle
[单项选择]The pipe friction and the resistance will （） as a result of an increase in the amount of fluid flowing through the system.
A. reduce
B. rise
C. raise
D. fall
[单项选择]Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because （）.
A. the distillate produced has greater purity
B. no boiling occurs on heat transfer surfaces
C. evaporation occurs at a higher rate
D. the incoming feed is at a higher temperature
[单项选择]Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
A. Exhaust and scavenging
B. Scavenging and compression
C. Ignition and expansion
D. Exhaust and compression
[单项选择]Priming of the tides occurs（）.
A. at times of new and full Moon
B. when the Earth，Moon，and Sun are lying approximately on the same line
C. when the Moon is between first quarter and full and between third quarter and new
D. when the Moon is between new and first quarter and between full and third quarter
[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]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
