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22 Cards in this Set
- Front
- Back
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An injection nozzle is used to _______________ the fuel in a diesel engine. A) eject B) mix C) ignite D) atomise E) aspirate |
D |
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Reduction in sealing qualities between the piston rings and cylinder wall by the lube oil may be the result of: A) low cooling water temperature B) high lube oil viscosity C) high cooling water temperature D) high carbon residue of the lube oil E) wrong fuel being used |
C
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In which ways might a diesel engine be started? 1. hand cranking 2. air starter motor 3. electric starter 4. compressed air delivered to cylinders A) 1, 2 B) 3, 4 C) 1, 2, 3 D) 2, 3, 4 E) 1, 2, 3, 4 |
E
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Ignition in a diesel engine is started by: A) a glow plug B) a spark plug C) a starter motor D) compression in the cylinder E) air injection |
D
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What is a fuel’s resistance to premature detonation called? A) octane rating B) knock C) detonation resistance D) cetane number E) benzene level |
A
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The purpose of a spark plug is: A) to ignite the fuel air mixture in a gasoline engine B) to produce power for the compression stroke C) to prewarm the engine D) to raise the ignition point of the fuel E) to ignite the air in the cylinder |
A
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What might improper or poor fuel injection be caused by? A) piston blowby B) worn injector orifices C) poor cylinder compression D) high cylinder exhaust temperature E) clogged air ports |
B
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Which statement is true of 4 cycle engines? A) The exhaust valve opens near the end of the power stroke B) There is one power stroke for every revolution of the crankshaft. C) The spark plug ignites the air/fuel mixture when the piston is at "top dead centre". D) The order of the strokes is: power, intake, exhaust, compression E) The downward movement of the piston causes the camshaft to rotate. |
A
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How is fuel vapourized in a gasoline engine? 1. a fuel pump 2. an injector 3. a carburetor 4. a vapourizer A) 1, 2 B) 2, 3 C) 3, 4 D) 1, 2, 3 E) 2, 3, 4 |
B
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Although many new 2-stroke spark ignition engines have oil injection, what method of lubrication is still widely used? A) a pressure pump B) a pre-mixed oil/gasoline mixture C) drip lubricators D) splash lubrication E) oil rings |
B |
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Internal combustion engines used to drive gas compression machinery and which burn natural gas operate on the __________ stroke cycle. A) one B) rotary C) two D) two or four E) four |
D |
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Compression ignition engines: A) need suction end discharge valves B) will compress air only on the compression stroke C) need a carburator to mix the fuel with the air D) will compress air only on the power stroke E) require a spark timing device |
B |
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The injection pump of a diesel engine is driven by: A) piston action B) the governor C) the wrist pin D) the gudgeon pin E) the camshaft |
E |
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What must be done before starting a large diesel engine? A) check the valve clearance B) change the oil C) prime the fuel injector pump D) warm up the air start motor E) purge the exhaust system |
C |
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In the case of a large industrial diesel which is started using compressed air directed to cylinders, when is the air actually admitted to the cylinder? A) on the intake stroke B) on the compression stroke C) on the power stroke D) on the exhaust stroke E) on the scavenging stroke |
C |
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Diesel engine governing is accomplished by A) varying the fuel quality B) carburetion C) varying the fuel quantity D) fuel atomising air quantity E) fuel atomising air pressure |
C |
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When using compressed air to each cylinder for starting purposes, the pressure is approximately: A) 520 kPa B) 255 kPa C) 3,030 kPa D) 2,100 kPa E) 435 kPa |
D |
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To what approximate pressure does the compression in a 4-stroke diesel engine rise to? A) 500 – 950 kPa B) 1200 – 1800 kPa C) 1500 – 2200 kPa D) 2000 – 3300 kPa E) 2800 – 4200 kPa |
E |
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How many "ports" does a simple 2-stroke spark ignition engine have? A) 1 B) 2 C) 3 D) 4 E) 5 |
C |
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In a compression ignition engine the fuel is ignited by: A) an electric spark B) the compressed air temperature C) the atomized fuel D) a cross-combustor E) compressed air pressure |
B |
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How high might the compression ratio in a diesel engine be? A) 5:1 B) 10:1 C) 15:1 D) 20:1 E) 25:1 |
E |
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What problems could a leaking fuel injector cause in a diesel engine? 1. abnormally high exhaust temperatures 2. smoky exhaust 3. high coolant temperature 4. oil dragging A) 1, 2 B) 3, 4 C) 1, 2, 3 D) 2, 3, 4 E) 1, 2, 3, 4 |
A |
