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Test your basic knowledge |
Mechanical Engineering
Start Test
Study First
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. Exhaust of combustion products
Fluid
Units
Fourth Stroke (rotary)
Open System
2. What we are studying
Surroundings
will move
Pressure Equation
System
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 Stroke Engine
Pressure Equation
Dimension
decrease
4. External Combustion engine -Only used in factories and plants (not used in cars)
Applied Brakes
Gravity
Steam Engine
Temperature
5. 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.
Area Equation
Conversions
Power Equation
2 Stroke Engine
6. 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
Hydraulics
Hydrostatics
Fourth Stroke (rotary)
Common Brake Characteristics
7. Are independent of other dimensions - They are limited in number - length - mass - time - temperature - force
Units for Pressure
Hydraulic Cylinders
Temperature
Base Dimensions
8. (Force)(Distance)/Seconds
Gravity
Direction of Forces
Second Stroke (Diesel Engine)
Power Equation
9. ...
Static
Power Equation
Force lets us do work on a system
Steam Engine
10. When the work done by the effort exceeds the work done by the load - the load...
Base Dimensions
Second Stroke (Diesel Engine)
First Stroke (2 Stroke Engine)
will move
11. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous
no movement
Vectors
Units
Pythagorean Theorem
12. Static - Dynamic
Mechanics describe how forces affect a body
Newton's First Law of Motion
First Stroke (rotary)
If the force is applied at the center of the rotation
13. Incompressible (volume doesnt change) Transmit force evenly - Lubricates - Trap contaminants - Some based on vegetable oils - Biodegradable - Aircraft fluids noncombustible (thins as temperature rises)
Fluids
Metrology
Power
Mechanics describe how forces affect a body
14. Allows comparison between different measuring systems and units - Necessary to market internationally
Hybrid
Conversions
Hydraulics
Diesel Engine
15. Rotation will not occur - but translation might occur
Translation
If the force is applied at the center of the rotation
Area of a circle equation
Newton's Third Law
16. 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)
Power Equation
Work
Power
Mass
17. 1. Magnitude: size - a numberi.e. 50 mph 2. Direction: angle i.e. N -E -W -S
Effort
Forces and Vectors
Second Stroke (2 Stroke Engine)
Units
18. A movement around a central pivot point (rotational movement) -Units: revolutions per second (rps) and revolutions per minute (rpm)
Rotation
Work
Power
Equation for Mechanical Advantage regarding inclined planes
19. Length / Time
Mechanics
If the force is applied away from the center of rotation
Hydraulics
Velocity
20. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)
Force Equation
Derived Dimension
Third Stroke (rotary)
Temperature
21. When the moving fluid is a gas
Statics
Volume
Aerodynamics
Pythagorean Theorem
22. Three- dimensional property measured in units of length times length times length =length x width x height
Newton's Second Law
Power
Third Stroke (Diesel Engine)
Volume
23. Air is drawn in
Steam Engine
First Stroke (Diesel Engine)
Pythagorean Theorem Equation
Units
24. Intake of fuel and air mix
First Stroke (rotary)
Newton's Second Law
First Stroke (4 Stroke Engine)
Forces
25. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width
Second Stroke (2 Stroke Engine)
Hydraulic Cylinders
Volume
Area
26. Body in motion (car)
Closed System
Disc Breaks
Dynamics
Hybrid Series
27. 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
Weight
Mass
Work
Hydrodynamics
28. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid
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29. 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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30. 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
Rotary
Gravity
Torque
Pascal's Principle
31. Mass can neither by created nor destroyed - only transformed
Disc Breaks
Surroundings
Law of Conservation of Mass
Force Equation
32. Psi - newtons - pascals
Second Stroke (4 Stroke Engine)
System International (SI)
Units for Pressure
Moment Arm
33. Compression of fuel mix
Second Stroke (rotary)
Second Stroke (Diesel Engine)
Third Stroke (Diesel Engine)
Pascal's Principle
34. Applied at an angle or parallel to a surface
Gravity
First Stroke (rotary)
Shear
Hybrid Series
35. When the fluid is in motion
Hydrodynamics
decrease
Second Stroke (2 Stroke Engine)
Units for Pressure
36. Result of gravity acting on mass -The greater the mass - the greater the weight -Is a force -Units: lbs - N
Mechanics describe how forces affect a body
Weight
Third Stroke (rotary)
Hydraulic Cylinders
37. Piston travels up and both plugs are closed
Second Stroke (4 Stroke Engine)
4 Stroke Engine
Hybrid Parallel
Conversions
38. Rotation may occur
Power Equation
Dynamics
If the force is applied away from the center of rotation
Diesel Engine
39. Dimensions and units
Velocity
US Customary
Area Equation
Engineers and scientists need a common language
40. Often a free body has _______ acting on it
Second Stroke (rotary)
more than one force
Third Stroke (rotary)
Area Equation
41. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2
Gravity
Newton's Second Law
Dynamics
Engineers and scientists need a common language
42. Can be applied at a time on an object
More than one force
Third Stroke (4 Stroke Engine)
Newton's First Law of Motion
Fluid Power
43. Weight/Time
Power Equation
Closed System
Temperature
Second Stroke (Diesel Engine)
44. 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
Dimension
Machine
Mechanical Advantage
Rotation
45. When fluid is at rest
Hydrostatics
Third Stroke (rotary)
Mechanical Advantage
Pressure Equation
46. Old technology- harder to service-Still used on big trucks and trailers because they are too expensive to convert
Aerodynamics
Area of a circle equation
Fluid Power
Drum Brakes
47. Mechanics is an application of math that describes how forces affect a body
System International (SI)
Mechanics
Forces and Vectors
Steam Engine
48. When the work done by the effort just equals the work done by the load - ______ of the machine will occur
First Stroke (rotary)
Statics
no movement
Mechanics describe how forces affect a body
49. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2
Mechanics
Disc Breaks
Acceleration
Dimension
50. 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
Mechanics
Work
Third Stroke (4 Stroke Engine)
Mechanical Advantage