更多"Generally speaking, suction heads r"的相关试题:
[单项选择]Generally speaking , the heavier cargo will go into the（）,distributing it evenly fore and aft, the lighter cargo will probably be placed in the（）.
A. deep tanks/lower holds
B. lower holds/tweendecks
C. tweendecks/deep tanks
D. deep tanks/tweendecks
[单项选择]Generally speaking，in the Northern Hemisphere，when winds are blowing from between SE and SW the barometric reading（）.
A. makes no change at all
B. is somewhat lower than it would be for winds from a northern quadrant
C. is uncertain and may fluctuate by increasing and decreasing
D. is somewhat higher than it would be for winds from the northern quadrant
[单项选择]Generally speaking，the most favorable bottom for anchoring is（）.
A. Very soft mud
B. Rocky
C. A mixture of mud and clay
D. Loose sand
[单项选择]Generally speaking，the heavier cargo will go into the（），distributing it evenly fore and aft，the lighter cargo will probably be placed in the（）.
A. deep tanks／lower holds
B. lower holds／tweendecks
C. tweendecks／deep tanks
D. deep tanks／tweendecks
[单项选择]Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.
A. spark plugs
B. glow plugs
C. heat of compression
D. a magneto
[单项选择]Generally speaking，a ship steaming across the North Pacific from Japan to Seattle is likely to experience（）.
A. adverse currents for practically the entire crossing
B. favorable currents for practically the entire crossing
C. favorable currents in the summer months and adverse currents in the winter months
D. variable currents having no significant effect on the total steaming time
[单项选择]Generally speaking，you should expect to find low atmospheric pressure prevailing in the earth’s（）.
A. equatorial area
B. polar regions
C. mid-latitudes
D. All of the above
[单项选择]Generally speaking，with（）the weather becomes cloudy or overcast with strong winds.
A. high pressures
B. low pressures
C. weak pressures
D. strong pressures
[单项选择]Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.
A. one size smaller than the pump suction nozzle
B. the same size as the pump suction nozzle
C. one size larger than the pump suction nozzle
D. installed with a short radius elbow at the pump
[单项选择]The compressor suction line conveys the refrigerant vapor from （） to （）.
A. condenser；evaporator
B. evaporator；compressor
C. compressor；condenser
D. None of the above
[单项选择]If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A. refrigerant overcharge
B. overfeeding by the expansion valve
C. a restricted suction strainer
D. due to short cycling of the compressor
[单项选择]The emergency bilge suction or bilge injection valve is used to prevent （） of the ship.
A. proceeding
B. overloading
C. collision
D. flooding
[单项选择]The emergency bilge suction valve is typically used （）.
A. to inject cleaning additives when the bilges are extremely dirty
B. when the main condenser becomes fouled, in order to provide additional cooling water circulation
C. to connect the rose box to the independent bilge suction
D. if the bilges become flooded and they can not be emptied by any other means
[单项选择]A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.
A. have a greater head capacity
B. operate with increased impeller efficiency
C. discharge through the suction side of the pump casing
D. require more power to run the shaft
[单项选择]A warmer than normal compressor suction line might be caused by （）.
A. insufficient lubrication
B. insufficient refrigerant
C. excess refrigerant
D. excessive opening of the expansion valve
[单项选择]A simple pumping system consists of a suction branch, a pump and （）.
A. a priming device
B. a discharge branch
C. a filter
D. a suction valve
[单项选择]When operating with a negative suction head, which of the following types of pumps will require priming?（）
A. Reciprocating
B. Centrifugal
C. Rotary
D. Gear
[单项选择]It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong directionThis would cause the pump （）.
A. head capacity to improve
B. discharge to be reversed
C. efficiency to decrease
D. slippage to decrease
