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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. Result of gravity acting on mass -The greater the mass - the greater the weight -Is a force -Units: lbs - N






2. Combustion of fuel mixture ignited by spark plug






3. Air is drawn in






4. What we are not studying






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






6. Can be applied at a time on an object






7. 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






8. When fluid is at rest






9. The branch of science and engineering involving measurement






10. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag






11. 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






12. 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






13. Intake of fuel and air mix






14. Exhaust of combustion products






15. The designing of machines that contribute to society and our quality of life - Mechanical engineers apply the principles of mathematics - chemistry - and physics to solve real- world problems






16. A combination of components






17. (Force)(Distance)/Seconds






18. Exhaust






19. 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.






20. Describes how applied forces bring a body into motion






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






22. Fuel is injected and combusts due to temperature of compressed air






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






24. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human






25. A small piece that makes up a larger whole. Each component is there for a specific job - but the sum of components






26. Applied at an angle or parallel to a surface






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






28. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous






29. ICE generates electricity for electric battery -Electric motor turns wheels






30. Air is compressed - work is done on the system






31. Rotation will not occur - but translation might occur






32. Used in cars -2 rotations of crankshaft -4 strokes (down - up - down - up) of piston - i.e. cars - trucks - planes - buses - motorcycles - submarine -1% of gas actually moves people






33. Ignition - power stroke






34. 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






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






36. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2






37. Piston travels up and both plugs are closed






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






39. 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






40. 1. Magnitude: size - a numberi.e. 50 mph 2. Direction: angle i.e. N -E -W -S






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






42. Can be applied:-By direct contact: push - pull - twist -At a distance: gravity - magnetism Can change: speed - direction - shape - units of force






43. Intake of fuel and air mixture - compression of mixture by piston






44. A^2+b^2=c^2






45. Psi - newtons - pascals






46. More compact (size of beer keg) - No valves -Benefits: fewer parts - lower engine weight Problems: seal - lower inertia forces -1 rotar=3 to 4 pistons






47. Liquid or gas






48. When the sum of all forces and the sum of all moments both equal forces - No movement






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






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