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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. 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






2. Often a free body has _______ acting on it






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






4. 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






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






6. Applied at an angle or parallel to a surface






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






8. Can be applied at a time on an object






9. Psi - newtons - pascals






10. Rotation may occur






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






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






13. 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






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






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






16. 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






17. Length x Width






18. Mass x acceleration






19. Dimensions and units






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






21. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human






22. Air is drawn in






23. Force/Area






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






25. 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.






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






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






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






29. What we are not studying






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






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






33. 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)






34. 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






35. Liquid or gas






36. 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






37. Used to measure or quantify -US Common: Absolute and Gravitational -SI: absolute






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






40. 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 (






41. Compression of fuel mix






42. Ignition - power stroke






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






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






46. Length / Time






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






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






49. One that pushes on an object






50. Four Stroke Engine -Used in hotter areas because more efficient -Higher compression ratio than gasoline