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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
System
Hydraulics
Velocity
Acceleration
2. 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
First Stroke (2 Stroke Engine)
Common Brake Characteristics
Rotary
Metrology
3. Are independent of other dimensions - They are limited in number - length - mass - time - temperature - force
System
Metrology
Dimension
Base Dimensions
4. An indication of kinetic energy of mass at the molecular level
Hydrodynamics
Temperature
Direction of Forces
Mechanical Advantage Equation
5. Applied at an angle or parallel to a surface
Equilibrium
Pythagorean Theorem Equation
Shear
Fluid
6. The force simple machines use to do work on a single load or against a single force
Effort
Hybrid Parallel
Fourth Stroke (rotary)
Shear
7. Translation (slide) -Rotate -Slide and Rotate Together
4 Stroke Engine
Hybrid
Area Equation
Result of Applying a force to a rigid body at rest
8. Four Stroke Engine -Used in hotter areas because more efficient -Higher compression ratio than gasoline
Diesel Engine
4 Stroke Engine
Forces
Acceleration
9. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human
System International (SI)
Gravity
Mechanical Advantage Equation
Closed System
10. ICE generates electricity for electric battery -Electric motor turns wheels
Third Stroke (Diesel Engine)
Hybrid Series
will move
Pythagorean Theorem
11. One that pushes on an object
Hydrostatics
Tension
Inclined Plane
Compression
12. Used to measure or quantify -US Common: Absolute and Gravitational -SI: absolute
Pressure
Diesel Engine
Units
Disc Breaks
13. Intake of fuel and air mix
First Stroke (rotary)
Area
Rotation
Drum Brakes
14. Body in motion (car)
Power
Dynamics
Metrology
Forces and Vectors
15. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment
Newton's Second Law
First Stroke (4 Stroke Engine)
Dynamics
Moment Arm
16. A fluid power system uses hydraulics and a fluid under pressure to create a greater force than is applied
Third Stroke (Diesel Engine)
no movement
Volume
Fluid Power
17. When the moving fluid is a gas
Newton's First Law of Motion
Aerodynamics
Pressure Equation
Force lets us do work on a system
18. Can be applied at a time on an object
decrease
Moment Arm Equation
2 Stroke Engine
More than one force
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)
Surroundings
2 Stroke Engine
Power
Effort
20. Body at rest or is in equilibrium (wall)
Hybrid
Second Stroke (Diesel Engine)
Pythagorean Theorem
Static
21. Ignition - power stroke
Third Stroke (rotary)
System International (SI)
Surroundings
Fluids
22. Two stroke- Four Stroke- Diesel-Rotary -Hybrid
Internal Combustion Engine Types
Pascal's Principle
Rotary
Second Stroke (2 Stroke Engine)
23. Work/force or vertical distance/sloping distance
Power Equation
Shear
Metrology
Equation for Mechanical Advantage regarding inclined planes
24. 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
First Stroke (rotary)
Common Brake Characteristics
Dynamics
decrease
25. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2
Gravity
Result of Applying a force to a rigid body at rest
Open System
no movement
26. Fuel is injected and combusts due to temperature of compressed air
Fluid
First Stroke (4 Stroke Engine)
Steam Engine
Third Stroke (Diesel Engine)
27. Result of gravity acting on mass -The greater the mass - the greater the weight -Is a force -Units: lbs - N
Metrology
Weight
Pressure Equation
Forces
28. Length x Width
Mass
Newton's First Law of Motion
Area Equation
Temperature
29. A^2+b^2=c^2 - used to calculate vectors
Area
Force lets us do work on a system
Pythagorean Theorem
Pressure
30. When two parallel forces equal in magnitude and opposite direction - i.e. steering wheel - turn a know - turn on and off a faucet
Surroundings
Length
First Stroke (4 Stroke Engine)
Couple
31. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us
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32. Allows comparison between different measuring systems and units - Necessary to market internationally
Conversions
Effort
Volume
Power Equation
33. When the work done by the effort just equals the work done by the load - ______ of the machine will occur
no movement
First Stroke (rotary)
Aerodynamics
Diesel Engine
34. 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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35. Can be applied:-By direct contact: push - pull - twist -At a distance: gravity - magnetism Can change: speed - direction - shape - units of force
Disc Breaks
Forces
Volume
decrease
36. Old technology- harder to service-Still used on big trucks and trailers because they are too expensive to convert
Conversions
Drum Brakes
Surroundings
Moment Arm Equation
37. Exhaust
First Stroke (rotary)
Fourth Stroke (Diesel Engine)
more than one force
Compression
38. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width
Mechanics describe how forces affect a body
Area
Equation for Mechanical Advantage regarding inclined planes
Mechanical Advantage
39. Compression-Tension-Shear
Direction of Forces
Fluid
First Stroke (rotary)
Pythagorean Theorem Equation
40. The magnitude of something in a particular direction
more than one force
Area Equation
Length
Dynamics
41. External Combustion engine -Only used in factories and plants (not used in cars)
Pascal's Principle
First Stroke (rotary)
Steam Engine
Hybrid Series
42. Piston travels up and both plugs are closed
Equilibrium
Second Stroke (Diesel Engine)
Work
Second Stroke (4 Stroke Engine)
43. When fluid is at rest
First Stroke (2 Stroke Engine)
Hydrostatics
Third Stroke (Diesel Engine)
US Customary
44. Combustion ignited by spark plug and materials are compressed
Compression
Third Stroke (4 Stroke Engine)
Steam Engine
Component
45. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)
Third Stroke (Diesel Engine)
Units
Derived Dimension
Temperature
46. 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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47. Weight/Time
Applied Brakes
Power Equation
Effort
Metrology
48. 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
US Customary
Pressure Equation
Component
Dimension
49. Same pressure - work - volume - Different forces and distances
System International (SI)
Inclined Plane
First Stroke (4 Stroke Engine)
Hydraulic Cylinders
50. Force/Area
Mechanical Advantage
Pressure Equation
Weight
Hybrid