单选题Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）A less even torqueB higher cylinder head temperaturesC fewer power strokes per revolutionD greater weight/size requirements

题目
单选题
Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）
A

less even torque

B

higher cylinder head temperatures

C

fewer power strokes per revolution

D

greater weight/size requirements

相似考题

1.Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.A.The direction of pressure on the journal in four-stroke engine is continuouslyB.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engineC.four-stroke engines usually utilize a heavier grade of oil than tow-stroke enginesD.Low-stroke engines usually consume less lube oil than four-stroke engines

2.The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.A.fed from mechanical lubricatorsB.thrown off from the main bearingsC.supplied from wick fed drip lubricatorsD.flow from a centrifugal or banjo oiler

3.单选题In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）A wide compression rings are usedB oil rings are located above the pistonC chromium plating is used on all piston ringsD oil rings are located near the bottom of the piston skirt

4.If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two stroke/cycle diesel engine will develop approximatelyA.the same indicated horsepower as a four-stroke/cycle engineB.twice the indicated horsepower as a four-stroke/cycle engineC.one half the indicated horsepower as a four-stroke/cycle engineD.one power stroke for every two crankshaft revolutions

更多“Compared to four-stroke/cycle engines, two-stroke/cycle dies”相关问题

  • 第1题：

    单选题
    The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）
    A

    one half crankshaft speed in a two-stroke cycle diesel engine

    B

    crankshaft speed in a two-stroke cycle diesel engine

    C

    two times crankshaft speed in a two-stroke cycle diesel engine

    D

    one-fourth times crankshaft speed in a four-stroke cycle diesel engine


    正确答案： A
    解析： 暂无解析

  • 第2题：

    单选题
    The two-stroke cycle begins with the piston coming up from the BDC, with the scavenging ports in the sides of the cylinders being （）.
    A

    open

    B

    uncover

    C

    covered

    D

    closed


    正确答案： C
    解析： 暂无解析

  • 第3题：

    单选题
    The size of the exhaust valve opening is （）
    A

    most critical in a four-stroke cycle diesel engine

    B

    most critical in a two-stroke/cycle diesel engine

    C

    most critical in a four-stroke/cycle diesel engine if it is turbocharged

    D

    of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine


    正确答案： A
    解析： 暂无解析

  • 第4题：

    单选题
    Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.
    A

    The direction of pressure on the journal in four-stroke engine is continuously

    B

    positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine

    C

    four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines

    D

    Low-stroke engines usually consume less lube oil than four-stroke engines


    正确答案： B
    解析： 暂无解析

  • 第5题：

    单选题
    Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）
    A

    bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversed

    B

    bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversed

    C

    the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine

    D

    two-stoke/cycle diesel engines require more complicated lubrication piping


    正确答案： B
    解析： 暂无解析

  • 第6题：

    单选题
    In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.
    A

    two crankshaft revolutions in a two-stroke/cycle engine

    B

    two power strokes in a two-stroke/cycle engine

    C

    one power stroke in a two-stroke/cycle engine

    D

    two piston strokes in a two-stroke/cycle engine


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two-stroke/cycle diesel engine will develop approximately（）
    A

    the same indicated horsepower as a four-stroke/cycle engine

    B

    twice the indicated horsepower as a four-stroke/cycle engine

    C

    one half indicated horsepower as a four-stroke/cycle engine

    D

    one power stroke for every two crankshaft revolutions


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    The two strokes of a two-stroke/cycle diesel engine are （）
    A

    power and intake

    B

    intake and exhaust

    C

    exhaust and compression

    D

    compression and power


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.
    A

    it has a longer power stroke

    B

    more air gets into the cylinder each stroke

    C

    it develops twice as many power strokes at the same speed

    D

    higher combustion pressure is developed


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.
    A

    temperature of the exhaust gases

    B

    energy supplied to the turbocharger

    C

    air pressure to the intake manifold

    D

    purge of exhausted gases from the cylinders


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    The camshaft on a four-stroke/cycle diesel engine provides a means to operate the （）.
    A

    fuel injectors

    B

    exhaust valves

    C

    intake valves

    D

    all of the above


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    A piston in a four-stroke/cycle diesel engine makes four strokes during each （）.
    A

    crankshaft revolution

    B

    mechanical cycle of operation

    C

    period of two combustion cycles

    D

    cycle of two events


    正确答案： B
    解析： 暂无解析

  • 第13题：

    单选题
    The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.
    A

    shut

    B

    closing

    C

    opened

    D

    closed


    正确答案： A
    解析： 暂无解析

  • 第14题：

    单选题
    The reversing cams of some four-stroke/cycle diesel engines are brought into position by （）
    A

    sliding the camshaft along its axis

    B

    rotating the cam 180

    C

    rotating the cam followers 180

    D

    moving the idler sprockets in the drive chain


    正确答案： C
    解析： 暂无解析

  • 第15题：

    单选题
    Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
    A

    Exhaust and scavenging

    B

    Scavenging and compression

    C

    Ignition and expansion

    D

    Exhaust and compression


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    In comparing engines of equal horsepower, higher exhaust gas temperatures occur in a/an（）
    A

    opposed-piston engine

    B

    double-acting engine

    C

    two-stroke/cycle engine

    D

    four-stroke/cycle engine


    正确答案： A
    解析： 暂无解析

  • 第17题：

    单选题
    Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）
    A

    increase the liner area covered by the oil film

    B

    maintain an oil film on the lower liner where scuffing is prevalent

    C

    keep excess oil away from intake and exhaust ports

    D

    help cushion piston skirt side thrust by providing a hydrodynamic oil wedge


    正确答案： C
    解析： 暂无解析

  • 第18题：

    单选题
    Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）
    A

    In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater

    B

    Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports

    C

    No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine

    D

    The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine


    正确答案： A
    解析： 暂无解析

  • 第19题：

    单选题
    A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）
    A

    has little or no internal friction

    B

    has a lower effective compression ratio

    C

    operates with scavenge air under a positive pressure

    D

    operates without energy absorbing intake and exhaust strokes


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the （）.
    A

    intake stroke

    B

    exhaust stroke

    C

    power stroke

    D

    compression stroke


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    The purpose of the skirt or trunk in four-stroke cycle engines is to act in a similar manner to a （）.
    A

    crosshead

    B

    crown

    C

    piston rod

    D

    connecting rod


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.
    A

    improving cylinder scavenging

    B

    preheating the combustion chamber

    C

    reducing air charge density

    D

    preventing valve wear


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer
    A

    (1) only

    B

    (2) only

    C

    both (1) and (2)

    D

    neither (1) nor (2)


    正确答案： D
    解析： 暂无解析

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