POE Midterm Exam

Last updated 20 days ago

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Library

POE Midterm Exam

Last updated 20 days ago

60 questions

Required

2

Required

2

Required

2

Match definitions with the appropriate answers.

Draggable item		Corresponding Item
An external force applied to an object.		Lever
Ratio of distance traveled by the applied effort and resistance force within a system.		Actual Mechanical Advantage
The ratio of the magnitude of the resistance and effort forces applied to a system.

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2

What is a Moment?

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2

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2

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1

Identify a non-renewable energy source.

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2

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1

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1

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1

When components are wired in a parallel circuit, what happens to the total resistance?

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1

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1

What is the R-value of a material?

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1

What is Convection?

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1

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2

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2

If the radius of the circle is 2 inches, what is the y-coordinate of the centroid of this half circle?

Required

3

Match definitions with the appropriate answers.

Draggable item		Corresponding Item

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2

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2

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2

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1

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2

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2

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2

The moment of inertia for a 12 foot long by 3 inch wide and 4 inch high oak board would be

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A wheel driven wheel and axle system will have a mechanical advantage...

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2

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1

If mechanical advantage is greater than 1, proportionally _____ effort force is required to overcome the resistance force.

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1

If you are using a simple gear train to increase the speed of a vehicle, which gear should be attached to the wheel axle?

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2

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1

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2

Find RAy and RBy if A is the pivot point.

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2

What is the reaction force at the end of the roller connection? The given force is in pounds and each grid line is equal to 1 foot.

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2

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2

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2

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1

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1

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2

Calculate the energy transferred over a period of 90 minutes through a wall measuring 4 m by 2 m and 0.15 m thick with a thermal conductivity of 0.25 J/(smC). The opposing sides of the wall measure 25 deg C and 12 deg C.

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2

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2

A motor running a winch system can lift a 3N load 6 meters in 60 seconds while running at an average of 9 volts and drawing 500 mA. What is the efficiency of the system?

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2

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2

If you lift a weight 10 inches using a pulley system with 8 supporting strands, what length of rope (in inches) would you have to pull?

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2

Find the reaction force in the y direction at A.

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2

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2

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2

Calculate the total gear ratio of the gear train if gear A is the driver.

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2

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2

A simple gear train is composed of three gears. Gear A is the driver and has 8 teeth, gear B has 24 teeth, and gear C has 16 teeth. If the output is C, what is the gear ratio?

A first class lever in static equilibrium has a 500 lb resistance force and 15 lb effort force. The lever's effort force is located 4 ft from the fulcrum. What is the actual mechanical advantage of the system?

Match definitions with the appropriate answers.

Draggable item		Corresponding Item
An external force applied to an object.		Lever
Ratio of distance traveled by the applied effort and resistance force within a system.		Actual Mechanical Advantage
The ratio of the magnitude of the resistance and effort forces applied to a system.		Ideal Mechanical Advantage
A rigid bar used to exert pressure or sustain weight at one point of its length by the application of a force at a second and turning at a third on a fulcrum		Effort Force

What is a Moment?

What is the Actual Mechanical Advantage (AMA) of the inclined plane?

Calculate the current at R2.

Identify a non-renewable energy source.

If a student lifts a 225.4N ball 1.202 m in 20 sec, how many joules of work did the student complete?

What is Biomass?

What is Geothermal Energy?

When components are wired in a parallel circuit, what happens to the total resistance?

The U-value of a material measures the ability of the material to ___ heat. The the value the better the material will conduct heat.

Which of the following are digital input devices? Mark all that apply.

What is the R-value of a material?

What is Convection?

What is Energy?

Calculate the total resistance of the circuit.

If the radius of the circle is 2 inches, what is the y-coordinate of the centroid of this half circle?

Match definitions with the appropriate answers.

Draggable item		Corresponding Item
The geometric center of an object.		Centroid
A measure of the tendency of a force to rotate around a point.		Free Body Diagram
When an object is at rest or is moving at a constant velocity.		Moment
An indicator of the stiffness of a material related to its size and orientation. The higher the value, the harder it is to make an object bend.		Static Equilibrium
A diagram that shows all of the forces acting on an object.		Modulus of Elasticity
An indicator of the stiffness of a material related to its material properties. The higher the value, the harder it is to make an object bend.		Moment of Inertia

A machinist is using a 6 inch long wrench to tighten a 1/4 inch bolt. What is the moment (in foot-pounds) if he applies 175 pounds of force to the wrench?

If a 250 pound man walks on a 3" x 6" board (3" is the height) that is 5 feet long and deflects the board 0.25 inches, what is the modulus of elasticity?

If a vector is 30 degrees from the horizon and the force of the vector is 150 pounds, what is the x-component of the vector?

If you wanted to make the moment of inertia higher, the best way to do this would be to

If you were standing in the middle of a 2" x 4" beam (the height is 4") across a 20 foot wide ditch, how much would the beam bend? Assume that you weigh 150 pounds and that the modulus of elasticity of the beam is 1.76 x 106 psi.

In the free body diagram, what is missing?

The moment of inertia for a 12 foot long by 3 inch wide and 4 inch high oak board would be

Two people are pulling on a boat trying to pull it out of the water. Each person has a rope attached to the front end of the boat. One person is pulling with 150 pounds of force straight out of the water (following the x-axis). The other person is pulling the boat with 200 pounds of force at a 45 degree difference than that of the first person. What is the resultant force applied to the boat?

To find the x-value and the y-value for the centroid of a right triangle, you do the following from the corner containing the right angle.

In a free body diagram, how many reaction forces would replace the roller joint (C)?

A wheel driven wheel and axle system will have a mechanical advantage...

If mechanical advantage is greater than 1, proportionally _____ effort force is required to overcome the resistance force.

If you are using a simple gear train to increase the speed of a vehicle, which gear should be attached to the wheel axle?

Find RAy and RBy if A is the pivot point.

What is the reaction force at the end of the roller connection? The given force is in pounds and each grid line is equal to 1 foot.

Calculate the energy transferred over a period of 90 minutes through a wall measuring 4 m by 2 m and 0.15 m thick with a thermal conductivity of 0.25 J/(smC). The opposing sides of the wall measure 25 deg C and 12 deg C.

A motor running a winch system can lift a 3N load 6 meters in 60 seconds while running at an average of 9 volts and drawing 500 mA. What is the efficiency of the system?

If you lift a weight 10 inches using a pulley system with 8 supporting strands, what length of rope (in inches) would you have to pull?

Find the reaction force in the y direction at A.

Calculate the total gear ratio of the gear train if gear A is the driver.

A simple gear train is composed of three gears. Gear A is the driver and has 8 teeth, gear B has 24 teeth, and gear C has 16 teeth.  If the output is C, what is the gear ratio?

4:1

1:4

2:1

6:1

1:3

3:1

1:2

1:6

A first class lever in static equilibrium has a 500 lb resistance force and 15 lb effort force. The lever's effort force is located 4 ft from the fulcrum. What is the actual mechanical advantage of the system?

30,000

0.12

133.33

16.33

66.66

1875

33.33

500

Ideal Mechanical Advantage

A rigid bar used to exert pressure or sustain weight at one point of its length by the application of a force at a second and turning at a third on a fulcrum

Effort Force

The turning effect of a force about a point equal to the magnitude of the force times the perpendicular distance form the point to the line of action from the force.

The amount of effort is takes to turn a force when the effort is applied parallel to the resistance and directly in the line of action neglecting the effect of friction.

A toothed wheel whose teeth engage the links of a chain.

What is the Actual Mechanical Advantage (AMA) of the inclined plane?

0.27

12.5

5

2.5

3.75

1

0.4

Calculate the current at R2.

17.4 mA

6.3 mA

7.2 mA

3.6 mA

36 mA

If a student lifts a 225.4N ball 1.202 m in 20 sec, how many joules of work did the student complete?

271 J

188 J

3750 J

14 J

330 J

5418 J

11 J

What is Biomass?

A natural fuel such as coal of gas, formed in the geological past from the remains of living organisms.

The use of heat form within the Earth or from the atmosphere near oceans.

Energy produced by animal power such as sled dogs or a horse drawn plow.

The production of electricity in conductors with the use of magnets.

A dynamo or similar machine for converting mechanical energy into electricity.

A resource that cannot be replaced once used.

Plant materials and animal waste used especially as a source of fuel.

What is Geothermal Energy?

Energy produced by animal power such as sled dogs or a horse drawn plow.

Plant materials and animal waste used especially as a source of fuel.

The use of heat form within the Earth or from the atmosphere near oceans.

A resource that cannot be replaced once used.

The production of electricity in conductors with the use of magnets.

A natural fuel such as coal of gas, formed in the geological past from the remains of living organisms.

A dynamo or similar machine for converting mechanical energy into electricity.

The U-value of a material measures the ability of the material to _________ heat. The ______ the value the better the material will conduct heat.

Absorb, Higher

Conduct, Lower

Absorb, Lower

Conduct, Higher

Resist, Higher

Resist, Lower

Create, Lower

Create, Higher

Which of the following are digital input devices? Mark all that apply.

Bump switch

LED

Light Sensor

Servo

Potentiometer

Limit Switch

Motor

The measure of a materials ability to conduct heat.

Refers to the property of a thermodynamic system in which all parts of the system have attained a uniform temperature which is the same as that of the system's surroundings.

A property of an object which determines the direction of heat flow when the object is placed in thermal contact with another object.

Refers to the property of a thermodynamic system in which all parts of the system have attained a uniform temperature which is the same as that of the system's surroundings.

The measure of resistance to heat flow..

A type of system that uses circulating pumps and fans to collect and distribute heat.

Stages a product goes through from concept and used to eventually withdraw from the marketplace.

A property of an object which determines the direction of heat flow when the object is placed in thermal contact with another object.

Process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will sink.

What is Energy?

Individual fuel cells that are combined in parallel.

Individual fuel cells that are combined in series.

The flow of electrical power or charge.

Stages a product goes through from concept and used to eventually withdraw from the marketplace.

A property of an object which determines the direction of heat flow when the object is placed in thermal contact with another object.

Process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will sink.

The ability to do work.

Calculate the total resistance of the circuit.

5970 ohms

1.31 ohms

475.5 ohms

103.1 ohms

531 ohms

346.6 ohms

1020 ohms

1 in

8.378 in

0.750 in

1.333 in

0.667 in

0.849 in

The geometric center of an object.

Centroid

A measure of the tendency of a force to rotate around a point.

Free Body Diagram

When an object is at rest or is moving at a constant velocity.

Moment

An indicator of the stiffness of a material related to its size and orientation. The higher the value, the harder it is to make an object bend.

Static Equilibrium

A diagram that shows all of the forces acting on an object.

Modulus of Elasticity

An indicator of the stiffness of a material related to its material properties. The higher the value, the harder it is to make an object bend.

Moment of Inertia

A machinist is using a 6 inch long wrench to tighten a 1/4 inch bolt. What is the moment (in foot-pounds) if he applies 175 pounds of force to the wrench?

43.75 ft-lb

262.5 ft-lb

-87.5 ft-lb

-262.5 ft-lb

153 ft-lb

-43.75 ft-lb

87.5 ft-lb

-153 ft-lb

If a 250 pound man walks on a 3" x 6" board (3" is the height) that is 5 feet long and deflects the board 0.25 inches, what is the modulus of elasticity?

24,412 psi

451,675 psi

193 psi

48 psi

67,500 psi

333,333 psi

83,333 psi

93 psi

If a vector is 30 degrees from the horizon and the force of the vector is 150 pounds, what is the x-component of the vector?

23.1 pounds

300 pounds

75.0 pounds

150 pounds

129.9 pounds

If you wanted to make the moment of inertia higher, the best way to do this would be to

increase the width of the object

increase the length of the object

reduce the density

increase the height of the object

make the object heavier

increase the applied force

decrease the distance the effort is applied from

shorten the object

change the material

If you were standing in the middle of a 2" x 4" beam (the height is 4") across a 20 foot wide ditch, how much would the beam bend? Assume that you weigh 150 pounds and that the modulus of elasticity of the beam is 1.76 x 106 psi.

2.30 in

0.001 in

0.72 in

1.74 in

6.50 in

9.20 in

8.33 in

0.50 in

In the free body diagram, what is missing?

a single horizontal reaction force at B

a single normal force at A

a single vertical reaction force at B

a horizontal reaction force, a vertical reaction force, and a moment at B

a horizontal reaction force and a vertical reaction force at B

16 in4

6 in4

9 in4

432 in4

144 in4

1728 in4

Two people are pulling on a boat trying to pull it out of the water. Each person has a rope attached to the front end of the boat. One person is pulling with 150 pounds of force straight out of the water (following the x-axis). The other person is pulling the boat with 200 pounds of force at a 45 degree difference than that of the first person. What is the resultant force applied to the boat?

206.1 pounds at a 43.3 degree angle  

291.4 pounds at a 64.1 degree angle

323.9 pounds at a 25.9 degree angle

291.4 pounds at a 25.9 degree angle

350 pounds at a 45 degree angle

350 pounds along the x-axis

141.42 pounds along the x-axis

323.9 pounds at a 64.1 degree angle

To find the x-value and the y-value for the centroid of a right triangle, you do the following from the corner containing the right angle.

1/3 of the base and 2/3 of the height

1/3 of the base and 1/3 of the height

1/2 of the base and 1/4 of the height

1/2 of the base and 1/2 of the height

1/2 of the base and 1/3 of the height

2/3 of the base and 1/3 of the height

1/4 of the base and 1/4 of the height

In a free body diagram, how many reaction forces would replace the roller joint (C)?

1

2

3

4

5

Calculate the total energy transfer in Joules for a wall section measuring 3 m x 5 m by 0.03 m thick with a thermal conductivity of 0.10 J/(s*m*C). Opposing sides of the wall section have a temperature of 20 degrees Celsius and 15 degrees Celsius after one hour.

250 J

900,000 J

30,000,000 J

1,200,000 J

15,000 J

180,000 J

300,000 J

A block of aluminum at 90 degrees Celsius is placed in 2.00 liter (2 kg) of water at 15 degrees Celsius. Calculate the energy transferred to the water if the final temperature becomes 37 degrees Celsius. The specific heat capacity of water is 4186 J/(kg*C).

215,703 J

627,900 J

92,092 J

125,580 J

184,184 J

Given the information above, what is the R-value of the wall section at a point through the fiberglass batt? 

31.42

27.56

34.61

19

27.73

15.61

32.47

26.76

A cart is being pushed up an inclined plane. The vertical height of the inclined plane is 7 feet. The effort force required to push the cart up the inclined plane is 6.3 lb. The cart weighs a total of 15 1/3 lbs. What is the IMA? (Precision 0.00)

3.57

2.43

3.43

0.41

0.28

What is the total current in the given in a simple circuit with 3 resistors (413 ohms, 1.3 kilo-ohms, and 0.513 kilo-ohms)? 

594.3 amps

185.5 amps

0.0202 amps

0.0114 amps

0.0054 amps

0.0289 amps

414.813 amps

2226 amps

Which of the following properties is being measured by the multimeter?

resistance

continuity

squiggles

current

voltage

A student travels on a school bus in the middle of winter from home to school. The school bus temperature is 53 degrees Fahrenheit. The student's skin temperature is 92.4 degrees Fahrenheit. Determine the total energy transferred from the student's body during the 20 min ride to school due to electromagnetic radiation. Note: Skin emissivity is 0.90, and the surface area of the student is 1.60 m2. Don't forget to convert those temps to Kelvin!

6368 J

84,400 J

215,400 J

310,700 J

4271 J

115,440 J

221,900 J

3698 J

640,000 J

514,000 J

greater than one

equal to zero

Calculate the ideal mechanical advantage of a given bolt with the thread notes of 5/16 24 NF. The distance from the center of the bolt to the end of the wrench being used to tighten the bolt is 1 foot and 1 inch. 

312

130.7

980.2

1960.4

1.8

1357.1

261.4

7.5

3.4

compound

smallest

What is the x-component of the force vector?

50 lbs

200 lbs

115.5 lbs

30 lbs

100 lbs

What unit is constant in a series circuit?

voltage

resistance

power

valence electrons

ohms

current

energy

RAy = 81.7 and RBy = 45.3

RAy = 24.5 and RBy = 10.5

RAy = 70 and RBy = 105

RAy = 245 and RBy = 210

Calculate the magnitude and direction of the resultant force.

53 N, 44 degrees CCW from positive x-axis

47 N, 35 degrees CCW from positive x-axis

70 N, 73 degrees CCW from positive x-axis

47 N, 55 degrees CCW from positive x-axis

70 N, 27 degrees CCW from positive x-axis

Find the reaction force at B.

1000 lbs

266.67 lbs

250 lbs

133.33 lbs

233.33 lbs

295 lbs

500 lbs

166.67 lbs

What is d2 if the bears are in static equilibrium?

0.15625 ft

4 ft

2.5 ft

250 ft

2 ft

6.4 ft

2.25 ft

What property is being measured by the multimeter?

impedance

current

continuity

ohms

resistance

voltage

R-value

What property can be measured by a multimeter by positioning the leads as shown?

voltage and resistance

resistance only

current only

voltage and current

current and resistance

641,000 J

15,600 J

936,000 J

140,400 J

2632.5 J

842,000 J

In the figure below, the Teenage Mutant Ninja Turtles are balancing on a beam waiting to destroy the Shredded. They are standing balanced in order from left to right: Leonardo (50N), Michelangelo (47 N), Donatello (29 N) and Raphael who didn't weigh in so we don't know his force. Determine Raphael's force in Newtons.

58.6 N

25.4 N

53.67 N

178 N

68 N

6.67%

85%

0.15%

4.7%

30%

16.8%

Calculate the ideal mechanical advantage of the lever shown.

0.45

0.5

2.44

0.41

14.22

2

2.91

8 in

10 in

A student weighs 150 lbs (F) and is standing on a beam which spans 96 inches (L). The Modulus of Elasticity (E) of the beam is 1,200,000 lb/in2 and the moment of inertia (I) is 12 in4. Calculate the beam deflection.

0.196 in

0.0001 in

0.1742 in

0.192 in

0.249 in

3.98 x 1013 in

0.001 in

0.213 in

Calculate the resistance force if the lever is in static equilibrium.

11 lb

37.25 lb

41.25 lb

39.75 lb

5.45 lb

10

5

0.1

4

2.5

20

What is the IMA for the pulley shown?

6

1

2

3

5

The electric winch is powered by an 18V battery. The winch lifts the weight shown a total of 13 meters and draws a total of 20 Amps. the weight is 210 Newtons. It takes a total of 17 seconds. What is the Power Out for the given scenario?

360 watts

260 watts

196 watts

160.6 watts

21.2 watts

222 watts

2730 watts

POE Midterm Exam

POE Midterm Exam

Match definitions with the appropriate answers.

What is a Moment?

Identify a non-renewable energy source.

When components are wired in a parallel circuit, what happens to the total resistance?

What is the R-value of a material?

What is Convection?

If the radius of the circle is 2 inches, what is the y-coordinate of the centroid of this half circle?

Match definitions with the appropriate answers.

The moment of inertia for a 12 foot long by 3 inch wide and 4 inch high oak board would be

A wheel driven wheel and axle system will have a mechanical advantage...

If mechanical advantage is greater than 1, proportionally _____ effort force is required to overcome the resistance force.

If you are using a simple gear train to increase the speed of a vehicle, which gear should be attached to the wheel axle?

Find RAy and RBy if A is the pivot point.

What is the reaction force at the end of the roller connection? The given force is in pounds and each grid line is equal to 1 foot.

Calculate the energy transferred over a period of 90 minutes through a wall measuring 4 m by 2 m and 0.15 m thick with a thermal conductivity of 0.25 J/(s*m*C). The opposing sides of the wall measure 25 deg C and 12 deg C.

A motor running a winch system can lift a 3N load 6 meters in 60 seconds while running at an average of 9 volts and drawing 500 mA. What is the efficiency of the system?

If you lift a weight 10 inches using a pulley system with 8 supporting strands, what length of rope (in inches) would you have to pull?

Find the reaction force in the y direction at A.

Calculate the total gear ratio of the gear train if gear A is the driver.

A simple gear train is composed of three gears. Gear A is the driver and has 8 teeth, gear B has 24 teeth, and gear C has 16 teeth. If the output is C, what is the gear ratio?

A first class lever in static equilibrium has a 500 lb resistance force and 15 lb effort force. The lever's effort force is located 4 ft from the fulcrum. What is the actual mechanical advantage of the system?

Match definitions with the appropriate answers.

What is a Moment?

What is the Actual Mechanical Advantage (AMA) of the inclined plane?

Calculate the current at R2.

Identify a non-renewable energy source.

If a student lifts a 225.4N ball 1.202 m in 20 sec, how many joules of work did the student complete?

What is Biomass?

What is Geothermal Energy?

When components are wired in a parallel circuit, what happens to the total resistance?

The U-value of a material measures the ability of the material to _________ heat. The ______ the value the better the material will conduct heat.

Which of the following are digital input devices? Mark all that apply.

What is the R-value of a material?

What is Convection?

What is Energy?

Calculate the total resistance of the circuit.

If the radius of the circle is 2 inches, what is the y-coordinate of the centroid of this half circle?

Match definitions with the appropriate answers.

A machinist is using a 6 inch long wrench to tighten a 1/4 inch bolt. What is the moment (in foot-pounds) if he applies 175 pounds of force to the wrench?

If a 250 pound man walks on a 3" x 6" board (3" is the height) that is 5 feet long and deflects the board 0.25 inches, what is the modulus of elasticity?

If a vector is 30 degrees from the horizon and the force of the vector is 150 pounds, what is the x-component of the vector?

If you wanted to make the moment of inertia higher, the best way to do this would be to

If you were standing in the middle of a 2" x 4" beam (the height is 4") across a 20 foot wide ditch, how much would the beam bend? Assume that you weigh 150 pounds and that the modulus of elasticity of the beam is 1.76 x 106 psi.

In the free body diagram, what is missing?

The moment of inertia for a 12 foot long by 3 inch wide and 4 inch high oak board would be

To find the x-value and the y-value for the centroid of a right triangle, you do the following from the corner containing the right angle.

In a free body diagram, how many reaction forces would replace the roller joint (C)?

A wheel driven wheel and axle system will have a mechanical advantage...

If mechanical advantage is greater than 1, proportionally _____ effort force is required to overcome the resistance force.

If you are using a simple gear train to increase the speed of a vehicle, which gear should be attached to the wheel axle?

Find RAy and RBy if A is the pivot point.

What is the reaction force at the end of the roller connection? The given force is in pounds and each grid line is equal to 1 foot.

Calculate the energy transferred over a period of 90 minutes through a wall measuring 4 m by 2 m and 0.15 m thick with a thermal conductivity of 0.25 J/(s*m*C). The opposing sides of the wall measure 25 deg C and 12 deg C.

A motor running a winch system can lift a 3N load 6 meters in 60 seconds while running at an average of 9 volts and drawing 500 mA. What is the efficiency of the system?

If you lift a weight 10 inches using a pulley system with 8 supporting strands, what length of rope (in inches) would you have to pull?

Find the reaction force in the y direction at A.

Calculate the total gear ratio of the gear train if gear A is the driver.

Calculate the energy transferred over a period of 90 minutes through a wall measuring 4 m by 2 m and 0.15 m thick with a thermal conductivity of 0.25 J/(smC). The opposing sides of the wall measure 25 deg C and 12 deg C.

The U-value of a material measures the ability of the material to ___ heat. The the value the better the material will conduct heat.

Calculate the energy transferred over a period of 90 minutes through a wall measuring 4 m by 2 m and 0.15 m thick with a thermal conductivity of 0.25 J/(smC). The opposing sides of the wall measure 25 deg C and 12 deg C.