更多"Sealing in pump shaft is achieved b"的相关试题:
[单项选择]Shaft sealing in a centrifugal pump can be effected by （）.
A. the mechanical seal
B. packed stuffing boxes
C. either A or B
D. neither A nor B
[单项选择]Which pump is the self-priming pump?（）
A. turbine
B. centrifugal
C. ejector
D. mixed flow
[单项选择]The （）pump is usually used as the bilge feed pump to an oily water separator.
A. turbine
B. screw
C. vane
D. ejector
[单项选择]A （） pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.
A. injector
B. positive displacement
C. centrifugal
D. centripetal
[单项选择]A mixed-flow pump is a （） pump classified by the working principle.
A. self priming
B. positive displacement
C. reciprocating
D. impeller
[单项选择]The bearing of tailshaft sealing equipment, which adopting the oil nature circulation is hot, the reason is（）
A. the rotate speed fluctuation
B. the ventilation tube clogged
C. the main engine accelerate so fast
D. stormy waves
[单项选择]The tailshaft sealing arrangement found a little lube oil leaky and caused a lot of seawater into the bearing, the step should be taken as a makeshift is（）
A. dropping lube oil for lubrication, reducing the pollution to the sea
B. setting a temporary gravity oil tank and enhanced the position properly
C. lubricating with the used lube oil
D. lubricating with the fresh water and navigation in a lower speed
[单项选择]Setting a sealing equipment astern on the tailshaft can’t （）
A. prevent the seawater from intergrating
B. prevent the lube oil from running out of the outside aboard
C. strengthen the intencity of the sterntube
D. prevent the mud and sand from entering the lube oil system
[单项选择]A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）
A. combustion gas blow-by
B. excessive lubrication
C. properly functioning rings
D. insufficient cylinder cooling
[单项选择]Black areas on the sealing surfaces of piston rings indicate（）
A. lube oil pumping
B. rotating rings
C. gas pressure behind the ring
D. passage of hot gases
[单项选择]Some pumps use packing as sealing glandThe gland should be （）.
A. slack enough to allow slight leakage of fluid
B. slightly clocked
C. brought up tight so as not to allow any leakage
D. fitted with a relief valve
[单项选择]The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.
A. upwards；inwards
B. upwards；outwards
C. downwards；inwards
D. downwards；outwards
[单项选择]Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or （）.
A. inside micrometer
B. feeler gauge
C. adjustable trammel
D. sighting device
[单项选择]Turbocharging of marine diesel engine is achieved by two distinct methods, （） termed the constant pressure and the pulse system.
A. respectable
B. respectful
C. respective
D. respectively
[单项选择]The sealing rings are in four parts and pressed together around the piston rods by means of （）.
A. nuts
B. bolts
C. coil springs
D. stuffing boxes
[单项选择]The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.
A. wheel
B. crankshaft
C. running gear
D. cam
[单项选择]Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by（）
A. permanent loss of pump suction
B. worn shaft seals
C. high level in the oil sump
D. low motor RPM
[单项选择]Which is not the maintenance work for shaft bearings in transmission system?（）
A. check oil level in bearing sump
B. check them for leakagec through end seals
C. pump bilges in time
D. check temperature
