更多"Cross scavenging requires the fitti"的相关试题:
[单项选择]Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the （）.
A. air charge density becoming too high
B. piston crown surfaces becoming too cold
C. formation of excessive quantities of condensate
D. compression pressure being greatly reduced
[单项选择]The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）
A. direction of air flow within the cylinder
B. sequence of port opening
C. method of opening exhaust ports
D. volume of air admitted to the cylinder
[单项选择]The term diesel engine scavenging means（）
A. delivering more air into the cylinder than it would normally receive during an ordinary charging process
B. forcing the products of combustion out of the cylinder with the fresh air charge
C. collecting the air charge at the cleaner
D. combustion and expansion of hot gas
[单项选择]Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.
A. during the valve overlap period
B. with only the exhaust valve open
C. at a pressure below atmospheric
D. without cooling the cylinders or pistons
[单项选择]In which of the scavenging methods listed will the exhaust valve be located in the cylinder head?（）
A. Return-flow
B. Uniflow
C. Cross-flow
D. Direct flow
[单项选择]Air scavenging of a diesel engine cylinder（）
A. blows out the exhaust gases
B. supplies oxygen for combustion
C. cools the valves and cylinder walls
D. all of the above
[单项选择]The scavenging box is built of a number of sections provided with vertical flanges enabling them （） together to form two blocks.
A. being bolted
B. bolted
C. bolting
D. to be bolted
[单项选择]The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.
A. so a height
B. such a height
C. so high
D. such high
[单项选择]On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）
A. cooling jacket
B. cylinder liner
C. piston crown
D. cylinder cover
[单项选择]Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）
A. during the valve overlap period
B. with only the exhaust valve open
C. at a pressure below atmospheric
D. without cooling the cylinders or pistons
[单项选择]The process of scavenging a two-stroke/cycle diesel engine serves to（）
A. improve fuel flow volume
B. cool the exhaust valves
C. reduce the intake air charge density
D. increase the temperature of exhaust gases
[单项选择]Scavenging in a four-stroke/cycle diesel engine occurs during the （）.
A. last part of the exhaust stroke, and the first part of the intake stroke
B. last part of the intake stroke only
C. early part of the injection stroke only
D. early part of the power stroke
[单项选择]"Scavenging" on a diesel engine means （）.
A. injecting fuel oil into a cylinder
B. removing exhaust gases from the cylinder
C. forcing air into the cylinders under pressure after the exhaust valve has dosed
D. a combination of all the above
[单项选择]Scavenging is （） of exhaust gases by blowing in fresh air.
A. the suction
B. the compression
C. the removal
D. the deliver
[单项选择]What fitting on the mast works in conjunction with the shrouds to control side bend of the mast?（）
A. Chainplate
B. Hound
C. Crowfoot
D. Spreader
[单项选择]A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a（）.
A. blind flange
B. pivot coupling
C. quick-release coupling
D. spectacle flange
[单项选择]The fitting of an efficient radar reflector is likely to considerably increase the ship’s probability of（）.
A. detection
B. being detected
C. the detective
D. the detected
[单项选择]What purpose does a bridge fitting serve when lashing containers?（）.
A. Ties a container stack to the deck
B. Ties a container to the container below it
C. Restrains racking loads
D. Restrains the container against horizontal motion
