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. When the moving fluid is a gas






2. Often a free body has _______ acting on it






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






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






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






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






7. Length x Width x Height






8. (pi) x (radius)^2






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






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






11. One that pushes on an object






12. Pistons connected to crankshaft -1 stroke up - 1 stroke down of the piston -1 rotation of the piston -Problems: high emissions - noisy - inefficient - high vibrations - unburnt fuel - burnt oil -Benefits: small and light -Being phased out in USA - i.






13. What we are not studying






14. 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






15. Rotation will not occur - but translation might occur






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






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






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






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






20. 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






21. A pull on an object






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






23. Weight/Time






24. Force x Distance






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






26. (Force)(Distance)/Seconds






27. Dimensions and units






28. 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






29. Compression of fuel mix






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






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






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






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






34. Can be applied at a time on an object






35. 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






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






37. 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






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






39. 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






40. Work/force or vertical distance/sloping distance






41. What we are studying






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






43. 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






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






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






46. 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


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






48. Compression-Tension-Shear






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






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