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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. Applied at an angle or parallel to a surface






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






4. Weight/Time






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






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






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


8. 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






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






10. 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






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






12. 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






13. Exhaust of combustion products






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






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






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






17. 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






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






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






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






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






22. Piston travels up and both plugs are closed






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






24. Describes how applied forces bring a body into motion






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






26. Can be applied at a time on an object






27. Often a free body has _______ acting on it






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






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






30. When fluid is at rest






31. A combination of components






32. Compression of fuel mix






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






34. When the moving fluid is a gas






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






36. Length x Width x Height






37. Length / Time






38. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq






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






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






41. 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






42. Two stroke- Four Stroke- Diesel-Rotary -Hybrid






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






44. Static - Dynamic






45. Force/Area






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






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






48. 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






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






50. One that pushes on an object