SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
Search
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. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human
Newton's First Law of Motion
Newton's Second Law
More than one force
Closed System
2. Work/force or vertical distance/sloping distance
First Stroke (rotary)
Equation for Mechanical Advantage regarding inclined planes
Hybrid
Diesel Engine
3. Modern Technology- More efficient-Better Cooling-Easier to service- longer life - lither weight- More expensive
4 Stroke Engine
Mechanics describe how forces affect a body
Disc Breaks
Newton's First Law of Motion
4. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2
Gravity
Pythagorean Theorem
Effort
Vectors
5. When a simple machine increases a force it is at the expense of a ____ in the distance the load is moved
Law of Conservation of Mass
Pythagorean Theorem
Third Stroke (rotary)
decrease
6. 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
Statics
2 Stroke Engine
Mechanical Advantage
Third Stroke (rotary)
7. Length / Time
Newton's Second Law
Area of a circle equation
Drum Brakes
Velocity
8. 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
Newton's First Law of Motion
Hydrostatics
4 Stroke Engine
Mechanical Engineering
9. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us
10. Fuel is injected and combusts due to temperature of compressed air
Third Stroke (Diesel Engine)
Static
Direction of Forces
Volume
11. 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
Hydraulic Cylinders
Weight
Force Equation
Hybrid
12. 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.
Force lets us do work on a system
2 Stroke Engine
Pressure
Gravity
13. The branch of science and engineering involving measurement
Second Stroke (rotary)
Metrology
Equation for Mechanical Advantage regarding inclined planes
If the force is applied away from the center of rotation
14. Piston travels up and exhaust valve opens. Combustion by product exhaustion
System
Force lets us do work on a system
Fourth Stroke (4 Stroke Engine)
Fluids
15. Body at rest or is in equilibrium (wall)
Moment Arm Equation
Work
Static
Area Equation
16. 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
17. A pull on an object
Couple
Tension
Mass
Second Stroke (Diesel Engine)
18. Static - Dynamic
More than one force
will move
Dynamics
Mechanics describe how forces affect a body
19. Liquid or gas
Fourth Stroke (4 Stroke Engine)
Area of a circle equation
Hybrid Parallel
Fluid
20. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human
Pressure Equation
Mechanical Advantage
Open System
Third Stroke (4 Stroke Engine)
21. Mass can neither by created nor destroyed - only transformed
More than one force
Effort
Moment Arm Equation
Law of Conservation of Mass
22. Mass x acceleration
Force Equation
Mechanics describe how forces affect a body
Base Dimensions
Second Stroke (rotary)
23. Body in motion (car)
Power Equation
Mechanical Engineering
Rotation
Dynamics
24. Describes how applied forces bring a body into motion
Dynamics
Third Stroke (4 Stroke Engine)
Metrology
Pythagorean Theorem
25. Air is compressed - work is done on the system
Second Stroke (Diesel Engine)
Pythagorean Theorem Equation
Volume
4 Stroke Engine
26. When the sum of all forces and the sum of all moments both equal forces - No movement
4 Stroke Engine
Equilibrium
Gravity
Hybrid Series
27. A small piece that makes up a larger whole. Each component is there for a specific job - but the sum of components
no movement
Fluid Power
Component
Moment Arm Equation
28. Three- dimensional property measured in units of length times length times length =length x width x height
System
Dimension
Volume
Forces and Vectors
29. 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
Pressure
Rotary
Open System
Component
30. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous
Engineers and scientists need a common language
Gravity
Pythagorean Theorem
System
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)
Applied Brakes
Power Equation
Power
Couple
32. Combustion ignited by spark plug and materials are compressed
Third Stroke (4 Stroke Engine)
If the force is applied away from the center of rotation
Third Stroke (rotary)
Velocity
33. Often a free body has _______ acting on it
Pressure Equation
Base Dimensions
Gravity
more than one force
34. When two parallel forces equal in magnitude and opposite direction - i.e. steering wheel - turn a know - turn on and off a faucet
2 Stroke Engine
Couple
Mechanics describe how forces affect a body
System
35. What we are not studying
Surroundings
Pressure
US Customary
Work
36. ...
Force lets us do work on a system
Static
Hydraulic Cylinders
Second Stroke (Diesel Engine)
37. 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
Work
Second Stroke (2 Stroke Engine)
Common Brake Characteristics
Pascal's Principle
38. Two stroke- Four Stroke- Diesel-Rotary -Hybrid
Mechanics
First Stroke (2 Stroke Engine)
Internal Combustion Engine Types
Fluid
39. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid
40. Used to measure or quantify -US Common: Absolute and Gravitational -SI: absolute
Fourth Stroke (Diesel Engine)
Units
Area
Rotary
41. When the moving fluid is a gas
System
Mechanical Engineering
Equilibrium
Aerodynamics
42. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width
Hybrid Parallel
Area
Force lets us do work on a system
US Customary
43. Force/Area
Moment Arm
Pressure Equation
decrease
Velocity
44. 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
Applied Brakes
Mass
Base Dimensions
Vectors
45. A^2+b^2=c^2 - used to calculate vectors
Pythagorean Theorem
Pythagorean Theorem Equation
Hybrid
Velocity
46. 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
Power Equation
Couple
4 Stroke Engine
Effort
47. A fluid power system uses hydraulics and a fluid under pressure to create a greater force than is applied
Hybrid Series
Fluid Power
Forces
Surroundings
48. Combustion of fuel mixture ignited by spark plug
Second Stroke (2 Stroke Engine)
Effort
Power
Hybrid Parallel
49. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag
Pressure
Conversions
Translation
Equation for Mechanical Advantage regarding inclined planes
50. When the work done by the effort just equals the work done by the load - ______ of the machine will occur
Law of Conservation of Mass
Translation
no movement
Work