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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. 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






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






3. Describes how applied forces bring a body into motion






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






5. 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






6. A pull on an object






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






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






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






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






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






12. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2






13. 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 (






14. (Force)(Distance)/Seconds






15. Length x Width x Height






16. 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






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






18. What we are not studying






19. 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






20. Exhaust of combustion products






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






22. Force/Area






23. Length x Width






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






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






26. Can be applied at a time on an object






27. 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






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






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






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






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






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






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






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






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






37. Force without machine/Force with machine






38. Piston travels up and both plugs are closed






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






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






41. Rotation will not occur - but translation might occur






42. 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)






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






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






45. Ignition - power stroke






46. Combustion of fuel mixture ignited by spark plug






47. 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






48. 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






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






50. Weight/Time