Exam (elaborations)
A1 Engine Repair Questions with Explanations of Answers | latest upate 2024
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- 2024- 2025 prep test
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- 2024- 2025 Prep Test
A1 Engine Repair Questions with Explanations of Answers | latest upate 2024
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A1 Engine RepairAbrasion - ANS -rubbing away or wearing of a part
Abrasive Cleaning - ANS -cleaning that requires physical abrasion (glass bead
blasting, wire brushing)
Acidity - ANS -in lubrication, the presence of acid-type chemicals, which are
identified by the acid number
Additive - ANS -material added to the engine oil to give it certain properties
Adhesion - ANS -an oil's ability to cling to a surface
Aeration - ANS -the process of mixing air with liquid
Aerobic - ANS -curing when exposed to oxygen
Air Duct - ANS -a tube, channel or other tubular structure used to carry air to a
specific location
Air Gap - ANS -space or gap between spark plug electrodes, motor and generator
armatures and field shoes
Align Boring - ANS -a machining method that realigns bearing bores to center
and makes the bores round
Alignment - ANS -an adjustment to bring into a line
Alloy - ANS -a mixture of different metals
Aluminum - ANS -a lightweight metal used often for cylinder heads and other
parts
Ambient Temperature - ANS -the temperature of the air surrounding an object
Ammeter - ANS -instrument used to measure electrical current flow in a circuit
Ampere (amp) - ANS -unit for measuring electrical current
,Anaerobic - ANS -curing in the absence of oxygen
Antifreeze - ANS -a material such as ethylene glycol which is added to water to
lower its freezing point (used in an automobile's cooling system)
Atmospheric Pressure - ANS -the weight of the air at sea level or at higher
altitudes
Axial - ANS -having the same direction or being parallel to the axis of rotation
Axial Load - ANS -a type of lad placed on a bearing that is parallel to the axis of
the rotating shaft
Axial Play - ANS -movement parallel to the axis of rotation
Babbitt - ANS -a soft bearing alloy used in engine bearings
Backlash - ANS -the clearance or play between two parts, as in gear mesh
Backpressure - ANS -pressure created by restriction in an exhaust system
Balance Shaft - ANS -weighted shaft used on some engines to reduce vibration
Ball Bearing - ANS -an anti-friction bearing that uses a series of steel balls held
between inner and outer bearing races
Barometric Pressure - ANS -the pressure of the atmosphere, usually expressed
in terms of the height of a column of mercury
Base Circle - ANS -the part of a camshaft lobe that is opposite the tip of the nose
and does not move the valve in any way
Battery - ANS -a device that produces electricity through electrochemical action
Battery Acid - ANS -the sulfuric acid solution used as the electrolyte in a battery
Battery Cell - ANS -the part of a storage battery made from two dissimilar metals
and an acid solution
, Bearing - ANS -part that supports and reduces friction between a stationary and
moving part or two moving parts
Bearing Cap - ANS -the removable, lower half of the bearing saddle
Bearing Clearance - ANS -the space between a bearing and its corresponding
components loaded surface
Bearing Crush - ANS -the bearing is slightly larger at its parting lines so that
when the two halves of the bearing are tightened together, the bearing seats
firmly in its bore
Bearing Lining - ANS -the bearing surface area of a bearing, it is usually made up
of an alloy of several metals, including lead
Bearing Race - ANS -machined circular surface of a bearing against which the
roller or ball bearings ride
Bearing Spread - ANS -the condition in which the distance across the outside
paring edges of the bearing insert is slightly greater than the diameter of the
housing bore
Before Top Dead Center - ANS -the degrees of crankshaft rotation just before the
piston in a specific cylinder reaches TDC, the highest point in its vertical travel on
the compression stroke.
Big End - ANS -the large end of the connecting rod that connects to the
crankshaft
Blowby - ANS -the unburned fuel and prodects of combustion that leak past the
piston rings and into the crankcase at the last part of the combustion stroke
Bolt Diameter - ANS -measurement across the major diameter of a bolts threaded
area or the bolt shank
Bolt Head - ANS -part of the bolt that the socket or wrench fits over in order to
torque or tighten the bolt
Boost Pressure - ANS -term used when a turbocharger increases the air pressure
entering an engine above atmospheric pressure
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