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IC Engine (Internal combustion engine) MCQ

What is the mechanism called that does work by means of a ready source of energy?

Answer

Correct Answer: Motor

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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?

Answer

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?

Answer

Correct Answer: Load

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What is the removable inner engine cylinder in contact with the piston called?

Answer

Correct Answer: Liner

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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?

Answer

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?

Answer

Correct Answer: Pound

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What is a Lanova cell?

Answer

Correct Answer: A special combustion chamber for diesel engines of high rotary speeds.

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What is the land?

Answer

Correct Answer: The portion of the piston between two grooves carrying the piston rings.

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What is a shim?

Answer

Correct Answer: A thin metal sheet used to fill in spaces between objects.

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What does the word "laminated" mean?

Answer

Correct Answer: Made of thin layers

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What is kinetic energy?

Answer

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?

Answer

Correct Answer: An electrical unite of measure equal to one thousand watts.

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What does kilowatt measure?

Answer

Correct Answer: Electrical unite

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What is the keyway?

Answer

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?

Answer

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?

Answer

Correct Answer: Journal

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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?

Answer

Correct Answer: To lift or move a heavy object

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What does the word "Intermittent" mean?

Answer

Correct Answer: Occurring at intervals.

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What is an integral?

Answer

Correct Answer: An indivisible part of a whole, constituting a completed whole.

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What are the two strokes of a Piston?

Answer

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?

Answer

Correct Answer: Impeller

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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?

Answer

Correct Answer: Movement of and by water, also by other liquids, such as oils.

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What is hunting?

Answer

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?

Answer

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?

Answer

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?

Answer

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?

Answer

Correct Answer: Fulcrum

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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?

Answer

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?

Answer

Correct Answer: Framing

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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?

Answer

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?

Answer

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?

Answer

Correct Answer: The pipe that collects the burnt gases as they are expelled from the cylinders.

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What are exhaust gases?

Answer

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?

Answer

Correct Answer: Exhaust

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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?

Answer

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?

Answer

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?

Answer

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?

Answer

Correct Answer: Cylinder

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What is a cycle?

Answer

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?

Answer

Correct Answer: Guides

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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?

Answer

Correct Answer: Constant

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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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