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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. Length x Width






2. 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






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






4. 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)






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






6. When the fluid is in motion






7. Force/Area






8. 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






9. Often a free body has _______ acting on it






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






11. Work/force or vertical distance/sloping distance






12. Combustion ignited by spark plug and materials are compressed






13. Combustion of fuel mixture ignited by spark plug






14. A pull on an object






15. Air is drawn in






16. 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






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






18. The branch of science and engineering involving measurement






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






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






21. 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






22. (Force)(Distance)/Seconds






23. 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






24. Piston travels up and both plugs are closed






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






26. 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






27. 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 (






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






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






30. (pi) x (radius)^2






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






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






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






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






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






36. Varies by location (on earth) - distance (from earth) - and mass (of planet)






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






38. Static - Dynamic






39. 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






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






41. Length / Time






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






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






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






45. What we are studying






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






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






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






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






50. 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