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Test your basic knowledge |
Mechanical Engineering
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Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
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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. Used to measure or quantify -US Common: Absolute and Gravitational -SI: absolute
Units
Fourth Stroke (Diesel Engine)
Diesel Engine
Hydraulic Cylinders
2. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid
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3. 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
Result of Applying a force to a rigid body at rest
4 Stroke Engine
Hydraulic Cylinders
Fourth Stroke (rotary)
4. Length x Width x Height
Force Equation
Equilibrium
Volume
Hybrid Parallel
5. (pi) x (radius)^2
Metrology
Area of a circle equation
Common Brake Characteristics
Fourth Stroke (Diesel Engine)
6. Exhaust of combustion products
Machine
Fourth Stroke (rotary)
Torque
Fourth Stroke (Diesel Engine)
7. Four Stroke Engine -Used in hotter areas because more efficient -Higher compression ratio than gasoline
Pascal's Principle
Forces and Vectors
Diesel Engine
Second Stroke (Diesel Engine)
8. When fluid is at rest
Hydrostatics
Metrology
2 Stroke Engine
Internal Combustion Engine Types
9. Describes how applied forces bring a body into motion
Second Stroke (rotary)
Volume
Dynamics
Pressure
10. 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
Mass
Acceleration
Disc Breaks
11. 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
Engineers and scientists need a common language
Volume
Length
Inclined Plane
12. 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 (
Dynamics
Weight
Mechanics
System International (SI)
13. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)
Acceleration
US Customary
Second Stroke (4 Stroke Engine)
Derived Dimension
14. Mass can neither by created nor destroyed - only transformed
Units for Pressure
Hydrodynamics
Law of Conservation of Mass
Equation for Mechanical Advantage regarding inclined planes
15. External Combustion engine -Only used in factories and plants (not used in cars)
Mass
will move
Units for Pressure
Steam Engine
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
no movement
Mechanical Engineering
more than one force
Forces and Vectors
17. An indication of kinetic energy of mass at the molecular level
First Stroke (4 Stroke Engine)
Second Stroke (Diesel Engine)
Couple
Temperature
18. Describes how applied forces bring a body into rest or equilibrium
Statics
Open System
Hybrid
Diesel Engine
19. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag
Applied Brakes
Dynamics
Translation
Pressure
20. A^2+b^2=c^2
System
Hybrid
Pythagorean Theorem Equation
Mechanical Advantage
21. Are independent of other dimensions - They are limited in number - length - mass - time - temperature - force
Fluid
Units for Pressure
Newton's Second Law
Base Dimensions
22. 1. Magnitude: size - a numberi.e. 50 mph 2. Direction: angle i.e. N -E -W -S
Derived Dimension
Forces and Vectors
no movement
Diesel Engine
23. Rotation will not occur - but translation might occur
Fourth Stroke (4 Stroke Engine)
Closed System
Rotary
If the force is applied at the center of the rotation
24. 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)
Dynamics
Power
Work
Fluids
25. 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
Statics
US Customary
Weight
Internal Combustion Engine Types
26. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width
Area
Second Stroke (rotary)
Statics
Units for Pressure
27. What we are studying
Mechanical Advantage Equation
System
Shear
Power Equation
28. When the work done by the effort exceeds the work done by the load - the load...
will move
Hydraulic Cylinders
4 Stroke Engine
US Customary
29. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human
Fluids
Dynamics
Metrology
Open System
30. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2
Acceleration
Pythagorean Theorem
First Stroke (rotary)
Moment Arm
31. (Force)(Distance)/Seconds
Power Equation
Hydrodynamics
2 Stroke Engine
US Customary
32. Both engines drive wheels -ICE used for cruising -Electric motor assists with low speed for acceleration and hill climbing
Velocity
Translation
Hybrid Parallel
Power Equation
33. Static - Dynamic
Mass
Dimension
Mechanics describe how forces affect a body
Fourth Stroke (Diesel Engine)
34. 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
Hydraulics
Tension
Gravity
Rotation
35. When the work done by the effort just equals the work done by the load - ______ of the machine will occur
no movement
Mechanical Advantage
Work
Pythagorean Theorem
36. Piston travels up and exhaust valve opens. Combustion by product exhaustion
System
Fourth Stroke (4 Stroke Engine)
Equilibrium
Hydraulics
37. One that pushes on an object
Compression
Units for Pressure
Engineers and scientists need a common language
Direction of Forces
38. 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.
no movement
Applied Brakes
2 Stroke Engine
Dynamics
39. Rotation may occur
Surroundings
Hydrodynamics
If the force is applied away from the center of rotation
Result of Applying a force to a rigid body at rest
40. 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
Fourth Stroke (Diesel Engine)
Mass
Mechanical Advantage
2 Stroke Engine
41. Modern Technology- More efficient-Better Cooling-Easier to service- longer life - lither weight- More expensive
Second Stroke (Diesel Engine)
Weight
Disc Breaks
System
42. Compression of fuel mix
First Stroke (rotary)
Gravity
Second Stroke (rotary)
Area Equation
43. Piston travels up and both plugs are closed
Second Stroke (4 Stroke Engine)
Torque
Fluid
Shear
44. 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
Direction of Forces
Area of a circle equation
Surroundings
Common Brake Characteristics
45. 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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46. When the moving fluid is a gas
Aerodynamics
Pythagorean Theorem Equation
Mass
Fourth Stroke (Diesel Engine)
47. Result of gravity acting on mass -The greater the mass - the greater the weight -Is a force -Units: lbs - N
Hydrodynamics
Length
Weight
Surroundings
48. Movement along a line (reciprocal or linear motion) -Units: feet and meters
Equilibrium
Drum Brakes
Mechanical Advantage
Translation
49. Ignition - power stroke
Fourth Stroke (4 Stroke Engine)
Third Stroke (rotary)
Length
Internal Combustion Engine Types
50. Air is drawn in
Hybrid Parallel
Hybrid
Acceleration
First Stroke (Diesel Engine)
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