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單項選擇題

Poor quality fuel being used in a turbocharged medium-speed, diesel engine could result in （）

A.hard starting
B.excessive fuel consumption
C.loss of power
D.all of the above

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單項選擇題
Many diesel engine exhaust valves are being constructed with hollow stems filled with sodium in order to （）
A.provide added wear protection against today’s corrosive quality of fuel
B.increase overall valve strength due to the high gas pressures
C.assist in dissipating heat due to the extreme operating temperatures
D.reduce the overall weight of the valve thus helping eliminate valve spring surge and hammering
單項選擇題
Cracking of a diesel piston crown can result from（）
A.Excessive piston to liner clearance
B.The underside of the piston crown being excessively dirty lowering the rate of heat transfer
C.Faulty nozzle spray
D.All of the above
單項選擇題
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
單項選擇題
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
單項選擇題
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
單項選擇題
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
單項選擇題
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
單項選擇題
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
單項選擇題
A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?（）
A.Gasoline
B.Water
C.Lubricating oil
D.sulphur compounds
單項選擇題
Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）
A.back clearance
B.side clearance
C.gap clearance
D.taper clearance