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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 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






2. Mass x acceleration






3. 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






4. Static - Dynamic






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






6. Rotation will not occur - but translation might occur






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






8. 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






9. Can be applied at a time on an object






10. (pi) x (radius)^2






11. 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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12. 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






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






14. Dimensions and units






15. 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






16. A combination of components






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






18. When the moving fluid is a gas






19. What we are studying






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






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






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






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






25. Force without machine/Force with machine






26. Work/force or vertical distance/sloping distance






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






28. A pull on an object






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






30. Weight/Time






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






32. Compression-Tension-Shear






33. Force x Distance






34. The magnitude of something in a particular direction






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






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






37. Psi - newtons - pascals






38. 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






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






40. Length x Width x Height






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






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






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. 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






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






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






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






48. ...






49. 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






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