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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. 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






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






3. Compression-Tension-Shear






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






5. (pi) x (radius)^2






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






7. ...






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






9. A pull on an object






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






11. 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)






12. When the moving fluid is a gas






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






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






15. 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






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






17. 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






18. When the fluid is in motion






19. Work/force or vertical distance/sloping distance






20. Exhaust of combustion products






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






23. 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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24. 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






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






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






27. Force/Area






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






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






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






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






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

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33. 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






34. Compression of fuel mix






35. Combustion ignited by spark plug and materials are compressed






36. The branch of science and engineering involving measurement






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






38. 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






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






40. Intake of fuel and air mix






41. 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






42. Force x Distance






43. Length / Time






44. The magnitude of something in a particular direction






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






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






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






48. Often a free body has _______ acting on it






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






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