222 terms

# PT Final Exam Review

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Scalar
A quantity that is fully specified by measuring its size is called a:
Stress
Tension, compression, bending and twisting are kinds of mechanical:
Direction
A resultant force has both magnitude and:
Weight
The measure of gravitational pull is:
Newtons or kilogram weight
The SI units of mechanical force are:
45 lb×ft
A 30 lb. force applied to the end of a 1.5 ft wrench produces a torque of:
T=F×L
The formula for torque (T) is:
2 lbs
Dave and Deborah push a cart with a force of 5 lb. and 7 lb. respectively, in the opposite direction. The magnitude of the resultant is:
15 lbs
Bill and Mary push a cart with a force of 6 lb. and 9 lb. respectively, in the same direction. The magnitude of the resultant is:
15 lbs
Kevin and Sandy push a cart with a force of 7 lb and 8 lb. respectively, in the same direction. The magnitude of the resultant is:
30 lb×ft
A 20 lb. force applied to the end of a 1.5 ft. wrench produces a torque of:

T=F x L
Rotational
Torque is a measure of what kind of force?
36 lb×ft
A 20 lb. force applied to the end of a 1.8 ft. wrench produces a torque of:

T=F x L
Pneumatic or hydraulic
All fluid systems can be classified as either:
Fluid
What is a gas or a liquid that conforms to the shape of its container?
Liquid
A hydraulic system uses:
Specific gravity
In fluid systems the quantity that has no units is:
Absolute pressure
Total pressure above zero pressure is:
14.7 lb/in²
Sea level air pressure is:
Water
The basic reference for density is:
Mass divided by volume
Density is equal to:
Density times volume
Mass is equal to:
Specific gravity
A hydrometer measures:
Lb/in²
A unit of pressure is:
Weight density time height
Pressure equals:
N/m²
An SI unit of pressure is:
A battery
The most common source of DC voltage is:
Anode
A term that pertains to DC voltage is:
Source
In a circuit, the battery would be the:
Control element
In a circuit, the switch would be the:
In a circuit, the lamp would be the:
AC
Which of the following does NOT refer or pertain to batteries?
18 volts
Three 6-volt batteries connected in series would produce a voltage of:
15 volts
A 9-volt and a 6-volt battery connected in series would produce:
24 volts
Two 9-volt and one 6-volt batteries connected in series would produce:
3 volts per lamp
A series circuit containing one 6-volt battery and two identical lamps would produce a voltmeter reading of:
6 volts per lamp
A parallel circuit containing one 6-volt battery and two lamps would produce a voltmeter reading of:
Oscilloscope
Voltage difference is measured with a/an:
DC Volts
To measure the strength of a battery, set the multimeter function to:
Warmer regions to cooler regions
Heat energy moves from:
Heat
Temperature depends on the presence or absence of:
Dry ice (-196°C)
The substance with the LEAST energy of molecular motion would be:
Heat
Which of the following is a form of energy?
68 ⁰F
Room temperature would be approximately:
-6.7⁰C
20⁰F is equal to:

T ⁰C = 5/9 (T ⁰F- 32)
212F⁰
100C⁰ equals:
42.2⁰C
108⁰F equals how many degrees Celsius?

T ⁰C=5/9(T ⁰F-32)
226.4⁰F
108⁰C equals how many degrees Fahrenheit?

T⁰F = 9/5(T⁰C)+32
The object remains in place
Which of the following is NOT an effect of mechanical work on an object?
1000 ft×lbs
A vertical force raises a 200 lb. Barbell 5 ft. The amount of work done is:

W=F x d
None
How much work is being done by a person holding a 60 pound suitcase 18 inches above the floor?
Radius of the circle in which the force is applied.
The prime mover in an angular mechanic system is called torque which is determined by multiplying the force applied, by the lever arm. The lever arm is equal to the:
Angle moved through
Work done by a torque is equal to the torque applied times the:
The length of the radius of a circle measured on the circumference is one:
37680 joules
How much work is done while an electric motor drives a pump through 40 revolutions, given the motor delivers 150 N×m of torque?

W=T x ∅
10.4 meters
520 N×m of work is done when a 50 Newton force is moved a distance. How far is the load moved?

W=F x d
2070 in×lb
A wrench with an 18 inch handle turns through an angle of 2.3 radians while a force of 50 lbs. is applied to the end of the handle. How much work is done?

T=F x L

W=T x ∅
240
Two hundred Newtons of force are required to lift a mass 1.2 meters above the floor. How many Newton.meters of work are done?

W=F x d
9.0 × 10⁴ N×m
A loaded cart is pulled a distance of 100 meters by an electric truck that exerts 900 Newtons of force to pull the cart at a constant speed. If the 100 meters is covered in 12 seconds, how much work is done?

W=F x d
900 ft×lbs
A vertical force raises a 150 lb. box 6 ft. The amount of work done is:

W=F x d
129.5
37 Newtons of force are required to lift a mass 3.5 meters above the floor. How many Newton.meters of work is done?

W=F x d
Reused
The hydraulic brake system in most cars can be described as a closed fuel system because the fluid is:
Multiplying .7854 x d²
The cross sectional area of a cylinder can be found by:
Pressure times change in volume
In fluid systems, the work equation may take two forms: work equals pressure difference times fluid volume moved, or work equals:
It is a way to distinguish between torque and work units
In the English system of units, why is torque expressed in lb×ft and work in ft×lb
.045 N×m
A pressure of 200 N/m² is applied to a pneumatic cylinder that has a piston with a 3 cm diameter and a 0.32 m stroke. How much fluid work can be done in one piston stroke?

W=P(∆V)

V=.7854d² (l)
Weight Density
The work required to lift water from a lake to a tank above the lake is given by the formula W=∆P×V. To find the pressure difference (∆P), you must know the height (h) of the lift as well as the:
56.6%
A box weighing 200 pounds is pushed 8 inches on to a conveyor belt by the shaft on a hydraulic cylinder. The cylinder has a 3 inch diameter and a pressure of 50lb/in2 applied to move the piston and shaft. How efficient is the system?

W=F x d

W= ∆pV

V = .7584d²(l)

% Eff = W₀/W₁

A = 7854d²
4 × 10⁵ N×m
A pump lifts 2 cublic meters (m³) of water through a pressure difference of 2 × 10⁵N/m². How much fluid work is done by the pump?

W= ∆PV
4071.5 cm³
An engine has eight cylinders each has a bore (diameter) of 9 centimeters and a stroke of 8 centimeters. What is the engines's displacement in cubic centimeters?

V = .7584d²(l)
500 joules/cylinder
In an engine where each cylinder is ten centimeters in diameter and has a stroke of twelve centimeters, how much work can be done by each cylinder if combustion produces 530.56 x 10³ N/m² of pressure in each cylinder when the spark plug fires?

V = .7854d²(l)

W= ∆pV
62.4 lb/ft³
160 lb/ft² of pressire is required to lift a certain liquid 25 feet from a tank car to a storage tank. What is the weight density of the liquid?

∆p= pwh
15 ft×lb
A hydraulic cylinder rod is moved 1 ft. by pressure of 60 lb/ft². What is the amount of fluid work done if 0.25 ft³ of oil is displaced?

W = p(∆V)
.253 N×m
A pressure of 300 N/m² is applied to a pneumatic cylinder that has a piston with a 5 cm diameter and a 0.43 m stroke. How much fluid work can be done in one piston stroke?

W=P(∆V)

V = .7854d² (l)
6.25 × 10¹⁸ electrons
The coulomb is a unit of electrical charge that is made up of:
Amount of charge moved/second
Current is defined as:
Voltage
The force like quantity in the equation for electrical work is:
Amperes
The rate of movement of electrical charge is measured in:
5000 joules
5,760 joules of electric work is done on an electric motor that is connected to an overhead crane that lifts steel "I" beams. each beam weighs 2,000 Newtons and is lifted a height of 2.5 meters, how much work is done by the motor while lifting on the beam? W=F x d
80%
An electric motor does 800 Nm of useful work while it uses 1000 joules of electrical energy. The efficiency of the motor is:

%Eff.= W₀/W₁ x 100
15 coulombs
A 12-volt battery does 180 volt coulombs of work. How much charge has been moved?

W=Vq
Joule
One coulomb of charge times one bolt is equal to one:
50 coulombs
A battery-powered windshield wiper motor is activated for 10 seconds and draws a current of 5 amps at a voltage of 12 volt. The total amount of charge moved is:

I = q/t
6 volts
Forty eight thousand joules of work is done in an electrical circuit when 8,000 coulombs of electrical charge is moved. What voltage difference causes the charge to move?

W = Vq
750000 joules
An electric motor that is connected to an overhead crane lifts stacks of reinforcement rods. Each stack of rods weighs 3,000 Newtons. How much work is done by the motor if it lifts 5 stacks of rods 50 meters?

E=F x d
80%
An electric motor does 317 Nm of useful work while it use 400 joules of electrical energy. The efficiency of the motor is approximately:

%Eff.= W₀/W₁ x 100
8.18 volts
27 thousand joules of work is done in an electrical circuit when 3,300 coulombs of electrical charge is moved. When voltage difference causes the charge to move?

W= Vq
Decelerating
A negative sign in front of an acceleration would indicate the object is:
Measuring acceleration
In the English system of units, ft/sec² indicates a unit for:
Buckshot fired from a gun
Which of the following is associated with linear rate?
The shaft of an electric drill
Which of the following is associated with a rotational rate?
Direction and time
Angular rate is expressed in which terms?
Meters per second
When using the international system of units (SI), the mechanical rate is measured in:
A jet airplane accelerating down a runway
Which of the following has a linear rate?
9.8 meters per second squared
In the SI system, the acceleration of gravity is:
Number of items produced per unit of time.
Production rate is the:
A deceleration
Negative acceleration is also referred to as:
Revolutions per minute
The term RPM refers to:
Rate = Displacement-like Quantity / Elapsed Time
The general unifying equation for expressing rate is:
V = I/t
A letter definition, or equation, for linear speed is:
Appear to stand still
A wheel is turning at a rate of 240 RPM. A strobe light is set at 240 FPM. Which one best describes what will happen? The wheel will:
2 feet per second
A box placed on a conveyor belt, moving at a constant speed, travels 240ft in 2 minutes. What is the speed of the box and the conveyor in feet per second?

V = I/t
50 miles per hour
A bus changes speed frequently. The total distance it travels is 850 miles. The total driving time is 17 hours. What is the average speed of the bus?

V = I/t
A brake is applied to a flywheel for 5 seconds, reducing the angular velocity of the flywheel from 2.2 rads/second to 1.8 rads/second. What is the angular acceleration of the flywheel?

a = (Vf - Vi)/t
Magnitude and direction
A vector must have:
Mass-flow
Fluid-flow rate units such as "kg per min" or "gm per sec" are units of:
Volume
A unit of measure, such as "gal" or "liter" is a unit of:
A "volume or Mass"-flow rate
A rate associated with a fluid system:
The flow rate is inversely proportional to the distance traveled
When gasses are compressed, storage tanks should be located as close to the point of use as possible because:
833
A supertanker loaded with 1.5 million gallons of crude oil is to unload at an offshore discharge buoy. The ship pump can discharge the oil in 30 hours. What is the volume flow rate of crude oil in gallons per minute?

Qv = V/t
2.5 gallons per hour
IF a leak in a faucet causes a water loss of 120 gallons in two days, what is the volume flow rate per hour? Qv = V/t
3 gal/hour
If a leak in a water line causes the loss of 144 gallons in 2 days, what is the volume-flow rate of the leak?

Qv = V/t
920 gallons
A bath tub faucet drips 200 gallons in ten days. How many gallons will have been lost in 46 days? Qv = V/t
5 cubic inches/sec
A weir gage, with a cross-sectional area of 10 square inches at a height of 3 inches at the weir is being used to measure liquid flow. If the float takes 20 seconds to move 10 inches. what is the volume flow rate in the weir?

V = Al
Qv = V/t
2 gallons per second
If a factory produces 120 gallons of hydrogen peroxide per minute, how many gallons of hydrogen peroxide are produced per second Qv = V/t
380,952
A supertanker loaded with 2 million gallons of crude oil run aground and begins to leak oil. The leak causes the ship to lose 15,873 gallons per hour. How many gallons of oil will be spilled during a 24 hour period? Qv = V/t
2160
A toilet leaks 1 gallon of water every 20 minutes. Approximately how many gallons will be lost in a month? Qv = V/t
One coulomb per second
One ampere equals:
.001 amperes
One milliampere of electric current equals:
1 × 10⁻⁶ amperes
One microampere equals:
½ ampere
500 milliamperes equals:
D.C. voltage
A DMM is often used to measure:
60 coulombs
Find the charge that flows through an electric iron in 10 seconds if the iron is rated at 6 amperes. I = q/t
6.25 × 10¹⁸
A generator produces a current of one ampere. How many electrons are induced in the coils in one second?
4950 hertz
A function generator changes frequency from 50 to 5000 Hz. What is ∆f?
Voltage waveform
An oscilloscope can be used to measure the period of a:
Oscilloscope
The frequency of a voltage can be measured with an:
Voltage increments
The vertical volts per division control of an oscilloscope is used to adjust the:
420 coulombs
Find the charge that flows through an electric toaster in 1 minute if the toaster is rated at 7 amperes.

I = q/t
One calorie
The amount of heat required to raise one gram of water one Celsius degree is:
Heat energy
A calorie is a unit of:
Latent heat
When a substance (such as water) goes from a solid to a liquid state without a change in temperature, the heat added during the transformation is called:
One calorie per gram Celsius degree
The specific heat of water is:
Temperature
A Cromel and Constantan Thermocouple used to measure:
Celsius degrees
In the SI system, temperature difference is expressed in:
Constantan and chromel
Type 'E' thermocouples are made from:
4000 Btus per hour
A toaster element produces 2000 Btus of heat energy in 30 minutes. What is the heat-flow rate?
A device used to contain and store heat energy is called a:
QH
Heat-flow rate is represented by:
300000 Btus
A heater is rated a 25,000 Btu/hr. What is the heat energy generated in 12 hours in a 144 square foot room?

QH = H/t
10 Btus/Fahrenheit degree
The heat capacity of 10 pounds of water is :
Zero degrees Celsius
When using type "E" thermocouples in laboratory experiments, what reference temperature is used to construct the temperature chart?
Drag force
For an object moving through a fluid, streamlining is a way to reduce:
Kinetic friction
Rolling friction is a type of:
Teardrop
Which of the following shapes is most streamlined?
15 lb.
A wooden crate that weighs 50 lb. is pilled across a wooden floor at a constant speed. The coefficient of friction for wood on wood is 0.3. What is the frictional force necessary to keep the crate moving?

F = µN
0.4
It takes a fore of 20 lb. to move a 50 lb. wooded crate across a stone floor. What is the coefficient of friction for wood on stone? F = mN
Newton
What is the SI unit that represents force?
2800 lb.
The weight of a truck is 4000 lb. and is parked on a wet concrete loading ramp. Another truck bumps into it and slides it our of position. What force was necessary to overcome friction? Static friction of rubber on wet concrete is 0.7.

F = µN
66.67 N
A plastic box weighing 100 N will start to slide on a metal truck bed when a push of 50 lb. is applied. What is the coefficient of static friction for plastic on metal? F = µN
Kinetic friction
Static friction is greater than:
66.67 N
It takes 20 Newtons of force to move a wood desk across a wood floor. The coefficient of kinetic friction for wood on wood is 0.3. How much does the desk weigh.

F = µN
16.67 N/(m/sec)
A drag force of 200 N is experienced by a boat moving through water at a speed of 12 m/sec. What is the drag resistance.

RD = F / V
0.12 N/(m/sec)
What is the drag resistance of a rocket with a drag force measured at 6 Newton when traveling at 50 m/sec?

RD = F / V
Lb/(ft/sec)
The English unit for drag resistance is:
Lengthen the pipe
A way to increase resistance in a pipe is to:
Heat the fluid
A way to decrease resistance in a pipe is to:
lb/in²
Fluid pressure in English units is usually measured in:
Motor oil
Which of the following has the greatest viscosity?
0.2 gal/min
What is the fluid flow rate when the pressure drop (∆p) is 5 lb/in² and the fluid resistance (Rf) is 25 lb/in² / gal/min

RF = P/Qv
∆p = Rf x Qv
Given: Rf = ∆p / Qv

Find: ∆p
Qv = ∆p / Rf
Given: Rf = ∆p/Qv

Find: Qv
0.36 (lb/in²) / (gal/min)
Water flowing through a pipe at 550 gal/min has a pressure difference of 200 lb/in². What is the fluid resistance?

Rf = P/Qv
Multimeter
Which of the following instruments does not measure fluid pressure?
1100 lb/in²
The resistance (Rf) in a fuel-transfer pipeline is 2 (lb/in²)/(gal/min). Fuel moves through the pipe at a volume flow rate of 550 gal/min. What is the pressure difference along the length of the pipeline?

Rf = P/Qv
0.2 gal/min
What is the approximate fluid flow rate when the pressure drop (∆p) is 7 lb/in² and the fluid resistance (Rf) is 33 lb/in² / gal/min?

Rf = P/Qv
0.53 (lb/in²) / (gal/min)
Water flowing through a pipe at 330 gal/min has a pressure difference of 175 lb/in². What is the fluid resistance?

Rf = P/Qv
Atoms
Electrical resistance occurs because electrons moving through a wire bump into:
Tolerance band
The fourth band of a 4 band resister is the:
To find the total resistance in a series circuit the individual resistances must be:
Conductors
Copper wire and solder are each classified as:
6 volts
A current of 0.25 amperes flows through a 24 ohm resister. The voltage drop across the resistor is: V=I x R
6 ohms
∆ Vtot = 60 V.
R₁ = 3 Ω.
R₂ = 3 Ω

Rtot = :
10 amps
∆ Vtot = 60 V.
R₁ = 3 Ω.
R₂ = 3 Ω

Itot = :
10 amps
∆ Vtot = 60 V.
R₁ = 3 Ω.
R₂ = 3 Ω

I₁ = :
30 volts
∆ Vtot = 60 V.
R₁ = 3 Ω.
R₂ = 3 Ω

∆V₁ = :
10 amps
∆ Vtot = 60 V.
R₁ = 3 Ω.
R₂ = 3 Ω

I₂ = :
30 volts
∆ Vtot = 60 V.
R₁ = 3 Ω.
R₂ = 3 Ω

DV2 = :
3.0
A current of 0.03 amperes flows through a 100 ohm resistor. The voltage drop across the resistor is: V=I x R
384.6 ft³
3.6 x 10⁶ ft lb of work is required to mobe a volume of water from a lake to a tank 150 ft above the lake. How much water is pumped while doing this much work?

pw = 62.4lbs/ft³ (for water)
∆p = pw x h
W = ∆pV
Cal/sec
Thermal flow rate in SI is usually measured in:
F°/Btu/hr
Thermal resistance in English units may be expressed as:
Thermal conductivity
Which of the following indicates how well material conducts heat energy?
Rt=∆T/Qh
A defining equation for thermal resistance is:
0.25 F°/Btu/hr
The temperature difference (∆T) between the inside and outside of an electric oven is 300 F°. The heating element must supply 1200 Btu/hr of heat energy to the oven to overcome the heat-flow rate out of the oven. Find the thermal resistance of the oven walls. Rt = ∆T / Qh
I=Rt(kA)
Rearrange the formula, RT = l / kA, to solve for l.
20 kcal/hr
A firefighter's suit has a thermal resistance of 50 C°/kcal/hr. When exposed to a fire the temperature difference from outside to inside the suit may be 1000 C°. What is the heat-flow rate through the suit at 1000 C°?
RT = ∆T / Qh
307.69 kcal/hr
A house has a thermal resistance of 0.13 C°/kcal/hr. What is the buidings heat-flow rate when the temperature difference fro minside to outside is 40C°? RT = ∆T / Qh
109.37 C°/kcal/hr
The temperatire inside a house is 24°. The temperature outside is 4° A furnace supplies 2625 Kilocalories to the house every hour to maintain a constant temperature of 24°. What is the overall thermal resistance of the house?
Rt = ∆T / Qh
400 Btu/hr
A hot water heater runs at 140°F in a room with a temperature of 80°F. The insulation of the heater has a termal resistance of 0.15 F°/Btu/hr. What is the heat flow rate?
RT = ∆T/Qh
.23 F°/Btu/hr
The temperature difference (∆T) between the inside and outside of an electric oven is 350 F°. The heating element must supply 1500 Btu/hr of heat energy to the oven to overcome the heat-flow rate out of the oven. Find the thermal resistance of the oven walls. RT = ∆T/Qh
200 kcal/hr
A house has a thermal resistance of 0.15 C°/kcal/hr. What is the building's heat-flow rate when the temperature difference from inside to outside is 30C°? Rt = ∆T/Qh
Gravitational potential energy
What aspect of an ovject increases as its height increases?
Speed
Kinetic energy invloves the mass of an object and its:
Kinetic
An avalanche in progress is an example of what type of energy?
20000000 ft×lbs
What's the potential energy of a cloud at 10,000 feet if the condensed moisture in the cloud has a total weight of 2,000 pounds? Ep = wh
4 pounds per inch
A spring i compressed 4 inches by a force of 16 pounds. What's the spring constant (k) for this spring? K = F/d
Displacement
In the equation Ep = ½ kd², what does d represent?
2940000 N×m
The density of water is 1000 kg/m³. The mass of a volume of water is equal to the density of the water times its volume. How much potential energy is stored in 75 m³ of water that is raised to a height of 4 meters?
Ep = wh

W = m × g
5000 ft×lb
What is the gravitational potential energy stored in a box that weighs 1000 lbs. and located 5 ft above the floor? Ep = wh
112500 ft×lb
Water is stored in a storage tank of a factory fire-sprinkler system. The tank is located 75 feet above the factory floor. How much potential energy is released when 1500 lb. of water is released into the system. Ep = wh
343200 ft×lb
A water pump is rated at 4 hp and pumps 5.5 cubic feet of water per minute. The pump lifts the water 100 feet into a tank. How much potential energy is added to the water after 10 minutes of pumping?
Ep = wh
2500000000 ft×lb
5000000 lbs of water are stored behind a dam that is 500 feet above a town. How much potential energy would be released if the dam collapsed? Ep = wh
2.4 pounds per inch
A spring is compressed 5 inches by a force of 12 pounds. What's the spring constant (k) for this spring? K = F/d
Angular speed
In the formula, Ek = ½Iw², the w represents the:
Linear kinetic energy
Objects moving in a straight line contain:
Moment of intertia
When an automobile tire is unbalanced, what needs to be adjusted?
Rotational kinetic energy
Objects moving in a curved path contain:
2141 N×m
How much kinetic energy can be stored in a flywheel that has a radius of 0.25 meters, a mass of 50 kg, and is rotating at 500 rpm?

I = ½ mr²

Ek = ½w²
25 kg×m²
Calculate the moment of intertia for a disk type flywheel. The flywheel has a mass of 200 kg and a radius of 0.5 meters.

I = ½ mr²
34256.5 J
A flywheel has a moment of inertia of 25 kg×m² and is rotating at 500 rpm (52.35 rad/sec). How much rotational kinetic energy is stored in the flywheel?

Ek = ½ Iw²
1000000 J
A box of cargo was pushed out of an open airplane and its parachute failed to open. The box weighed 1,000 N and the air plane was at an altitude of 1,000 meters when the cargo box was pushed out of the plane. How much kinetic energy did the box have at the instant it hit the ground?
Ep = wh
480000 J
Steam under high pressure flows through a nozzle and is forced through a turbine. The steam has a density of 60 kg/m³ and flows with a speed of 20 m/sec. In one second, 40 m³ of steam strike the turbine blades. How much kinetic energy does the steam have?
Ek = ½ mv²

m = pV
878.9 ft×lb
Water under high pressure strikes the blades of a turbine in a dam. During each second, 1,000 lb. of water moving at 7.5 ft/sec strike the turbine blades. How much kinetic energy does the water have?
Coils of wire wrapped around a conducting core
An inductor consists of:
Color code of the wire in the coil
Inductance for a given coil DOES NOT depend on the:
Age of the plates
The capacitance of a capacitor DOES NOT depend on the:
Filter circuits
Capacitors and inductors are used in circuits called:
Ep = ½ LI²
What is the correct equation for calculating the potential energy stored in an inductor?
Ep = ½ C(V)²
Which of the following equations is the correct equation for calculating the potential energy stored in a capacitor?
0.0625 J
Find the energy stored in a capacitor rated at 50 µF (50 × 10⁻⁶ F) where the voltage difference across the plates is 50 volts.
Ep = ½ C(V²)
45 J
An inductor has an inductance of 25 henries and it draws 20 amps of current. How much energy is stored in the inductor?

Ep = ½ LI²