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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. 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






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






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






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






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






7. Describes a physical property of anything - What we are measuring






8. Compression of fuel mix






9. When the moving fluid is a gas






10. 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.






11. Force x Distance






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






13. 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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14. The magnitude of something in a particular direction






15. Rotation will not occur - but translation might occur






16. Liquid or gas






17. Combustion ignited by spark plug and materials are compressed






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






19. Static - Dynamic






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






21. Exhaust






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






23. Often a free body has _______ acting on it






24. Ignition - power stroke






25. When fluid is at rest






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






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






28. 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 (






29. Body at rest or is in equilibrium (wall)






30. Combustion of fuel mixture ignited by spark plug






31. 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






32. Length x Width






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






34. 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






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






36. 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






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






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






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






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






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






42. 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






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






44. One that pushes on an object






45. Length / Time






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






47. Applied at an angle or parallel to a surface






48. (pi) x (radius)^2






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






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