更多"What is the purpose of the intake/e"的相关试题:
[单项选择]In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.
A. the beveled edges of the intake valves provide for serf-centering during seating
B. intake valves utilize stellite-coated valve seat inserts which reduce wear
C. the volume of air passing through intake valves is less than the volume of air passing through exhaust valves
D. intake valves are less affected to the corrosive action of exhaust gases
[单项选择]The intake valves in a diesel engine are reseated by （）.
A. cam followers
B. push rods
C. combustion gases
D. valve springs
[单项选择]What is the effect of heated intake air on a diesel engine? （）
A. Increases efficiency
B. Increases engine horsepower
C. Increases engine life
D. Reduces engine horsepower
[单项选择]What is TRUE of pressure/vacuum valves? （）
A. They are designed to provide for the flow of small volumes of tank atmospheres caused by thermal variations in a cargo tank
B. They should operate in advance of the pressure/vacuum breakers
C. They should be kept in good working order by regular inspection and cleaning
D. All of the above
[单项选择]Which of the valves listed should be used either in the fully opened or the fully closed position?（）
A. A gate valve
B. A globe valve
C. Any check valve
D. Any needle valve
[单项选择]A pair of spectacles（）what I need at the moment.
A. is
B. are
C. has
D. have
[单项选择]What can I do for you, sir?（）
A. Can you lend me some money?
B. Nothing.
C. I want a pair of shoes.
D. Whatever
[单项选择]What can I do for you, madam?（）
A. Thank you.
B. You can't help me.
C. I want to buy a camera.
D. I'm glad to hear that
[单项选择]— What can I do for you? —（）
A. I want a kilo of pears.
B. You can do in your own way.
C. Thanks.
D. Excuseme.I’m busy.
[单项选择]What a fool I have been! Why（）I think of that before?
A. don’t
B. didn’t
C. not
D. do
[单项选择]What time can I（）the canal?
A. enter
B. enter in
C. enter to
D. enter into
[单项选择]I'd like to know what you（）the plants I gave you.
A. made for
B. dealt with
C. live on
D. did with
[单项选择]I don't think I'm late. Excuse me, what's the time? （）
A. It says 8:00. But it‘s 5 minutes slow.
B. I‘m sorry I‘ve forgot the time.
C. I was caught in the traffic jam.
D. I‘m sorry to keep you waiting.
[单项选择]What happens to the efficiency of an anchor when it is moved from sand to mud?（）
A. The efficiency increases
B. The efficiency decreases
C. The efficiency remains the same
D. The efficiency cannot be determined.
[单项选择]Intake air flow from a diesel engine turbocharger is directly proportional to engine（）
A. exhaust gas pressure
B. exhaust gas temperature
C. speed
D. load
[单项选择]Worn diesel engine intake valve guides can result in （）
A. increased engine breathing efficiency
B. excessive valve lash
C. excessive lube oil consumption
D. lower than normal fuel consumption
[单项选择]Directional intake ports in diesel engines are used to （）.
A. reduce air charge turbulence
B. induce air swirl
C. deflect hot combustion gas away from the valves
D. oppose the effects of piston induced squish
[单项选择]Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A. double bottom fuel oil tank temperature
B. heater supply steam flow
C. pressure of the fuel supplied to the burners
D. attemperator steam flow in the heater discharge circuit
