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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. Dimensions and units






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






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






4. When fluid is at rest






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






6. Rotation will not occur - but translation might occur






7. Force/Area






8. Mass x acceleration






9. Combustion of fuel mixture ignited by spark plug






10. 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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11. When the moving fluid is a gas






12. 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






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






14. 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






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






16. 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.






17. Often a free body has _______ acting on it






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






19. 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






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






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






22. 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






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






24. Force without machine/Force with machine






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






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






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. Liquid or gas






29. Describes how applied forces bring a body into motion






30. 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






31. Air is compressed - work is done on the system






32. 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






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






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






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






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






37. A pull on an object






38. What we are not studying






39. A combination of components






40. ...






41. 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






42. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






43. Static - Dynamic






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






45. Air is drawn in






46. 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






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

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






49. When the fluid is in motion






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