更多"（） are more suitable for large quan"的相关试题:
[单项选择]In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）
A. build up the piston crown by metal spraying
B. build up the cylinder head by metal spraying
C. insert shims between the crankpin bearing box and the connecting rod foot
D. install a thinner head gasket
[单项选择]In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）
A. top of the ring groove
B. back of the ring groove
C. bottom of the ring groove
D. piston ring end clearance
[单项选择]A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.
A. cylinder heads
B. exhaust valves
C. scavenging air
D. injectors
[单项选择]Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）
A. decrease the time required between cleanings
B. removes all large and small foreign objects
C. ensure a positive flow of oil at all times
D. ensure that all lube oil has been treated twice
[单项选择]A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）
A. low TBN value
B. high alkaline reserve
C. low flash point
D. high pour point
[单项选择]When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）
A. The diesel oil must never be allowed to mix with the heavy fuel
B. The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valve
C. The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valve
D. The heating steam must be secured before the diesel oil passes through the three-way valve
[单项选择]In order to start a large, low-speed, main propulsion diesel engine on high viscosity fuel after an extended shutdown, the （）
A. fuel must be preheated
B. intake air should be preheated
C. lube oil outlet temperature should be increased 20℃ above normal
D. none of 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]Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （）
A. increasing the quantity of starting air
B. increasing the lube oil pressure
C. heating the engine fuel supply
D. heating the engine coolant
[单项选择]In the Sargasso Sea there are large quantities of seaweed and no well defined currents. This area is located in the（）.
A. Central North Atlantic Ocean
B. Caribbean Sea
C. Western North Pacific Ocean
D. area off the west coast of South America
[单项选择]On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）
A. dial indicator
B. outside caliper
C. bridge gauge
D. tram rod
[单项选择]Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.
A. fuel oil vapor at the sludge tank vent
B. unburned fuel vapors in the scavenge air receiver
C. lube oil vapors in the crank case
D. lube oil vapors in the engine room
[单项选择]A fluid coil will （）large quantities of heat when it changes state from a liquid to a vapor.
A. release
B. absorb
C. develop
D. regenerate
[单项选择]The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is （）.
A. they operate between 150 and 450 rpm
B. they are connected to the propeller by gearing
C. their smaller size and weight
D. they can be connected directly to the propeller without gearing
[单项选择]Which of the following is more suitable for bagged cargo?（）.
A. Hydraulically operated pusher
B. Spread beam sling
C. Revolving roll clamping device
D. Platform sling
[单项选择]Smaller engines can be made more rigid than large ones and may not have （）.
A. connecting rods
B. crankshaft
C. crankcase
D. through bolts
[单项选择]Small quantities of flammable liquids needed at a work site should be（）.
A. used only under the supervision and direction of a ship's officer
B. tightly capped and stowed with other tools near the job site when securing at the end of the day
C. used only when a pressurized fire hose is laid out ready for immediate use
D. in a metal container with a tight cap
