If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.

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• If the detergent type lubricating oil being used in a diesel engine is black, the oil （）

  A . must be centrifuged B . must by filtered C . must be changed D . is holding finely dispersed carbon in suspensio

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• If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）

  A . decrease until the engine speed increases B . increase as the load increases C . decrease as the load D . increases remain unchanged

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• If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）

  A . backfire through the air intakes B . develop less power under load C . have high firing pressures D . lift its cylinder relief valve

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• If a diesel engine fails to start，one of the likely causes is （）

  A . low compression temperature B . low ambient air pressure C . high lube oil pump pressure D . high fuel oil booster pump pressure

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• If a diesel engines exhaust temperature is abnormally high, the cause could be（）

  A . too light of a load B . injection timing is too early C . overloading of the engine D . too low of a compression ratio

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• If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）

  A . on the power stroke B . on the exhaust stroke C . at the end of the power stroke D . at the start of the intake stroke

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• A diesel engine will lose power if fuel injection occurs too early because the （）

  A . fuel will not be properly atomized in the cylinder B . ignition will be delayed due to low ignition temperature C . maximum fuel expansion will occur on the compression stroke D . fuel will ignite before top dead center

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• If a diesel engine rotates slowly when cranked, but does not fire, the（）

  A . fuel control rack had admitted excessive fuel B . engine speed does not match the fuel rack setting C . engine has failed to reach its firing speed D . starter pinion and ring gear contact is not correct

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• If water is found in the crankcase of a diesel engine, the cause may be due to（）

  A . a cracked cylinder head B . a leaky cylinder head gasket C . a cracked cylinder liner D . any of the above

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• On a diesel engine equipped with an isochronous governor, if the “speed droop” control is reduced to the “zero” setting, the engine （）

  A . speed will drop drastically with any increase in load B . will stop due to zero fuel supply C . will stall upon application of load D . speed will remain fairly constant despite load change

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• A diesel engine may be hard to start if the （）

  A . air intake is restricted B . engine is cranked too fast C . vibration dampener is faulty D . exhaust back pressure is low

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• If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）

  A . excessively late injection timing for each cylinder B . incorrectly adjusted intake valve timing C . incorrectly adjusted fuel injector D . incorrectly adjusted intake valve clearance

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• If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?（）

  A . Fuel B . Lubricating C . Cooling D . Ignitio

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• If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.

  A . 525 RPM B . 775 RPM C . 1550 RPM D . 1800 RPM

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• If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）

  A . immediately open all crankcase relief ports B . increase crankcase exhauster speed to draw cool air into the engine C . allow the engine to cool naturally D . increase crank case scavenge air to remove unburned gase

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• The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the （）.

  A . turbocharger stalls B . exhaust pressure increases C . air charge density decreases D . scavenge effect increase

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• If a diesel engine is smoking excessively under load, the cause could be （）

  A . low exhaust back pressure B . early fuel injection in one of the cylinders C . compression pressure in one of the cylinders D . plugged injector hole

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• The diesel engine is a type of （）.

  A、A. turbine engine B、B. gas turbine C、C. steam engine D、D. internal combustion engine

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• If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）

  A . cavitation erosion in the water jackets B . excess corrosion inhibitor in the coolant C . dirty jacket water cooler D . defective turbocharger

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• Charging-air pressure increases if there is incorrect combustion and drop in the （） of the diesel engine.

  A . machine efficiency B . machinery efficiency C . mechanical efficiency D . mechanics efficiency

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• If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）

  A . a broken shaft on the freshwater pump B . an excessive accumulation of scale exchanger C . an incorrect thermostatic element operating range D . lube oil in the cooling water

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• If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the （）

  A . fuel line connections to cylinder injection valves B . gasket surfaces of the fuel oil filters C . discharge fitting of the fuel injector pumps D . suction side of the fuel oil tra

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• Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?（）

  A . Air will enter the cooling system B . Carbon will plug the water cooled exhaust manifolds C . The jacket water temperature will rise D . The lube oil viscosity will increase

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• The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the _____.

  A.turbocharger stalls B.exhaust pressure increases C.air charge density decreases D.scavenge effect increases

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