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. Force without machine/Force with machine






3. The magnitude of something in a particular direction






4. Air is drawn in






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






6. When fluid is at rest






7. Used to measure or quantify -US Common: Absolute and Gravitational -SI: absolute






8. Mass x acceleration






9. (Force)(Distance)/Seconds






10. 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






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






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






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






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






15. Ignition - power stroke






16. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






17. 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)






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






19. ...






20. A pull on an object






21. Combustion of fuel mixture ignited by spark plug






22. 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






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






24. Force x Distance






25. Dimensions and units






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






27. One that pushes on an object






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






29. Length x Width x Height






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






31. What we are studying






32. Rotation may occur






33. 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






34. Liquid or gas






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






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






37. 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






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






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






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






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






42. Psi - newtons - pascals






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






44. Combustion ignited by spark plug and materials are compressed






45. Piston travels up and both plugs are closed






46. When the fluid is in motion






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






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






49. 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






50. 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