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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. A quantity that has both magnitude and direction when placed within a coordinate system -Forces and Velocity i.e. driving 50 miles to the northeast






2. Force/Area






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






4. Exhaust






5. Allows comparison between different measuring systems and units - Necessary to market internationally






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






7. Combustion of fuel mixture ignited by spark plug






8. Liquid or gas






9. Body in motion (car)






10. 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






11. 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






12. 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.






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






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

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15. Rotation may occur






16. Static - Dynamic






17. Both engines drive wheels -ICE used for cruising -Electric motor assists with low speed for acceleration and hill climbing






18. Length x Width x Height






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






20. Mass x acceleration






21. 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






22. Piston travels up and both plugs are closed






23. Exhaust of combustion products






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






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






26. Force without machine/Force with machine






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






28. (Force)(Distance)/Seconds






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






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






31. 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






32. Modern Technology- More efficient-Better Cooling-Easier to service- longer life - lither weight- More expensive






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






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






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






36. (pi) x (radius)^2






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






38. Dimensions and units






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






40. Tells us how fast work is done - varies with time (more power is needed to do work in less time - and less power is needed to do work in more time) =Fd/s -Units: USA: ft- lb/s SI: watts (J/S)






41. 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






42. Movement along a line (reciprocal or linear motion) -Units: feet and meters






43. A^2+b^2=c^2 - used to calculate vectors






44. 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






45. Ignition - power stroke






46. Psi - newtons - pascals






47. The force simple machines use to do work on a single load or against a single force






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






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






50. Often a free body has _______ acting on it






Can you answer 50 questions in 15 minutes?



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