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Mechanical Engineering

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes. 2 minutes extra for reading the instructions.
  • 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. 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






2. 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






3. Incompressible (volume doesnt change) Transmit force evenly - Lubricates - Trap contaminants - Some based on vegetable oils - Biodegradable - Aircraft fluids noncombustible (thins as temperature rises)






4. ...






5. 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.






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






7. Static - Dynamic






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






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






10. Length x Width






11. A pull on an object






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






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






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






15. Mechanics is an application of math that describes how forces affect a body






16. Force/Area






17. 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






18. A combination of components






19. What we are not studying






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






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






22. 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


23. Force without machine/Force with machine






24. 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






25. Two stroke- Four Stroke- Diesel-Rotary -Hybrid






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






27. 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






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






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. Combustion ignited by spark plug and materials are compressed






31. Often a free body has _______ acting on it






32. 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






33. Body in motion (car)






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






35. Applied at an angle or parallel to a surface






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






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






38. Exhaust of combustion products






39. Air is drawn in






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






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






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






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






44. Combustion of fuel mixture ignited by spark plug






45. Rotation may occur






46. What we are studying






47. 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






48. Compression of fuel mix






49. (Force)(Distance)/Seconds






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






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