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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. Piston travels up and both plugs are closed






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






3. 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






4. Often a free body has _______ acting on it






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






6. (Force)(Distance)/Seconds






7. Body in motion (car)






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






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






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






11. A system adopted from an old British system of units in the 13th century -Engineering system -Units: length- foot (ft) - time- second (s) - force-(lbs) - Mass is a derived unit called a slug -Political/Economic choice -Awkward






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






13. Mass can neither by created nor destroyed - only transformed






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






15. When the fluid is in motion






16. Length x Width x Height






17. 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






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






19. When the moving fluid is a gas






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






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






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






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






24. Combustion of fuel mixture ignited by spark plug






25. Air is drawn in






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






27. Dimensions and units






28. Exhaust of combustion products






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






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






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






33. Compression-Tension-Shear






34. Intake of fuel and air mix






35. One that pushes on an object






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






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






38. 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






39. 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






40. External Combustion engine -Only used in factories and plants (not used in cars)






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






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






43. 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






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






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






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






47. Applied at an angle or parallel to a surface






48. Length / Time






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






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







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