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






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






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






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






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






6. 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






7. 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 (






8. Compression of fuel mix






9. When two parallel forces equal in magnitude and opposite direction - i.e. steering wheel - turn a know - turn on and off a faucet






10. Dimensions and units






11. 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.






12. One that pushes on an object






13. Can be applied at a time on an object






14. 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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15. 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






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






17. Air is drawn in






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






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






20. Intake of fuel and air mix






21. A combination of components






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






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






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






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






26. Body in motion (car)






27. 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






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






29. Rotation may occur






30. 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






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






32. Force without machine/Force with machine






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






34. Piston travels up and both plugs are closed






35. Piston travels down and intake valve is opened. Intake of fuel and air into chamber






36. 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






37. 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






38. What we are not studying






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






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






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






42. A pull on an object






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






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






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






46. ICE generates electricity for electric battery -Electric motor turns wheels






47. Exhaust of combustion products






48. Force x Distance






49. Often a free body has _______ acting on it






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