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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. Force x Distance
Moment Arm Equation
Acceleration
Fluid Power
Velocity
2. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2
Direction of Forces
Fluids
Second Stroke (4 Stroke Engine)
Gravity
3. Modern Technology- More efficient-Better Cooling-Easier to service- longer life - lither weight- More expensive
Disc Breaks
Mechanical Advantage
Area of a circle equation
Force Equation
4. 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
Effort
Mechanical Engineering
decrease
Inclined Plane
5. Force/Area
Second Stroke (Diesel Engine)
Units for Pressure
Pressure Equation
Common Brake Characteristics
6. Mechanics is an application of math that describes how forces affect a body
Fourth Stroke (Diesel Engine)
Pythagorean Theorem
Mechanics
Area
7. What we are not studying
Hybrid Parallel
Temperature
Second Stroke (4 Stroke Engine)
Surroundings
8. 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
Fluid
Moment Arm Equation
First Stroke (2 Stroke Engine)
Mass
9. Rotation may occur
Translation
If the force is applied away from the center of rotation
Surroundings
Law of Conservation of Mass
10. A small piece that makes up a larger whole. Each component is there for a specific job - but the sum of components
Mechanics
Hydraulic Cylinders
Forces
Component
11. 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
Power Equation
Engineers and scientists need a common language
Fluid Power
12. 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
If the force is applied away from the center of rotation
Mechanical Advantage
Result of Applying a force to a rigid body at rest
Area
13. Four Stroke Engine -Used in hotter areas because more efficient -Higher compression ratio than gasoline
Steam Engine
Law of Conservation of Mass
Diesel Engine
Inclined Plane
14. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2
Acceleration
Tension
Force Equation
Common Brake Characteristics
15. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human
If the force is applied at the center of the rotation
Closed System
Shear
Base Dimensions
16. 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
Volume
Second Stroke (Diesel Engine)
Pressure
Mechanical Engineering
17. Result of gravity acting on mass -The greater the mass - the greater the weight -Is a force -Units: lbs - N
Forces and Vectors
Vectors
Base Dimensions
Weight
18. A pull on an object
Tension
Drum Brakes
Pascal's Principle
Mass
19. Can be applied:-By direct contact: push - pull - twist -At a distance: gravity - magnetism Can change: speed - direction - shape - units of force
Area
Forces
Fluid
Inclined Plane
20. Used to measure or quantify -US Common: Absolute and Gravitational -SI: absolute
Equilibrium
Fluids
Units
Machine
21. Combustion ignited by spark plug and materials are compressed
Second Stroke (rotary)
Third Stroke (4 Stroke Engine)
Hydrodynamics
Dynamics
22. Exhaust
Second Stroke (rotary)
Hydrostatics
Fourth Stroke (Diesel Engine)
will move
23. Intake of fuel and air mix
Aerodynamics
Mechanical Advantage Equation
More than one force
First Stroke (rotary)
24. 1. Magnitude: size - a numberi.e. 50 mph 2. Direction: angle i.e. N -E -W -S
Forces and Vectors
Common Brake Characteristics
Work
more than one force
25. ...
Force lets us do work on a system
Pythagorean Theorem
Dimension
Fluids
26. A^2+b^2=c^2 - used to calculate vectors
no movement
Component
Work
Pythagorean Theorem
27. 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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28. 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.
Disc Breaks
Mechanical Advantage
Mass
2 Stroke Engine
29. Force without machine/Force with machine
US Customary
Mechanical Advantage Equation
will move
Gravity
30. A fluid power system uses hydraulics and a fluid under pressure to create a greater force than is applied
Fluid Power
First Stroke (2 Stroke Engine)
Open System
Mass
31. 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
Fluid
more than one force
Mechanics describe how forces affect a body
Machine
32. 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
Mechanical Advantage Equation
Effort
Dynamics
33. The branch of science and engineering involving measurement
Metrology
Pythagorean Theorem
Mechanical Engineering
no movement
34. 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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35. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag
Equation for Mechanical Advantage regarding inclined planes
Pressure
Third Stroke (rotary)
If the force is applied at the center of the rotation
36. 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
Common Brake Characteristics
Open System
Newton's Third Law
Rotary
37. Length / Time
Area
Mechanical Advantage
Velocity
Second Stroke (4 Stroke Engine)
38. An indication of kinetic energy of mass at the molecular level
Temperature
Couple
Force lets us do work on a system
Hybrid Series
39. (Force)(Distance)/Seconds
Fluid Power
Closed System
Power Equation
no movement
40. Static - Dynamic
Effort
Fluid
Hybrid Parallel
Mechanics describe how forces affect a body
41. When the sum of all forces and the sum of all moments both equal forces - No movement
Equilibrium
System
decrease
Weight
42. Allows comparison between different measuring systems and units - Necessary to market internationally
no movement
Steam Engine
Conversions
Fluid Power
43. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment
Moment Arm
Inclined Plane
Gravity
Second Stroke (4 Stroke Engine)
44. Compression-Tension-Shear
Direction of Forces
Fourth Stroke (4 Stroke Engine)
Power Equation
Equation for Mechanical Advantage regarding inclined planes
45. When the work done by the effort just equals the work done by the load - ______ of the machine will occur
Newton's Third Law
no movement
Tension
Units for Pressure
46. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human
Second Stroke (rotary)
Hydraulic Cylinders
Dynamics
Open System
47. 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
Vectors
Fluid Power
First Stroke (2 Stroke Engine)
Internal Combustion Engine Types
48. Rotation will not occur - but translation might occur
Third Stroke (rotary)
Direction of Forces
If the force is applied at the center of the rotation
Gravity
49. When the work done by the effort exceeds the work done by the load - the load...
Volume
Weight
will move
decrease
50. Fuel is injected and combusts due to temperature of compressed air
Third Stroke (Diesel Engine)
Work
Surroundings
Volume