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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. Exhaust of combustion products






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






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






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






5. 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


6. 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)






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






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






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






10. Rotation may occur






11. Force without machine/Force with machine






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






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






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






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


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






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






18. Length x Width x Height






19. Work/force or vertical distance/sloping distance






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






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






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






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






24. Ignition - power stroke






25. 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






26. Air is drawn in






27. Describes how applied forces bring a body into motion






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






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






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






31. Dimensions and units






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






33. 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






34. 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






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






36. Static - Dynamic






37. Compression-Tension-Shear






38. What we are studying






39. Intake of fuel and air mix






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






41. 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






42. Mass x acceleration






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






44. Exhaust






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






46. Applied at an angle or parallel to a surface






47. ...






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






49. Psi - newtons - pascals






50. 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