Test your basic knowledge |

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. Work/force or vertical distance/sloping distance






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






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






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






6. 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






7. Length / Time






8. 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






9. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us


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






11. 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






12. 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.






13. The branch of science and engineering involving measurement






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






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






16. 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


17. A pull on an object






18. Static - Dynamic






19. Liquid or gas






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






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






22. Mass x acceleration






23. Body in motion (car)






24. Describes how applied forces bring a body into motion






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






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






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






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






29. 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






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






31. 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)






32. Combustion ignited by spark plug and materials are compressed






33. Often a free body has _______ acting on it






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






35. What we are not studying






36. ...






37. 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






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






39. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid


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






41. When the moving fluid is a gas






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






43. Force/Area






44. 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






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






46. 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






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






48. Combustion of fuel mixture ignited by spark plug






49. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag






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