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Engines test
| Question | Answer |
|---|---|
| When describing engines in term of square over square and under square what measurement always come first? | Bore |
| When describing the piston position in an engines bore, what are the four acronyms are used to express location? | TDC, ATDC, BDC, BTDC |
| Which of the following accurately describes engine displacement? | Total piston, swept volume |
| During which of the four strokes of the diesel cycle is the cylinder pressure at its highest in a running diesel engine? | Power |
| During what event of the intake and exhaust strokes does scavenging take place on a four stroke diesel engine? | Valve overlap |
| Power output in the diesel engine is regulated by: | Controlling the amount if fuel injected |
| Which of the following conditions occurs when the compression pressure is lower than normal in a diesel engine? | White smoke |
| Which three elements are necessary for combustion? | oxygen, fuel, heat |
| In the four stroke diesel cycle, during the intake stroke: | Air is only drawn in |
| The measure of a diesel fuel ability to ignite quickly is referred to as: | The cetane number |
| what tools should be used to check a cylinder block deck for warp age? | Straight edge & thickness gauges |
| When cavitation damage is evident on a set of wet liners, which of the following is more likely to be responsible? | Coolant breakdown |
| Most current heavy duty, diesel engine cylinder blocks are manufactured from: | Compacted graphite iron (CGI) |
| When boiling out a cylinder block, why is it critical that all scale in the water jacket be removed? | Scale is an effective insulator |
| Rod & main bearing journals clearances are properly measured with: | Plastigage |
| What is the disadvantage of an articulated piston assembly when comparing it to an aluminum alloy trunk piston? | Increased tensile loading on the connecting rods |
| what condition would a piston ring seal more effectively? | High cylinder pressure |
| Where would a Ni - resist insert be located? | upper ring belt, aluminum trunk piston |
| What type of piston is favored by diesel engines OEMS in past - 2007 products? | Forged steel trunk |
| What should be used to install piston rings onto a piston? | Ring expander |
| Rod & main bearing journal clearances are properly measured with: | Plastigauge |
| A camshaft gear is usually precisely positioned on the camshaft using a: | Key & Keyway |
| What tool would be required to measure the camlift of a cylinder block mounted camshaft in position? | Dial indicator |
| Which direction must a camshaft be rotated on a diesel engine with a crank that is rotated clockwise? | Either clock wise or counter clock wise, depends on the engine |
| On a cam-profile that is exactly opposite the toe is referred to as the: | Heel |
| A crankshaft has a fracture failure that appears to have initiated at a throw journal oil hole. What would be the cause? | Failed vibration damper |
| What would be the more likely outcome of running an engine with a failed vibration damper? | Crankshaft failure |
| Balanced steel housing, inertia ring, silicon fluid, mercury, Which of the following is not a component of a viscous type vibration damper? | mercury |
| What should be used to measure the alignment of the flywheel housing in relation to the center line of the crankshaft? | magnetic base and dial indicator |
| oil that has a milky, clouded appearance is probably contaminated with: | Engine Coolant |
| oil that has a cloudy, appearance is probably contaminated with: | Water |
| Which type of oil pump is most commonly used in current highway diesel engines? | External Gear |
| When investigating a low oil pressure complaint, what should you check for? | Check the crankcase oil level |
| What transfers heat more efficiently? | Pure water |
| What is the warmest portion of a typical downflow-type radiator? | The Top tank |
| What describes the operating principle of a typical coolant pump on a highway diesel engine? | Centrifugal |
| When the thermostat routes the coolant through the bypass circuit, what is happening? | The Coolant is cycled primarily through the engine |
| Wet liner cavitation is caused by: | Vapour bubble collapse |
| If a rad cap pressure valve fails to seal, what would be the likely outcome? | Coolant boil off |
Created by:
RyanHakim