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






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






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






4. Psi - newtons - pascals






5. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width






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






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






8. Mass x acceleration






9. When fluid is at rest






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






11. The magnitude of something in a particular direction






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






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






14. Combustion ignited by spark plug and materials are compressed






15. Force without machine/Force with machine






16. Static - Dynamic






17. Dimensions and units






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






19. 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






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






21. Piston travels up and both plugs are closed






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






23. Can be applied at a time on an object






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






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






26. 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






27. If a force causes rotations -Vector- Machines can have more than one torque-Units: foot- pound and newton - meter - i.e. engines - airplanes - propeller






28. Ignition - power stroke






29. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us

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






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






32. A movement around a central pivot point (rotational movement) -Units: revolutions per second (rps) and revolutions per minute (rpm)






33. When the work done by the effort just equals the work done by the load - ______ of the machine will occur






34. A combination of components






35. Intake of fuel and air mix






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






37. 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






38. Length x Width x Height






39. (pi) x (radius)^2






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

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






42. Length / Time






43. 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






44. ...






45. Applied at an angle or parallel to a surface






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






47. 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






48. 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






49. Force/Area






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







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