In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）

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• A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.

  A . temperature of the exhaust gases B . energy supplied to the turbocharger C . air pressure to the intake manifold D . purge of exhausted gases from the cylinder

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• In a four-stroke cycle diesel engine the intake valves open （）

  A . before TDC and close after BDC B . after TDC and close after BDC C . before TDC and close before BDC D . after TDC and close before BDC

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• In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）

  A . air intake B . a fuel outlet C . cooling water inlets D . exhausting combustion ga

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• Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）

  A . In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater B . Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports C . No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine D . The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine

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• What is the crank angle between any two crank throws in the firing order of a four-stroke/cycle, in line, eight cylinder diesel engine?（）

  A . 45 B . 60 C . 90 D . 100

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• The process of scavenging a two-stroke/cycle diesel engine serves to（）

  A . improve fuel flow volume B . cool the exhaust valves C . reduce the intake air charge density D . increase the temperature of exhaust gase

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• A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）

  A . has little or no internal friction B . has a lower effective compression ratio C . operates with scavenge air under a positive pressure D . operates without energy absorbing intake and exhaust stroke

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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-stroke

  A . (1) only is correct B . (2) only is correct C . both (1) and (2) are correct D . Neither (1) or (2) are correct

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• Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）

  A . natural aspiration B . masked intake valves C . air cells D . scavenging air

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• Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）

  A . less even torque B . higher cylinder head temperatures C . fewer power strokes per revolution D . greater weight/size requirement

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• In a single acting, two-stroke/cycle, diesel generator engine, the power impulse in an individual cylinder occurs （）

  A . once every crankshaft revolution B . once every two crankshaft revolutions C . once every piston stroke D . twice every piston stoke

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• The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）

  A . pumping action of the piston B . pressure of the fuel charge C . vacuum developed in the manifold D . pressure of the fresh air charge

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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer

  A . (1) only B . (2) only C . both (1) and (2) D . neither (1) nor (2)

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• In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move（）

  A . up and draw in a fresh air charge B . down to burn off fuel C . down to compress the fuel air charge D . up and force out the exhaust gase

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• The two strokes of a two-stroke/cycle diesel engine are （）

  A . power and intake B . intake and exhaust C . exhaust and compression D . compression and power

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• Large, two-stroke/cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation, by using the （）.

  A . exhaust gas temperature system B . exhaust load system C . constant or pulse pressure system D . constant volume system

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• In a four-stroke/cycle diesel engine, the camshaft rotates at （）

  A . twice the crankshaft speed B . half the crankshaft speed C . the same speed as that of the crankshaft D . a speed independent of that of the crankshaft

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• Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）

  A、a circulating system; a total loss system B、a total loss system; a circulating system C、an opened system; a closed system D、a closed system; an opened system

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• 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 operatio

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• Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.

  A . The direction of pressure on the journal in four-stroke engine is continuously B . positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine C . four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines D . Low-stroke engines usually consume less lube oil than four-stroke engine

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• According to the principle of two stroke diesel engine, what is the number of its efficient work stroke per revolution?（）

  A . 1/2 B . 1 C . 2 D . 3

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• Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）

  A . Exhaust and scavenging B . Scavenging and compression C . Ignition and expansion D . Exhaust and compressio

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• In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）

  A . exhaust manifold B . valve bridge C . pressure of the fresh air charge D . valve adjusting gear

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• In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, ________.

  A.wide compression rings are used B.oil rings are located above the piston C.chromium plating is used on all piston rings D.oil rings are located near the bottom of the piston skirt

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