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


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1.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

2.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

3.單項選擇題Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）

A.electronic ignition system
B.compression of air by the piston
C.friction in the fuel injector
D.fuel oil bearing system

4.單項選擇題Diesel engine crankshaft deflection readings are generally taken at four crank positionsGood engineering practice requires the deflection gage or indicator to be（）

A.placed as near the crankpin axis as possible
B.removed each time the crankshaft is repositioned
C.left in place for all four readings
D.reset to zero for all four readings

5.單項選擇題Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）

A.increase engine power
B.increase engine load
C.decrease engine power
D.improve fuel economy