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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. Body in motion (car)






2. 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






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






4. 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






5. Length / Time






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






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






8. 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






9. Compression-Tension-Shear






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






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






12. Work/force or vertical distance/sloping distance






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






14. Liquid or gas






15. Psi - newtons - pascals






16. 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






17. Intake of fuel and air mixture - compression of mixture by piston






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






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. 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






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






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






23. What we are studying






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






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






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






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






28. If the force needed to operate the machine (input force) is less than the force being opposed or the load being moved (output force) -The ratio of the output force divided by the input force -If the number is greater than one - there is a mechanical






29. 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






30. Piston travels up and both plugs are closed






31. Mass x acceleration






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






33. Can be applied at a time on an object






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






35. What we are not studying






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

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37. 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






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






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






40. Rotation will not occur - but translation might occur






41. Static - Dynamic






42. Describes how applied forces bring a body into motion






43. Often a free body has _______ acting on it






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






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






46. Force x Distance






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






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






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






50. 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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