更多"During which of the listed piston s"的相关试题:
[单项选择]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
[单项选择](Piston area)X(Piston stroke)K(numbers of the cylinders)=engine（）
A. brake horsepower
B. displacement
C. cylinder volume
D. cylinder clearance
[单项选择]During fueling operations, which of the listed precautions should be taken when topping off fuel tanks?（）
A. Reduce the pumping rate by closing the deck filling valve
B. Close all overflow valves
C. Place 5 gallon containers under all flange connections in the fuel line
D. Reduce the pumping rate and sound tanks frequently as the level rises
[单项选择]The four-stroke cycle begins with the piston （）.
A. coming up from the BDC
B. coming up from the TDC
C. coming down from the BDC
D. coming down from the TDC
[单项选择]On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it delivers power to the crankshaft through the （）.
A. thrust block
B. sounding rod
C. connecting rod
D. push rod
[单项选择]In a four stroke engine, which process lasts the longest period?（）
A. exhaust and suction process
B. suction and compression process
C. combustion and exhaust process
D. working and exhaust process
[单项选择]During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the（）
A. piston skirt
B. pinion
C. crosshead
D. compression rings
[单项选择]An axial piston, variable stroke pump is used in a vessels hydraulic steering gearUnder pressure, oil continually leaks out from between the valve plate/cylinder barrel and will（）.
A. cause loss of hydraulic oil from the system
B. result in extreme damage to the pump
C. cause damage to the pump ff not continually drained from the pump casing
D. result in the system high side pressure to substantially drop off
[单项选择]With four-stroke engines, it takes four revolutions of the crank shaft to make （） power stroke(s).
A. 1
B. 2
C. 4
D. 8
[单项选择]With reference to a radial piston pump, which one of the following statements is false?（）
A. Surrounding the fixed shaft is a hollow shaft
B. This hollow shaft carries radial bores
C. Each bore is fitted with a well-lapped plunger
D. There are always even numbers of bores
[单项选择]With reference to an axial piston pump, which one of the following statements is true?（）
A. The cylindrical barrel is coupled to the motor
B. The cylindrical barrel has an odd number of bores
C. The bores end in sockets
D. The sockets fit in the swash plate
[单项选择]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
[单项选择]During the suction stroke, the piston is moving （）.
A. inwards
B. outwards
C. downwards
D. upwards
[单项选择]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
[单项选择]According to the principle of four stroke diesel engine, what is the number of its efficient work stroke per revolution?（）
A. 1/2
B. 1
C. 2
D. 3
[单项选择]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
[单项选择]Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?（）
A. Stationary
B. Full floating
C. Semi-floating
D. Free rolling
[单项选择]For an ordinary modem marine four-stroke engine the inlet valves close （）.
A. after TDC
B. before TDC
C. after BDC
D. before BDC
