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【单选题】
带传动中,两带轮与带的摩擦系数系统相同,直径不等,如有打滑则先发生在______轮上。A.
大
B.
小
C.
两带
D.
不一定哪个
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【单选题】Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires___________.
A.
grinding the spare plunger to the barrel
B.
replacing the plunger and the barrel
C.
highly polishing both the plunger and barrel
D.
replacing plunger only
【单选题】Because of the close tolerances used In diesel engine fuel oil pumps,a worn plunger requires ____.
A.
grinding the spare plunger to the barrel
B.
replacing the plunger and the barrel
C.
highly polishing both the plunger and barrel
D.
replacing plunger only
【单选题】When the follower is on the base circle of the cam, the pump plunger is at the _____ of its stroke.
A.
top
B.
middle
C.
bottom
D.
any of the above
【单选题】The amount of fuel delivered by a helical plunger fuel injection pump is controlled by ____.
A.
varying the pump discharge pressure
B.
varying the pump return pressure
C.
rotation of the pump plunger
D.
rotation of the pump barrel
【单选题】Which of the following will of the spiral, on the plunger of a jerk pump, uncovers the spill port?
A.
The plunger immediately reverses direction
B.
The pressure drops and fuel delivery stops
C.
The plunger rotates to the no fuel position
D.
The barrel rotates to the zero effective stroke position
【简答题】有一稳态导热的平壁炉墙,墙厚 240mm ,导热系数 λ = 0.2W/m ∙ K ,若炉墙外壁温度为 45°C ,为测得炉墙内壁温度,在由外壁向墙内 100mm 处插入温度计,测得该处温度 100°C ,试求炉墙内壁温度。
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