Test your basic knowledge |

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. Describes how applied forces bring a body into motion






2. Often a free body has _______ acting on it






3. 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






4. Psi - newtons - pascals






5. 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






6. If a force causes rotations -Vector- Machines can have more than one torque-Units: foot- pound and newton - meter - i.e. engines - airplanes - propeller






7. 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.






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. Mass can neither by created nor destroyed - only transformed






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






12. The branch of science and engineering involving measurement






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






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






15. Air is drawn in






16. 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






17. The magnitude of something in a particular direction






18. A combination of components






19. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human






20. When fluid is at rest






21. Length x Width x Height






22. Used in cars -2 rotations of crankshaft -4 strokes (down - up - down - up) of piston - i.e. cars - trucks - planes - buses - motorcycles - submarine -1% of gas actually moves people






23. 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


24. Rotation may occur






25. One that pushes on an object






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






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






28. Combustion ignited by spark plug and materials are compressed






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






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






31. Rotation will not occur - but translation might occur






32. Can be applied at a time on an object






33. Compression-Tension-Shear






34. 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






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






36. 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






37. Force x Distance






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






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






40. Dimensions and units






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. (Force)(Distance)/Seconds






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






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






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






46. What we are studying






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






48. Force without machine/Force with machine






49. Work/force or vertical distance/sloping distance






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