IC Engine (Internal combustion engine) MCQ
What is the mechanism called that does work by means of a ready source of energy?
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What is Mechanical Injection?
Answer
Correct Answer:
Injection with the fuel-valve operated mechanically from a cam.
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What is the ratio of brake horsepower to indicated horsepower?
Answer
Correct Answer:
Mechanical efficiency
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What does MEP stand for?
Answer
Correct Answer:
Mean Effective Pressure
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What is a manometer?
Answer
Correct Answer:
A U-shaped glass tube, partly filled with a liquid, water or mercury, employed to measure pressure.
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What is a manifold?
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Correct Answer:
A pipe with a number of inlets to, or outlets from, the several cylinders of an engine.
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What is a lubricating pump?
Answer
Correct Answer:
A pump which handles lubricating oil in an engine.
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What is the main purpose of a lubricant?
Answer
Correct Answer:
To reduce friction
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What is the useful output of an engine at a given moment?
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What is the removable inner engine cylinder in contact with the piston called?
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What is linear motion?
Answer
Correct Answer:
Motion in a straight line.
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What is a lean mixture?
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Correct Answer:
A mixture in which the proportion of air to fuel is greater than that theoretically necessary for completes combustion.
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What does the lb. abbreviation stand for?
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What is a Lanova cell?
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Correct Answer:
A special combustion chamber for diesel engines of high rotary speeds.
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What is the land?
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Correct Answer:
The portion of the piston between two grooves carrying the piston rings.
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What is a shim?
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Correct Answer:
A thin metal sheet used to fill in spaces between objects.
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What does the word "laminated" mean?
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Correct Answer:
Made of thin layers
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What is kinetic energy?
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Correct Answer:
The energy of a moving body due to its mass and velocity.
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What is a unit of energy equal to a continuous flow of one kilowatt for one hour?
Answer
Correct Answer:
Kilowatt-hour
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What does "Kilowatt" mean?
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Correct Answer:
An electrical unite of measure equal to one thousand watts.
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What does kilowatt measure?
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Correct Answer:
Electrical unite
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What is the keyway?
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Correct Answer:
The machined slot in a shaft or hub of a wheel to take a steel key.
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What does a keeper dowel or pin do?
Answer
Correct Answer:
Keep piston rings from moving from an assigned position
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What is a Jumper?
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Correct Answer:
A water-pipe connection between a cylinder head and the cylinder jacket or the water-jacketed exhaust manifold.
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What is the finished part of a shaft that rotates in a bearing called?
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What is a jet?
Answer
Correct Answer:
A small orifice used to control the flow of fuel or air
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What is a Jerk Pump?
Answer
Correct Answer:
A fuel pump which injects fuel into the cylinder by action of a cam having a sharp nose.
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What is the purpose of a jacket surrounding an engine cylinder?
Answer
Correct Answer:
To permit circulation of cooling water
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What is the main use of a Jack?
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Correct Answer:
To lift or move a heavy object
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What does the word "Intermittent" mean?
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Correct Answer:
Occurring at intervals.
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What is an integral?
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Correct Answer:
An indivisible part of a whole, constituting a completed whole.
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What are the two strokes of a Piston?
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Correct Answer:
Intake stroke and suction stroke
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What is the inlet valve?
Answer
Correct Answer:
The valve through which air or the air-fuel mixture is admitted to the cylinder of a four-stroke engine.
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What is the inlet cam?
Answer
Correct Answer:
The cam that controls the operation of the air inlet valve in a four-stroke engine.
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What is the function of an injection pump?
Answer
Correct Answer:
Inject fuel oil into the combustion space of a diesel engine
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What is injection?
Answer
Correct Answer:
The forcing of fuel oil into the combustion chamber of a diesel engine by means of high pressure.
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Inertia is the tendency of a body to ______?
Answer
Correct Answer:
Maintain its existing velocity
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What is an Indicator?
Answer
Correct Answer:
Instrument used to investigate the pressures inside an engine cylinder.
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What is the indicated horsepower?
Answer
Correct Answer:
The horsepower developed in the engine cylinder, as calculated from an indicator diagram.
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What is the rotating part of a centrifugal pump or blower called?
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What is idling?
Answer
Correct Answer:
Engine running without a load at the lowest speed possible.
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What does the term "hydraulic" pertain to?
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Correct Answer:
Movement of and by water, also by other liquids, such as oils.
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What is hunting?
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Correct Answer:
Erratic variation of the speed of the governor, also of the engine.
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One horsepower is equal to ____?
Answer
Correct Answer:
33,000 ft-lb. per min.
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What is the rate at which work is done?
Answer
Correct Answer:
Rate at which work is done.
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What is a helix?
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Correct Answer:
A line cut on a cylindrical surface shaped like a screw thread.
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What does it mean if something is helical?
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Correct Answer:
Having the shape of a helix, or screw.
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What is the unit of heat value?
Answer
Correct Answer:
Btu per Pound
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What is the heat value?
Answer
Correct Answer:
The heat developed by the combustion of one pound of fuel
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What is the unit of heat?
Answer
Correct Answer:
British thermal unit (Btu)
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What is heat?
Answer
Correct Answer:
A form of energy
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What is a governor?
Answer
Correct Answer:
A mechanism used to control the speed of an engine.
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What is a gasket?
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Correct Answer:
Packing placed between two surfaces that must have a leakproof joint.
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What is the term for the support on which a lever turns?
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What is the function of the fuel pump?
Answer
Correct Answer:
Delivers the fuel to the injector
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What is the noise produced in the cylinder of a diesel engine during combustion called?
Answer
Correct Answer:
Fuel knock
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What is the device which sprays the fuel into the cylinder called?
Answer
Correct Answer:
Fuel Injector
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What is friction horsepower?
Answer
Correct Answer:
The power consumed within the engine from friction between its parts.
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What is friction?
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Correct Answer:
The resistance to relative motion between two bodies in contact.
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What is the part of an engine between the cylinders and the bedplate?
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Which of the following is NOT a type of engine?
Answer
Correct Answer:
Four-stroke engine
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What is the unit in which work is measured?
Answer
Correct Answer:
Foot pound
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What is the flywheel responsible for?
Answer
Correct Answer:
Gives the crankshaft momentum to carry the pistons through the compression stroke.
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What is Fluctuation?
Answer
Correct Answer:
Variation in value
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What does the term "Fit" mean in regards to machined engine parts?
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Correct Answer:
The desired positive or negative clearance between the surfaces of two machined engine parts.
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What does a filter do?
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Correct Answer:
Remove dirt and other impurities from air, oil, or water.
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The expansion period is the portion of the power stroke during which:?
Answer
Correct Answer:
The combustion gases expand from the movement of the piston and thus do work.
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What is the function of an exhaust valve?
Answer
Correct Answer:
The valve through which the burnt gases are allowed to pass out to the exhaust manifold.
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What is an exhaust pyrometer?
Answer
Correct Answer:
An instrument used to measure the temperature of the exhaust
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What is the exhaust manifold?
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Correct Answer:
The pipe that collects the burnt gases as they are expelled from the cylinders.
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What are exhaust gases?
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Correct Answer:
Products of combustion which are discharged from the cylinder after doing work on the piston.
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What is the exhaust cam?
Answer
Correct Answer:
The cam that controls the operation of the exhaust valve.
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What is the act of discharging gases from an engine after they have done work called?
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What does an engine do?
Answer
Correct Answer:
Produces power to do work
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What is energy?
Answer
Correct Answer:
Capacity for doing work
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What does EMF stand for?
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Correct Answer:
Electromotive force
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What is efficiency?
Answer
Correct Answer:
The ratio of output over input.
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What is the meaning of the word "eccentric"?
Answer
Correct Answer:
A circle not having the same center as another circle within it
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What is a dynamometer?
Answer
Correct Answer:
A device for determining the power of an engine.
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What is dribbling?
Answer
Correct Answer:
Slow seeping of fuel oil from the nozzle tip after cutoff of the fuel.
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What is the function of a distributor?
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Correct Answer:
Directs the flow of fuel or compressed air to the various cylinders of the engine in proper sequence.
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What is distillation?
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Correct Answer:
Separation of the more volatile parts of a liquid from those less volatile by vaporization and subsequent condensation.
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What type of engine is a diesel engine?
Answer
Correct Answer:
A compression-ignition combustion engine
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What is a violent uncontrolled burning of a fuel in the combustion chamber called?
Answer
Correct Answer:
Detonation
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Which of the following is not a property of the delivery stroke?
Answer
Correct Answer:
The stroke of a pump during which the fluid in the pump is forced out of the cylinder.
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What is the cylinder head?
Answer
Correct Answer:
The part which covers and seals the end of the cylinder and usually contains the valves.
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What is the term for the inside diameter of an engine cylinder?
Answer
Correct Answer:
Cylinder bore
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What is a cylinder block?
Answer
Correct Answer:
A number of cylinders cast in one piece.
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In an engine, combustion takes place in which part?
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What is a cycle?
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Correct Answer:
A series of events, operations, or movements that repeat themselves in a regular sequence
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What is the crosshead supported on?
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What is the crankshaft web?
Answer
Correct Answer:
The part of the crankshaft between the bearings
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What is the crankshaft journal?
Answer
Correct Answer:
The part of the crankshaft which rotates in the main bearings and transmits the torque developed by the engine.
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What is the crankshaft cheek?
Answer
Correct Answer:
The part of the crankshaft that connects the crankpin to the main crankshaft journal.
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What does a crankshaft do?
Answer
Correct Answer:
Transmits the reciprocating motion of the pistons to the driven unit in the form of rotary motion.
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What is the crankpin?
Answer
Correct Answer:
That part of the crank to which the connecting rod is attached.
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What is the lower portion of the engine structure called?
Answer
Correct Answer:
Crankcase subbase
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What is the crankshaft?
Answer
Correct Answer:
The system in charge of cooling an engine
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What is a crank?
Answer
Correct Answer:
That part of the crankshaft, which is in the form of a crank and crank pin.
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What is the purpose of cooling water?
Answer
Correct Answer:
To prevent excessive heating of cylinders and cylinder heads.
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What is contraction?
Answer
Correct Answer:
Becoming smaller in size
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What is combustion in a cylinder so fast that there is no change in volume called?
Answer
Correct Answer:
Constant-volume combustion
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What is combustion of fuel in a cylinder at so slow a rate that there is no rise in cylinder pressure called?
Answer
Correct Answer:
Constant-pressure combustion
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What is the term for a value in an equation which does not change?
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What is a connecting rod bearing?
Answer
Correct Answer:
The bearing located in the large end of the connecting rod by which it is attached to the crankshaft.
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What is the connecting rod?
Answer
Correct Answer:
The engine part which connects the piston to the crankshaft.
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