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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. 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






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






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. 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






5. Intake of fuel and air mix






6. 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






7. Dimensions and units






8. 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






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






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






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






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






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






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






15. 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 (






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






17. 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






18. 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






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






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






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






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






23. Rotation will not occur - but translation might occur






24. Describes how applied forces bring a body into motion






25. Compression-Tension-Shear






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






27. Exhaust of combustion products






28. 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






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






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. 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.






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






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






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






35. One that pushes on an object






36. The magnitude of something in a particular direction






37. 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






38. Ignition - power stroke






39. Work/force or vertical distance/sloping distance






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






41. Piston travels up and both plugs are closed






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






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






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






45. Weight/Time






46. The branch of science and engineering involving measurement






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






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






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






50. When the moving fluid is a gas