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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. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2
Area of a circle equation
Hydraulics
Aerodynamics
Acceleration
2. 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
Mechanical Advantage
Units
Mechanics describe how forces affect a body
Mechanics
3. Incompressible (volume doesnt change) Transmit force evenly - Lubricates - Trap contaminants - Some based on vegetable oils - Biodegradable - Aircraft fluids noncombustible (thins as temperature rises)
Fluids
Rotary
Mechanical Advantage Equation
US Customary
4. 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.
Equilibrium
Second Stroke (2 Stroke Engine)
2 Stroke Engine
Fourth Stroke (Diesel Engine)
5. 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
Open System
4 Stroke Engine
Area Equation
Pythagorean Theorem Equation
6. Compression-Tension-Shear
Direction of Forces
Common Brake Characteristics
First Stroke (4 Stroke Engine)
Machine
7. Movement along a line (reciprocal or linear motion) -Units: feet and meters
Translation
Applied Brakes
Hydraulics
Fourth Stroke (Diesel Engine)
8. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width
Statics
Area
Drum Brakes
Temperature
9. The standard system of units that uses base 10 and used in the rest of the world. US does not use - but Great Britain does - Base Units: mass - kilograms (kg) - length- meters (m) - and time-Seconds (S) - Force is a derived unit measured in newtons (
Compression
More than one force
Units
System International (SI)
10. Air is drawn in
Base Dimensions
First Stroke (2 Stroke Engine)
Surroundings
First Stroke (Diesel Engine)
11. Same pressure - work - volume - Different forces and distances
If the force is applied at the center of the rotation
Pascal's Principle
Hydraulic Cylinders
Aerodynamics
12. Result of gravity acting on mass -The greater the mass - the greater the weight -Is a force -Units: lbs - N
Third Stroke (Diesel Engine)
Weight
Component
Moment Arm
13. 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
Volume
Equation for Mechanical Advantage regarding inclined planes
US Customary
Work
14. Mechanics is an application of math that describes how forces affect a body
Metrology
First Stroke (2 Stroke Engine)
Mechanics
First Stroke (Diesel Engine)
15. 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
Units
First Stroke (4 Stroke Engine)
Third Stroke (4 Stroke Engine)
Machine
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
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17. Allows comparison between different measuring systems and units - Necessary to market internationally
Area of a circle equation
Forces and Vectors
Conversions
Rotation
18. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid
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19. Piston travels up and both plugs are closed
Second Stroke (rotary)
Pascal's Principle
Second Stroke (4 Stroke Engine)
System International (SI)
20. Varies by location (on earth) - distance (from earth) - and mass (of planet)
Pythagorean Theorem
Gravity
4 Stroke Engine
Drum Brakes
21. A^2+b^2=c^2 - used to calculate vectors
Common Brake Characteristics
Compression
Pythagorean Theorem
Dimension
22. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment
Derived Dimension
Moment Arm
Translation
Rotation
23. Rotation will not occur - but translation might occur
Hydraulic Cylinders
Moment Arm Equation
Conversions
If the force is applied at the center of the rotation
24. 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
Hybrid
First Stroke (Diesel Engine)
Pythagorean Theorem Equation
Component
25. (Force)(Distance)/Seconds
Hybrid
Shear
US Customary
Power Equation
26. The force simple machines use to do work on a single load or against a single force
US Customary
Closed System
Dynamics
Effort
27. When two parallel forces equal in magnitude and opposite direction - i.e. steering wheel - turn a know - turn on and off a faucet
Mechanics describe how forces affect a body
Result of Applying a force to a rigid body at rest
Couple
Moment Arm
28. Force x Distance
Moment Arm Equation
Area Equation
Hybrid
Open System
29. What we are studying
System
System International (SI)
Velocity
Hybrid Series
30. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag
Volume
Pressure
Diesel Engine
System
31. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)
Derived Dimension
Applied Brakes
Force lets us do work on a system
Inclined Plane
32. 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
Shear
Second Stroke (4 Stroke Engine)
Newton's Second Law
33. Length / Time
2 Stroke Engine
Mass
Velocity
Second Stroke (4 Stroke Engine)
34. Describes how applied forces bring a body into motion
Statics
Machine
Dynamics
If the force is applied away from the center of rotation
35. Often a free body has _______ acting on it
Volume
First Stroke (2 Stroke Engine)
more than one force
Force lets us do work on a system
36. 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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37. Length x Width
Conversions
no movement
Area Equation
Derived Dimension
38. Length x Width x Height
Torque
Force Equation
Temperature
Volume
39. Ignition - power stroke
Moment Arm Equation
Third Stroke (rotary)
Result of Applying a force to a rigid body at rest
Third Stroke (Diesel Engine)
40. Liquid or gas
Component
Fluid
Statics
Steam Engine
41. If a force causes rotations -Vector- Machines can have more than one torque-Units: foot- pound and newton - meter - i.e. engines - airplanes - propeller
Torque
Mass
Rotary
Newton's First Law of Motion
42. Are independent of other dimensions - They are limited in number - length - mass - time - temperature - force
Derived Dimension
Mechanical Engineering
Area of a circle equation
Base Dimensions
43. Modern Technology- More efficient-Better Cooling-Easier to service- longer life - lither weight- More expensive
Surroundings
Dynamics
Fluid
Disc Breaks
44. Weight/Time
Power Equation
Velocity
Hydraulics
First Stroke (2 Stroke Engine)
45. A small piece that makes up a larger whole. Each component is there for a specific job - but the sum of components
Hybrid Series
Component
Hydrodynamics
Acceleration
46. The magnitude of something in a particular direction
Length
Hydraulic Cylinders
US Customary
Shear
47. A combination of components
Area of a circle equation
Fluid
System
Hydrodynamics
48. Dimensions and units
Rotation
If the force is applied away from the center of rotation
Mechanics
Engineers and scientists need a common language
49. Both engines drive wheels -ICE used for cruising -Electric motor assists with low speed for acceleration and hill climbing
Hybrid Series
System
System
Hybrid Parallel
50. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human
Fluid Power
Rotation
Open System
Fourth Stroke (4 Stroke Engine)