更多"During working, when the piston is "的相关试题:
[单项选择]She has been working hard day and night during these years（）she could pay for the lost necklace.
A. in order that
B. as long as
C. the moment
D. because
[单项选择]A lifeboat is weight tested by lowering to near the waterand loading to capacity with weight evenly distributed. Itis then lowered into the water and released. This test mustbe done at least once every（）.
A. 6 months
B. 12 months
C. 18 months
D. 24 months
[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]If the piston ring gap remains insufficient when installing new rings, youshould（）
A. install oversized rings
B. hone the cylinder liner to allow ring installation
C. compress the rings tighter with a compressing tool
D. file the ends of the rings
[单项选择]
In a diesel engine, when refitting piston rings you should （）
Ⅰ.check the ring gap at the smallest diameter of the cylinder
Ⅱ. Remove carbon from the ring groove
A. Ⅰ only
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰ nor Ⅱ
[单项选择]
In a diesel engine, when installing new piston rings it is important to check（）
Ⅰ.ring gap clearance
Ⅱ.side clearance
A. Ⅰ only
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰnor Ⅱ
[单项选择]During working, thermostatic expansion valve should be （）.
A. either all the way open or all the way closed
B. normally fully open
C. throttled depending on load
D. controlled by liquefied pressure
[单项选择]How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?（）.
A. With gooseneck vents
B. With warning signs
C. With flame screens
D. With pressure-vacuum relief valves
[单项选择]When installing rings on a diesel engine piston, you should check the ring（）
A. diametrical tension
B. gap clearance
C. radial thickness
D. face thickness
[单项选择]A piston is at bottom dead center when it is（）
A. opening the exhaust ports
B. closing the fuel ports
C. farthest from the cylinder head
D. nearest to the cylinder head
[单项选择]The term flood current refers to that time when the water（）.
A. is flowing towards the land
B. is moving towards the ocean
C. level is not changing
D. level is rising because of heavy rains
[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]A piston is said to be at top dead center when it is （）
A. opening the exhaust ports
B. placed on top of the engine along its centerline
C. farthest from the cylinder head
D. nearest to the cylinder head
[单项选择]For a diesel engine, when the piston is at the （）, the clearance volume is the largest.
A. TDC
B. DTC
C. BDC
D. DBC
[单项选择]During working of an air compressor, （） should be drained.
A. inter cooler
B. cylinder
C. outlet pipe
D. inlet pipe
[单项选择]（）is a room on or near the bridge provided with the necessary fittings and furniture for the handling and stowage of charts and where the chronometers are placed.
A. Captain's cabin
B. Chief Officer's locker
C. Chartroom
D. Pilot's cabin
