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






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






3. Psi - newtons - pascals






4. 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






5. 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)






6. 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






7. Can be applied at a time on an object






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






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






10. One that pushes on an object






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






12. 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






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






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






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






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






17. Result of a force moving an object against a resistance through some distance in a desired direction -Work transfers energy -Work is a measure of what is done and not the effort applied - Done by lifting - pushing - rotating - or sliding -W=Fd -F=Amo






18. Body in motion (car)






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






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






21. Mass can neither by created nor destroyed - only transformed






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






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






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






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






26. Length / Time






27. A combination of components






28. Force/Area






29. 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






30. 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






31. 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






32. The branch of science and engineering involving measurement






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






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. Dimensions and units






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






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






38. A small piece that makes up a larger whole. Each component is there for a specific job - but the sum of components






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






40. (pi) x (radius)^2






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. Piston travels up and both plugs are closed






43. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us

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44. Intake of fuel and air mix






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






46. Compression of fuel mix






47. Mass x acceleration






48. Static - Dynamic






49. A device that uses energy to do work to accomplish some desired activity - They do not produce energy - but they do transmit and transform energy - Machines can transmit a force - control its motion - and change its direction - a system of components






50. What we are not studying