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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. 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






2. Air is drawn in






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






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






5. Combustion of fuel mixture ignited by spark plug






6. The branch of science and engineering involving measurement






7. One that pushes on an object






8. Length / Time






9. 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.






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






11. 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






12. When the moving fluid is a gas






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






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






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






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






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






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






19. Intake of fuel and air mix






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






21. 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






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






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






25. Combustion ignited by spark plug and materials are compressed






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






27. Compression-Tension-Shear






28. Work/force or vertical distance/sloping distance






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






30. 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






31. 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






32. Can be applied at a time on an object






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






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






35. Body in motion (car)






36. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us

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37. Force/Area






38. 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






39. Exhaust






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






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






42. Ignition - power stroke






43. Liquid or gas






44. Exhaust of combustion products






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






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






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






50. 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