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. Force/Area






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






3. Exhaust






4. 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






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






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






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






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






9. 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






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






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






12. Often a free body has _______ acting on it






13. Rotation will not occur - but translation might occur






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






15. 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






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






17. 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






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






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






20. 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






21. Air is drawn in






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






23. What we are not studying






24. 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






25. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2






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






27. When the moving fluid is a gas






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






29. 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)






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






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






32. Can be applied at a time on an object






33. (Force)(Distance)/Seconds






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






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






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






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






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






39. Mass x acceleration






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






41. When the fluid is in motion






42. Describes how applied forces bring a body into motion






43. Combustion ignited by spark plug and materials are compressed






44. Describes how applied forces bring a body into rest or equilibrium






45. External Combustion engine -Only used in factories and plants (not used in cars)






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






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






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






49. Liquid or gas






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