单项选择题In an auxiliary diesel engine, the reason for knurling the piston skirt is to()

A.improve skirt lubrication
B.allow for expansion
C.transmit forces evenly
D.improve the piston seal


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1.单项选择题Which of the listed design features is found in an exhaust valve and NOT in an intake valve?()

A.Hard alloy steel construction
B.Beveled edges on the valve head
C.Low alloy steel construction
D.Poppet type design

2.单项选择题A diesel engine cylinder head can crack as a result of ()

A.a leaking seal ring
B.heat transfer from exhaust valves
C.restricted cooling passages
D.overheated intake valves

3.单项选择题In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the()

A.top of the ring groove
B.back of the ring groove
C.bottom of the ring groove
D.piston ring end clearance

4.单项选择题Diesel engine blow-by is the leakage of combustion gases past the ()

A.oil rings only
B.compression and scraper rings
C.cylinder liner sealings
D.cylinder liner ring grooves

5.单项选择题In a diesel engine, blow-by is a result of combustion gases leaking into the crankcase past the ()

A.wrist pin bushings
B.compression rings
C.cylinder liner seals
D.cylinder liner sealing ring

6.单项选择题A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?()

A.Gasoline
B.Water
C.Lubricating oil
D.sulphur compounds

7.单项选择题Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring()

A.back clearance
B.side clearance
C.gap clearance
D.taper clearance

8.单项选择题Heavy residual fuel oils are heated prior to centrifuging to ()

A.reduce fuel weight
B.increase specific gravity
C.separate fuel from lube oil
D.reduce fuel viscosity

9.单项选择题In a diesel engine, blow-by is generally the result of worn()

A.valve guides
B.oil control rings
C.valve seats
D.compression rings