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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 quantity that has both magnitude and direction when placed within a coordinate system -Forces and Velocity i.e. driving 50 miles to the northeast






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






3. 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






4. Piston travels up and both plugs are closed






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. Exhaust






7. ...






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






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






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






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






12. 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






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






14. Combustion ignited by spark plug and materials are compressed






15. Liquid or gas






16. Mass x acceleration






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






18. Exhaust of combustion products






19. 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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20. Applied at an angle or parallel to a surface






21. What we are studying






22. 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






23. 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






24. 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






25. 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






26. Rotation may occur






27. When a simple machine increases a force it is at the expense of a ____ in the distance the load is moved






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






29. Can be applied at a time on an object






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






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






32. Often a free body has _______ acting on it






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






34. Work/force or vertical distance/sloping distance






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






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






37. 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 (






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






39. Length x Width






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






41. 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)






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






43. 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






44. A^2+b^2=c^2 - used to calculate vectors






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






46. Static - Dynamic






47. Psi - newtons - pascals






48. (pi) x (radius)^2






49. A combination of components






50. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous