更多"The amount of fluid delivered by a "的相关试题:
[单项选择]The amount of fluid delivered by a positive displacement pump can be regulated by （）.
A. throttling the pressure line
B. changing the speed of the driving rotor
C. either A or B
D. None of the above is tree
[单项选择]The amount of fluid delivered by a centrifugal pump can be regulated by （）.
A. throttling the pressure line
B. changing the speed of the rotor
C. either A or B
D. None of the above is tree
[单项选择]The amount of fluid delivered by a gear pump can be regulated by （）.
A. throttling the pressure line
B. changing the speed of the rotor
C. either A or B
D. None of the above is true
[单项选择]The amount of fluid delivered by a helical pump can be regulated by （）.
A. throttling the pressure line
B. changing the speed of the rotor
C. either A or B
D. None of the above is tree
[单项选择]The amount of fluid delivered by a screw pump can be regulated by （）.
A. throttling the pressure line
B. changing the speed of the rotor
C. either A or B
D. None of the above is tree
[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
[单项选择]The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）
A. varying the pump discharge pressure
B. varying the pump return pressure
C. rotation of the pump plunger
D. rotation of the pump barrel
[单项选择]The amount of fuel delivered by a unit injector is controlled by the （）
A. camshaft
B. main spring
C. rack position
D. nozzle orifice size
[单项选择]The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load.Which of the following statements describes this requirement?（）
A. Proper timing
B. Accurate metering
C. Suitable injection rate
D. Suitable atomization rate
[单项选择]Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.
A. using a slightly dirty air filter
B. using oil having an excessive viscosity
C. intercooler or after-cooler leaks
D. carrying the oil level higher than normal
[单项选择]A reciprocating air compressor is running roughly and vibrating excessively, indicating that the （）.
A. compressor is overloaded
B. motor is overloaded
C. foundation bolts are loose
D. belts are too tight
[单项选择]Bad valves operation of the reciprocating air compressors can be detected by observation of （）.
A. the discharge temperature low
B. the discharge temperature high
C. the discharge pressure rise
D. the inter-stage pressure low
[单项选择]Air chambers are usually fitted to reciprocating pumps in order to （）.
A. increase discharge pressure
B. increase suction vacuum
C. develop pulsation flow
D. keep a steady rate of flow
[单项选择]If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
A. the relief valve should open before the high pressure cutout
B. the relief valve should open and allow the excess refrigerant to flow to the receiver
C. the high pressure cutout switch should operate before the relief valve opens
D. you should close in on the suction valve
[单项选择]When starting a reciprocating pump, the inlet valve should be （）.
A. closed
B. opened fully
C. cracked open
D. partly open
[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]If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.
A. misalignment or worn main bearings
B. insufficient cylinder lubrication
C. defective or poorly fitted valves
D. all of the above
[单项选择]To reduce the weight of the reciprocating parts, pistons of high-speed engines are made considerably shorterThis results in （）
A. less piston slap and quieter running
B. increased crankshaft bearing wear
C. slightly greater piston wear
D. decreased side pressures
[单项选择]A reciprocating pump belongs to （） according to its working principle.
A. injector pumps
B. positive displacement pumps
C. centrifugal pump
D. centripetal pumps
