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






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






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

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4. Static - Dynamic






5. A pull on an object






6. (pi) x (radius)^2






7. Applied at an angle or parallel to a surface






8. One that pushes on an object






9. Compression-Tension-Shear






10. Describes how applied forces bring a body into motion






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






12. Air is drawn in






13. Often a free body has _______ acting on it






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






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






16. When the moving fluid is a gas






17. 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






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






19. The branch of science and engineering involving measurement






20. Combustion ignited by spark plug and materials are compressed






21. Can be applied at a time on an object






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






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






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






26. 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






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






28. Combustion of fuel mixture ignited by spark plug






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






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






31. Body in motion (car)






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






33. An indication of kinetic energy of mass at the molecular level






34. 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






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






36. Dimensions and units






37. ICE generates electricity for electric battery -Electric motor turns wheels






38. Translation (slide) -Rotate -Slide and Rotate Together






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






40. 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






41. Force/Area






42. 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)






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






44. 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






45. Work/force or vertical distance/sloping distance






46. 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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47. The magnitude of something in a particular direction






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






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






50. 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