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. The magnitude of something in a particular direction






2. 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

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






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






5. Length / Time






6. Exhaust






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






8. Air is drawn in






9. Describes how applied forces bring a body into motion






10. Ignition - power stroke






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






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






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






15. What we are not studying






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






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. When the fluid is in motion






19. 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






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






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






22. 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






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






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






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






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






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






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






29. The branch of science and engineering involving measurement






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






31. 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






32. 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






33. Psi - newtons - pascals






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






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






36. Piston travels up and both plugs are closed






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






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






39. Dimensions and units






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






41. Compression-Tension-Shear






42. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid

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






44. Force x Distance






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






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






47. Mass x acceleration






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






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






50. 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