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






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






3. When the fluid is in motion






4. Piston travels up and both plugs are closed






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






7. 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






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






9. Intake of fuel and air mix






10. Work/force or vertical distance/sloping distance






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






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






13. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag






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






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






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






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






18. The magnitude of something in a particular direction






19. (pi) x (radius)^2






20. 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






21. 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






22. 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






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






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






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






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






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






28. Body in motion (car)






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






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






31. 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






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






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






34. 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






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. Rotation may occur






37. Describes how applied forces bring a body into motion






38. 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






39. 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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40. Compression-Tension-Shear






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






42. A combination of components






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






44. Weight/Time






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






46. ...






47. When fluid is at rest






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






49. Exhaust






50. 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