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






2. 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






3. Can be applied at a time on an object






4. Body in motion (car)






5. Length / Time






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






7. Static - Dynamic






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






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






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






11. A pull on an object






12. Dimensions and units






13. Combustion ignited by spark plug and materials are compressed






14. Length x Width






15. When the fluid is in motion






16. Rotation will not occur - but translation might occur






17. Ignition - power stroke






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






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






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






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






22. When the moving fluid is a gas






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






24. One that pushes on an object






25. 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






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






27. The magnitude of something in a particular direction






28. 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)






29. 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






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






31. 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






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






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






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






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






37. Rotation may occur






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






39. A^2+b^2=c^2 - used to calculate vectors






40. Force x Distance






41. Incompressible (volume doesnt change) Transmit force evenly - Lubricates - Trap contaminants - Some based on vegetable oils - Biodegradable - Aircraft fluids noncombustible (thins as temperature rises)






42. Psi - newtons - pascals






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






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






45. Describes how applied forces bring a body into motion






46. When fluid is at rest






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






48. Intake of fuel and air mix






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






50. The branch of science and engineering involving measurement