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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
Pythagorean Theorem
Steam Engine
Pythagorean Theorem
Fourth Stroke (rotary)
2. Weight/Time
Power Equation
If the force is applied away from the center of rotation
Derived Dimension
Mechanical Engineering
3. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width
Area
Volume
Forces
Torque
4. Static - Dynamic
4 Stroke Engine
Moment Arm Equation
Mechanics describe how forces affect a body
Volume
5. 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
Newton's Third Law
Area Equation
Moment Arm
6. A pull on an object
Tension
Pressure
Area Equation
Mechanical Advantage Equation
7. 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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8. Mass can neither by created nor destroyed - only transformed
Law of Conservation of Mass
System International (SI)
Conversions
If the force is applied away from the center of rotation
9. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human
Equilibrium
Component
Open System
First Stroke (4 Stroke Engine)
10. When the work done by the effort exceeds the work done by the load - the load...
First Stroke (2 Stroke Engine)
Statics
Gravity
will move
11. A^2+b^2=c^2
Mechanical Advantage
Pythagorean Theorem Equation
Drum Brakes
Gravity
12. A small piece that makes up a larger whole. Each component is there for a specific job - but the sum of components
Third Stroke (rotary)
Forces and Vectors
Newton's Third Law
Component
13. A fluid power system uses hydraulics and a fluid under pressure to create a greater force than is applied
Hydraulic Cylinders
Newton's Third Law
Fluid Power
First Stroke (Diesel Engine)
14. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid
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15. 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.
Third Stroke (4 Stroke Engine)
2 Stroke Engine
Fluids
Pythagorean Theorem Equation
16. 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
First Stroke (2 Stroke Engine)
Vectors
4 Stroke Engine
Gravity
17. 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
Mechanics
Inclined Plane
Second Stroke (2 Stroke Engine)
If the force is applied at the center of the rotation
18. External Combustion engine -Only used in factories and plants (not used in cars)
Moment Arm Equation
Steam Engine
Work
System
19. Translation (slide) -Rotate -Slide and Rotate Together
2 Stroke Engine
Result of Applying a force to a rigid body at rest
Surroundings
Third Stroke (4 Stroke Engine)
20. Psi - newtons - pascals
Torque
Applied Brakes
Engineers and scientists need a common language
Units for Pressure
21. Mechanics is an application of math that describes how forces affect a body
Area Equation
4 Stroke Engine
Pressure Equation
Mechanics
22. Three- dimensional property measured in units of length times length times length =length x width x height
Volume
First Stroke (rotary)
System International (SI)
Third Stroke (4 Stroke Engine)
23. Force without machine/Force with machine
Dimension
Temperature
Static
Mechanical Advantage Equation
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
Pascal's Principle
Units
Newton's Third Law
Common Brake Characteristics
25. When a simple machine increases a force it is at the expense of a ____ in the distance the load is moved
Disc Breaks
decrease
Pressure
Length
26. 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
First Stroke (rotary)
Metrology
Weight
27. What we are not studying
Power Equation
Surroundings
Mechanical Advantage
Mechanics describe how forces affect a body
28. The magnitude of something in a particular direction
Pascal's Principle
Length
Component
Force lets us do work on a system
29. The branch of science and engineering involving measurement
Fourth Stroke (Diesel Engine)
Closed System
Newton's First Law of Motion
Metrology
30. Force/Area
Pressure Equation
If the force is applied at the center of the rotation
Newton's Second Law
Component
31. 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)
Third Stroke (rotary)
Power
Dimension
Work
32. 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
Newton's First Law of Motion
Applied Brakes
Newton's Second Law
Shear
33. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2
Acceleration
If the force is applied away from the center of rotation
Dimension
Third Stroke (rotary)
34. 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
Steam Engine
Equilibrium
Mechanical Advantage
Hybrid
35. Fuel is injected and combusts due to temperature of compressed air
Velocity
Newton's Third Law
Third Stroke (Diesel Engine)
no movement
36. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2
Rotary
Rotation
Equation for Mechanical Advantage regarding inclined planes
Gravity
37. Two stroke- Four Stroke- Diesel-Rotary -Hybrid
Rotation
Internal Combustion Engine Types
Weight
Couple
38. Length x Width
Power
Power Equation
Area Equation
Forces
39. Allows comparison between different measuring systems and units - Necessary to market internationally
Volume
Conversions
Third Stroke (Diesel Engine)
Volume
40. Body at rest or is in equilibrium (wall)
Static
Second Stroke (Diesel Engine)
more than one force
Mechanical Advantage
41. Piston travels up and exhaust valve opens. Combustion by product exhaustion
Tension
Mechanical Advantage
Forces
Fourth Stroke (4 Stroke Engine)
42. Used to measure or quantify -US Common: Absolute and Gravitational -SI: absolute
Gravity
Units
Result of Applying a force to a rigid body at rest
Pressure Equation
43. When the work done by the effort just equals the work done by the load - ______ of the machine will occur
Common Brake Characteristics
Fourth Stroke (Diesel Engine)
no movement
Second Stroke (rotary)
44. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human
Closed System
Hydrodynamics
Area
Dynamics
45. Air is compressed - work is done on the system
Second Stroke (Diesel Engine)
Fluids
Hybrid
First Stroke (2 Stroke Engine)
46. 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
Mechanical Engineering
Internal Combustion Engine Types
Component
Rotary
47. 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
Weight
Pascal's Principle
4 Stroke Engine
First Stroke (4 Stroke Engine)
48. Rotation may occur
Fourth Stroke (rotary)
If the force is applied away from the center of rotation
Temperature
Hybrid Series
49. Length / Time
Component
Result of Applying a force to a rigid body at rest
Fluid Power
Velocity
50. Combustion of fuel mixture ignited by spark plug
Hybrid Parallel
Common Brake Characteristics
Second Stroke (2 Stroke Engine)
Length