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






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






3. 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.






4. Weight/Time






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






6. When fluid is at rest






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






8. Force/Area






9. 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)






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






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






12. ...






13. 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






14. Air is drawn in






15. Mass x acceleration






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






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






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






19. Applied at an angle or parallel to a surface






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






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






22. The branch of science and engineering involving measurement






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






24. 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






25. An indication of kinetic energy of mass at the molecular level






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






27. 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






28. Force x Distance






29. 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






30. Describes how applied forces bring a body into motion






31. One that pushes on an object






32. 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






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






34. What we are studying






35. A fluid power system uses hydraulics and a fluid under pressure to create a greater force than is applied






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






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






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






39. 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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40. (pi) x (radius)^2






41. 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






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

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






44. Exhaust of combustion products






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






46. 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






47. Length x Width






48. Compression-Tension-Shear






49. Often a free body has _______ acting on it






50. Dimensions and units







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