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






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






3. ...






4. Length x Width






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






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






8. Intake of fuel and air mix






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






10. Applied at an angle or parallel to a surface






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






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






13. 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.






14. Air is drawn in






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






16. Weight/Time






17. The magnitude of something in a particular direction






18. Describes how applied forces bring a body into motion






19. 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)






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






21. 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






22. A pull on an object






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






24. When the fluid is in motion






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






26. Force/Area






27. Rotation may occur






28. Rotation will not occur - but translation might occur






29. 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






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






31. Compression-Tension-Shear






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






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

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34. Force and mass are proportional to each other (F=ma) -If F increases - so does acceleration -Force causes acceleration - More force means more acceleration - same mass - More mass means less acceleration - same force

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






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






37. 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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38. 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






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






40. Varies by location (on earth) - distance (from earth) - and mass (of planet)






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






42. 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






43. 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






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






45. Dimensions and units






46. The standard system of units that uses base 10 and used in the rest of the world. US does not use - but Great Britain does - Base Units: mass - kilograms (kg) - length- meters (m) - and time-Seconds (S) - Force is a derived unit measured in newtons (






47. Piston travels up and both plugs are closed






48. The branch of science and engineering involving measurement






49. Length x Width x Height






50. Ignition - power stroke