更多"The four-stroke cycle begins with t"的相关试题:
[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]In a four-cycle diesel engine piston blow-by can result in increased()
A. crankcase pressure
B. compression pressure
C. scavenge pressure
D. exhaust manifold pressure
[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]Abnormal crankpin bearing and piston skirt surface wear indicate()
A. a restricted air intake
B. a clogged connecting rod oil passage
C. incorrect connecting rod alignment
D. high cylinder firing temperatures
[单项选择]Piston cooling fins are located()
A. atop the piston crown
B. beneath the piston crown
C. at the base of the piston skirt
D. inside the cylinder liner cooling water jacket
[单项选择]Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to()
A. jam in the most worn part of the cylinder when the rings expand
B. break in the most worn part of the cylinder when the rings expand
C. wear eccentrically on the side opposite the end gap
D. overheat and jam at the top center on the combustion stroke
[单项选择]Broken piston rings manifest themselves during the scavenge port inspection by()
A. Lack of elastic tension, when the rings are pressed into the groove by means of a stick
B. Blackish appearance
C. Fractured rings and missing rings
D. all off the above
[单项选择]The function of diesel engine piston compression rings is to ().
A. prevent piston side thrust
B. prevent engine friction losses
C. transmit heat from the piston to the cylinder liner
D. remove oil from the cylinder combustion space
[单项选择]The piston supporting body is mainly subjected to () stress.
A. pushing
B. centrifugal
C. stretch
D. compressive
[单项选择]The piston rings are manufactured with a diameter () the bore of the cylinder.
A. larger than
B. smaller than
C. equal to
D. none of the above
[单项选择]When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of ()
A. insufficient lubrication
B. improper piston cooling
C. blow-by
D. overload operation
[单项选择]Improperly fitted piston rings in a diesel engine can cause()
A. excessive lube oil consumption
B. lower than normal lube oil temperature
C. higher than normal exhaust back pressure
D. excessive crankshaft end play
[单项选择]Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which()
A. has a crown-face
B. exceeds wear limits through normal wear
C. has excessive blow-by
D. is in good condition
[单项选择]In a fixed displacement axial piston hydraulic motor, the speed is varied by()
A. regulating the ratio between torque and speed via the torque limiter at the motor
B. directing the motor output flow through a bypass line
C. maintaining a constant flow and pressure input
D. controlling the input flow rate
[单项选择]
A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring()
Ⅰ.gap
Ⅱ.side
A. Ⅰonly
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰ nor Ⅱ
[单项选择]The piston cooling system may employ similar components, except that () is used instead of a head tank.
A. a sump tank
B. a feed well
C. a double bottom tank
D. a drain tank