更多"Cast iron carrier rings, （） machine"的相关试题:
[单项选择]Cast iron and gunmetal fittings are used freely in small sizes at moderate pressure; large fittings, those for high pressure and temperature are cast or mild steelIn the above sentence, the word “those” means （）.
A. east iron firings
B. mild steel fittings
C. small fittings
D. large fittings
[单项选择]Many cast iron pistons are designed with heat dams, which serve to （）
A. keep piston crown temperatures elevated for smoother combustion
B. reduce the possibility of overheating the top compression ring
C. help retain the heat of compression to prevent ignition delay
D. help retain the heat of compression to prevent combustion knock
[单项选择]"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.
A. east iron is a cheap material
B. cast iron can pollute sea water
C. cast iron has mere corrosive than bronzes to sea water
D. cast iron is more corrosive to sea water when it meets with bronzes
[单项选择]Cast iron pistons used in large propulsion diesel engines are constructed with （）
A. not taper what so ever
B. the skirt being tapered and smaller than the crown
C. the skirt being tapered and larger than the crown
D. the crown being tapered and smaller than the skirt
[单项选择]The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.
A. the connecting rod
B. the cross-head
C. the piston rod
D. the air box
[单项选择]The cast iron（）for the cross-head are attached to the top section and seal off the crankcase.
A. cylinder cover
B. cross-head shoes
C. guide-ways
D. scavenging boxes
[单项选择]（） of the A-frames there is a strong cast iron frame called the scavenging air box.
A. At the top
B. At the bottom
C. In the top
D. In the bottom
[单项选择]The piston ring grooves for a standard engine are （）
A. chromium-plate against wear
B. anti-corrosion treated
C. white metal lined against wear
D. flame hardened against wear
[单项选择]Worn out ring grooves should be （） to standard dimension after being welded.
A. machined
B. bored
C. honed
D. drilled
[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 main purpose of the piston oil scraper rings is to （）.
A. seal the space between the piston and the liner
B. reduce the amount of lube oil burned in the combustion chamber
C. transmit heat from the piston to the cylinder liner
D. damp out fluctuations of the piston side thrust
[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 purpose of the wearing rings used in a centrifugal pump is to （）.
A. prevent an internal explosion in the pump when it is overheated
B. enable a visual inspection of the pump while it is running
C. insure a proper alignment of the pump coupling to the driver
D. accommodate for friction between the impeller and the easing
[单项选择]These piston rings are so badly worn that they must be （）.
A. renewed
B. welded
C. machined
D. chromium-plated
[单项选择]What is the function of wearing rings found on some centrifugal pumps? （）
A. Absorb erosion of high velocity discharge stream
B. Seal pump shaft against entry of air
C. Isolate the outlet side from the inlet side
D. Dampen the turbulent discharge flow
[单项选择]One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.
A. maintain radial alignment between the pump impeller and casing
B. absorb all impeller shaft end thrust
C. prevent water leakage to the atmosphere
D. prevent wear of the pump casing and/or impeller
[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]Large quantities of uncovered pig iron or billets should not be carried in the upper-tween decks because（）.
A. this does not eliminate the risk of cargo shifting
B. this will increase the metacentric height of the ship
C. this will decrease the gravity height of the ship
D. this will reduce the rolling period of the ship
[单项选择]Wrought iron has an inherent resistance to corrosion but is not to be had freely , its place has been taken by the cuprous alloysAccording to the above sentence , which of the following statements is true?（）
A. Wrought iron can resist liquids flow
B. It is difficult to attain the wrought iron
C. Wrought iron should be combined with cuprous alloys
D. The cuprous alloys have mere disadvantages than wrought iron
