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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. 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
First Stroke (4 Stroke Engine)
Open System
Moment Arm Equation
Mechanical Engineering
2. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2
Units for Pressure
More than one force
Acceleration
Fluid Power
3. 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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4. Air is compressed - work is done on the system
Compression
US Customary
Third Stroke (Diesel Engine)
Second Stroke (Diesel Engine)
5. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human
Power Equation
Direction of Forces
First Stroke (2 Stroke Engine)
Open System
6. When the moving fluid is a gas
Newton's First Law of Motion
Power
Force lets us do work on a system
Aerodynamics
7. Body at rest or is in equilibrium (wall)
Power Equation
Static
Pressure Equation
4 Stroke Engine
8. When the fluid is in motion
Acceleration
First Stroke (rotary)
Hydrodynamics
Units for Pressure
9. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq
Disc Breaks
Volume
Hydraulics
Direction of Forces
10. Four Stroke Engine -Used in hotter areas because more efficient -Higher compression ratio than gasoline
Pythagorean Theorem Equation
Diesel Engine
System
Static
11. 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
System
Surroundings
Rotary
Pythagorean Theorem Equation
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
System
Hybrid Parallel
Mechanical Advantage
Tension
13. A movement around a central pivot point (rotational movement) -Units: revolutions per second (rps) and revolutions per minute (rpm)
Tension
Gravity
Rotation
Fourth Stroke (rotary)
14. A^2+b^2=c^2
Pythagorean Theorem Equation
Third Stroke (Diesel Engine)
First Stroke (2 Stroke Engine)
Temperature
15. Mechanics is an application of math that describes how forces affect a body
no movement
Mechanics
Forces
Fourth Stroke (Diesel Engine)
16. 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
Fourth Stroke (4 Stroke Engine)
Power Equation
Fluid Power
Hybrid
17. Force/Area
Closed System
Newton's First Law of Motion
First Stroke (Diesel Engine)
Pressure Equation
18. Piston travels up and both plugs are closed
Fluids
more than one force
Second Stroke (4 Stroke Engine)
Area of a circle equation
19. Exhaust
will move
Fluids
Result of Applying a force to a rigid body at rest
Fourth Stroke (Diesel Engine)
20. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag
no movement
Pascal's Principle
Gravity
Pressure
21. Length x Width
Power
Fourth Stroke (4 Stroke Engine)
Area Equation
First Stroke (2 Stroke Engine)
22. 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)
Second Stroke (Diesel Engine)
First Stroke (2 Stroke Engine)
Power
Fourth Stroke (rotary)
23. Can be applied at a time on an object
Direction of Forces
More than one force
Dynamics
Force lets us do work on a system
24. Mass can neither by created nor destroyed - only transformed
Force lets us do work on a system
Mass
Law of Conservation of Mass
Static
25. ...
If the force is applied at the center of the rotation
Force lets us do work on a system
Fluids
Metrology
26. Compression of fuel mix
Second Stroke (rotary)
Couple
System International (SI)
Mechanical Advantage
27. When the work done by the effort just equals the work done by the load - ______ of the machine will occur
Vectors
no movement
First Stroke (2 Stroke Engine)
Rotation
28. One that pushes on an object
Base Dimensions
Temperature
Vectors
Compression
29. Rotation will not occur - but translation might occur
Steam Engine
Engineers and scientists need a common language
If the force is applied at the center of the rotation
Direction of Forces
30. Fuel is injected and combusts due to temperature of compressed air
Power Equation
Equilibrium
Gravity
Third Stroke (Diesel Engine)
31. When a simple machine increases a force it is at the expense of a ____ in the distance the load is moved
Direction of Forces
Metrology
decrease
Units for Pressure
32. 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
Work
Engineers and scientists need a common language
If the force is applied away from the center of rotation
Hydrodynamics
33. Length / Time
Hydrodynamics
Mass
Velocity
Moment Arm Equation
34. Describes a physical property of anything - What we are measuring
Newton's Second Law
Dimension
Closed System
Pressure
35. Mass x acceleration
If the force is applied away from the center of rotation
First Stroke (2 Stroke Engine)
Force Equation
no movement
36. Liquid or gas
Effort
Engineers and scientists need a common language
Fluid
Common Brake Characteristics
37. When the work done by the effort exceeds the work done by the load - the load...
Pascal's Principle
Pythagorean Theorem
will move
Third Stroke (4 Stroke Engine)
38. Describes how applied forces bring a body into rest or equilibrium
Statics
Mechanical Advantage Equation
Rotary
Engineers and scientists need a common language
39. 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
Inclined Plane
Torque
Dynamics
Pressure
40. Same pressure - work - volume - Different forces and distances
Machine
First Stroke (4 Stroke Engine)
Hydraulic Cylinders
Equation for Mechanical Advantage regarding inclined planes
41. Piston travels down and intake valve is opened. Intake of fuel and air into chamber
Mass
First Stroke (4 Stroke Engine)
Second Stroke (rotary)
Fourth Stroke (Diesel Engine)
42. Result of gravity acting on mass -The greater the mass - the greater the weight -Is a force -Units: lbs - N
Weight
Power
System
Fluid Power
43. When fluid is at rest
Hydrostatics
Direction of Forces
4 Stroke Engine
no movement
44. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width
Area of a circle equation
First Stroke (4 Stroke Engine)
Area
Fourth Stroke (Diesel Engine)
45. 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.
Effort
Disc Breaks
Hydraulic Cylinders
2 Stroke Engine
46. Combustion of fuel mixture ignited by spark plug
Area Equation
Second Stroke (2 Stroke Engine)
Mechanical Advantage
Fluids
47. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous
will move
Volume
Pythagorean Theorem
Moment Arm Equation
48. 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
4 Stroke Engine
Torque
Component
Common Brake Characteristics
49. A fluid power system uses hydraulics and a fluid under pressure to create a greater force than is applied
Units for Pressure
Mass
Fluid Power
Surroundings
50. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2
Fluid
Gravity
Hydraulic Cylinders
Conversions