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Mechanical Engineering

Subject : engineering
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. Often a free body has _______ acting on it

2. Exhaust

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

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

5. Liquid or gas

6. 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

7. 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

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

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

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

11. Combustion of fuel mixture ignited by spark plug

12. The branch of science and engineering involving measurement

13. Compression of fuel mix

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

15. Rotation will not occur - but translation might occur

16. 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

17. Length / Time

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

19. 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)

20. What we are not studying

21. 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.

22. Length x Width

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

24. A pull on an object

25. 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

26. Rotation may occur

27. Psi - newtons - pascals

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

29. (pi) x (radius)^2

30. 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

31. 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

32. Length x Width x Height

33. 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

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

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

36. Static - Dynamic

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

38. What we are studying

39. Describes how applied forces bring a body into motion

40. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq

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

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

43. 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

44. 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

45. Compression-Tension-Shear

46. When fluid is at rest

47. When the moving fluid is a gas

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

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

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