單項選擇題A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）

A.worn valve seats
B.worn main bearing
C.excessive valve clearance
D.weak rocker arm springs


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1.單項選擇題In the cylinder of a diesel engine fuel is ignited by the（）

A.spark from a plug in the pre-combustion chamber
B.electrical discharge from the distributor
C.heat of compression within the cylinder
D.heat from the fuel injection nozzle

2.單項選擇題Diesel engine air start valve timing is controlled by（）

A.engine operating speed
B.an air manifold
C.a hydraulic distributor
D.individual cams and valve gear

3.單項選擇題The timing of diesel engine air starting valves is controlled by（）

A.the air start valve timing gears and rods
B.a cylinder check valve
C.individual cams and valve gear
D.an air manifold poppet valve

4.單項選擇題The minimum fuel oil delivery pressure required for diesel engine injection depends primarily on the（）

A.degree of cylinder air turbulence
B.firing pressure in the engine
C.quality of fuel to be injected
D.duration of the ignition delay period

5.單項選擇題One method of determining crankshaft misalignment is by（）

A.laying a straight edge across the crank webs at the crankpin and measuring the distance to the crankpin in two places
B.measuring the crank drop on either side of each crank throw while the crankshaft is slowly rotated through one revolution
C.rotating the crankshaft through one revolution, pausing each 90oof rotation to measure bearing clearances, top and bottom
D.taking micrometer reading between the crank cheeks opposite the crankpin every 90°of crank angle rotation