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Mechanical Engineering

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Force/Area






2. Result of a force moving an object against a resistance through some distance in a desired direction -Work transfers energy -Work is a measure of what is done and not the effort applied - Done by lifting - pushing - rotating - or sliding -W=Fd -F=Amo






3. Combustion of fuel mixture ignited by spark plug






4. Describes a physical property of anything - What we are measuring






5. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment






6. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq






7. Body at rest or is in equilibrium (wall)






8. If the force needed to operate the machine (input force) is less than the force being opposed or the load being moved (output force) -The ratio of the output force divided by the input force -If the number is greater than one - there is a mechanical






9. Same pressure - work - volume - Different forces and distances






10. Translation (slide) -Rotate -Slide and Rotate Together






11. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid

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12. Two stroke- Four Stroke- Diesel-Rotary -Hybrid






13. Piston travels up and exhaust valve opens. Combustion by product exhaustion






14. Incompressible (volume doesnt change) Transmit force evenly - Lubricates - Trap contaminants - Some based on vegetable oils - Biodegradable - Aircraft fluids noncombustible (thins as temperature rises)






15. Three- dimensional property measured in units of length times length times length =length x width x height






16. When a simple machine increases a force it is at the expense of a ____ in the distance the load is moved






17. Often a free body has _______ acting on it






18. Every object continues in motion in a straight line unless acted upon by some force -Every object at rest continues at rest unless acted upon by a force -So forces cause a change in an object's state of motion

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19. Mass can neither by created nor destroyed - only transformed






20. A device that uses energy to do work to accomplish some desired activity - They do not produce energy - but they do transmit and transform energy - Machines can transmit a force - control its motion - and change its direction - a system of components






21. Describes how applied forces bring a body into motion






22. The magnitude of something in a particular direction






23. A system adopted from an old British system of units in the 13th century -Engineering system -Units: length- foot (ft) - time- second (s) - force-(lbs) - Mass is a derived unit called a slug -Political/Economic choice -Awkward






24. Friction changes KE to heat energy- Heat is transferred to air- Front brakes work harder than rear- Some brakes use asbestos- Newer cars have dual braking systems - Don't drive through water or your brakes won't work well (ride breaks to dry them out






25. The branch of science and engineering involving measurement






26. When two parallel forces equal in magnitude and opposite direction - i.e. steering wheel - turn a know - turn on and off a faucet






27. When fluid is at rest






28. Rotation will not occur - but translation might occur






29. A flat - sloping surface -The only simple machine that does not move -The force is applied to the ramp - since this is the direction the load weight is moved -Sloping side is longer than vertical side -Less force is required to accomplish the same am






30. Old technology- harder to service-Still used on big trucks and trailers because they are too expensive to convert






31. Force x Distance






32. Are independent of other dimensions - They are limited in number - length - mass - time - temperature - force






33. Piston travels down and intake valve is opened. Intake of fuel and air into chamber






34. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






35. Dimensions and units






36. Static - Dynamic






37. An indication of kinetic energy of mass at the molecular level






38. Exhaust of combustion products






39. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2






40. Psi - newtons - pascals






41. Brake pedal and linkage - Master Cylinder - Wheel cylinders (4) - Hydraulic lines - Hydraulic fluid - Mechanical advantage is provided by the foot pedal to the booster (level) - A greater force is applied on the wheel cylinders than on the brake peda






42. Combustion ignited by spark plug and materials are compressed






43. (Force)(Distance)/Seconds






44. When the work done by the effort exceeds the work done by the load - the load...






45. Pistons connected to crankshaft -1 stroke up - 1 stroke down of the piston -1 rotation of the piston -Problems: high emissions - noisy - inefficient - high vibrations - unburnt fuel - burnt oil -Benefits: small and light -Being phased out in USA - i.






46. Describes how applied forces bring a body into rest or equilibrium






47. Combine two or more power sources - locomotives - buses (diesel- electric) -Submarines (Nuclear- electric) -Components:gas engine - fuel tank - electric motor - generator - batteries - transmission -2 motors: Internal Combustion Engine and Electric E






48. Body in motion (car)






49. External Combustion engine -Only used in factories and plants (not used in cars)






50. The amount of atoms and molecules in something - Matter is energy that has become solid -An object gains mass when it gains more energy and vice a versa -Units: SI- kgs and USA: Slugs - lbs