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. Rotation will not occur - but translation might occur






2. 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






3. Combine two or more power sources - locomotives - buses (diesel- electric) -Submarines (Nuclear- electric) -Components:gas engine - fuel tank - electric motor - generator - batteries - transmission -2 motors: Internal Combustion Engine and Electric E






4. Old technology- harder to service-Still used on big trucks and trailers because they are too expensive to convert






5. Mass x acceleration






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






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






8. (Force)(Distance)/Seconds






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






10. 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.






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






12. Compression-Tension-Shear






13. Length x Width






14. Force/Area






15. What we are not studying






16. 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






17. The branch of science and engineering involving measurement






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






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






20. When the moving fluid is a gas






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






22. Force x Distance






23. Psi - newtons - pascals






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






25. Dimensions and units






26. Compression of fuel mix






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






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






29. Ignition - power stroke






30. When fluid is at rest






31. The standard system of units that uses base 10 and used in the rest of the world. US does not use - but Great Britain does - Base Units: mass - kilograms (kg) - length- meters (m) - and time-Seconds (S) - Force is a derived unit measured in newtons (






32. Combustion ignited by spark plug and materials are compressed






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






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






35. 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






36. The magnitude of something in a particular direction






37. Often a free body has _______ acting on it






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






39. 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






40. Can be applied at a time on an object






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






42. A combination of components






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






44. Work/force or vertical distance/sloping distance






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






46. When the fluid is in motion






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






48. 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)






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






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