更多"The sealing rings are in four parts"的相关试题:
[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]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]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]With four-stroke engines, it takes four revolutions of the crank shaft to make （） power stroke(s).
A. 1
B. 2
C. 4
D. 8
[单项选择]Broken piston rings manifest themselves during the scavenge port inspection by（）
A. Lack of elastic tension, when the rings are pressed into the groove by means of a stick
B. Blackish appearance
C. Fractured rings and missing rings
D. all off the above
[单项选择]Sealing in pump shaft is achieved by means of the （）.
A. gasket
B. packing
C. washer
D. spring
[单项选择]The piston rings are manufactured with a diameter （） the bore of the cylinder.
A. larger than
B. smaller than
C. equal to
D. none of the above
[单项选择]Improperly fitted piston rings in a diesel engine can cause（）
A. excessive lube oil consumption
B. lower than normal lube oil temperature
C. higher than normal exhaust back pressure
D. excessive crankshaft end play
[单项选择]When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）
A. insufficient lubrication
B. improper piston cooling
C. blow-by
D. overload operation
[单项选择]The function of the piston compression rings used in a diesel engine is to （）
A. seal the space between the piston and liner
B. transmit heat from the piston to the cylinder liner
C. reduce the amount of combustion gas blow-by
D. all of the above
[单项选择]If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）
A. excessive ring action
B. excessive ring temperature
C. improper ring rotation
D. excessive ring face wear
[单项选择]All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.
A. the running-in period
B. the running process
C. gas exchange process
D. the boiler firing
[单项选择]Top piston rings are plasma coatedIt gives added safety for the of new lines（）
A. running-in
B. running-out
C. running on
D. running down
[单项选择]Piston compression rings used in a diesel engine function to （）
A. transfer heat from the cylinder to the piston
B. scrape oil from the sides of the piston
C. seal the combustion space from the crankcases
D. prevent any piston contact with the cylinder liner
