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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. Force and mass are proportional to each other (F=ma) -If F increases - so does acceleration -Force causes acceleration - More force means more acceleration - same mass - More mass means less acceleration - same force

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2. The magnitude of something in a particular direction






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






4. Exhaust of combustion products






5. Pistons connected to crankshaft -1 stroke up - 1 stroke down of the piston -1 rotation of the piston -Problems: high emissions - noisy - inefficient - high vibrations - unburnt fuel - burnt oil -Benefits: small and light -Being phased out in USA - i.






6. 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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7. 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






8. 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






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






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






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

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12. Often a free body has _______ acting on it






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






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






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






16. Applied at an angle or parallel to a surface






17. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment






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






19. Rotation will not occur - but translation might occur






20. Body in motion (car)






21. (pi) x (radius)^2






22. Dimensions and units






23. When the fluid is in motion






24. When fluid is at rest






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






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






27. Force/Area






28. Can be applied at a time on an object






29. A pull on an object






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






31. 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






32. Length x Width






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






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






35. The amount of atoms and molecules in something - Matter is energy that has become solid -An object gains mass when it gains more energy and vice a versa -Units: SI- kgs and USA: Slugs - lbs






36. 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






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






38. Describes how applied forces bring a body into motion






39. 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 (






40. 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






41. Piston travels up and both plugs are closed






42. 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






43. 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






44. Weight/Time






45. What we are not studying






46. 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)






47. A combination of components






48. One that pushes on an object






49. 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






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