ASTB Mechanical Comprehension Test

229 cards

IE or Firefox are the preferred browsers.  For each question, select the option that is most nearly correct. If you answer the questions in order:the ASTB Study Supplement Book Math Skills start from #208-228, consisting of questions formed from the lectures and the practice test section of the packet.the Peterson's Master the Officer Candidate Tests ebook questions start from #175-207, with a mix of simple...


 
  
Created Apr 14, 2010
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  Side A   Side B
1

The wheels are connected by a belt. As the wheel on the left makes one revolution, the wheel...

 
more than one revolution
2

If the wheel on the left turns clockwise, in which direction does the wheel on the right...

 
Counterclockwise
3

A woman sits in a dragster at the beginning of a race. As the light turns green, she steps...

 
More than while stationary
4

All the gears in the system are moving and Gear 1 rotates clockwise. What other gears in...

 
3 and 5
5

In which case is less force needed to move weight (W) up the ramp?


A

B

The...

 
A
6

If each pendulum is released from the position shown, which pendulum requires the longest...

 
B
7

The voltage drop or potential difference is greater across which resistor?


Ra

Rb

It...

 
It is the same across either resistor
8

If the large portion has 3 times the surface area of the small piston, how far must the...

 
3 inches
9

If you had to swim across a fast moving stream exactly perpendicular to the banks, when...

 

Directly across from where you started


According to the answer sheet given,...

10

If the three squad leaders are to stay on line, which of them must turn the most slowly?


A

B

C

 
C
11

In order to balance the scale above, the fulcrum should be moved


toward...

 
toward B
12

If the scale was balanced before u moved the fulcrum, which of the balls is more dense?


Ball...

 
Ball B
13

Where would it be best to hold a pruners' handles while trying to cut a branch?


A

B

It...

 
B
14

If the current leaves the battery in the direction shown in the diagram, what is the direction...

 
A
15

The voltage drop is greater across which resistor


Rx

Ry

It...

 
Rx
16

Where is the current greater in the circuit?


Greater at A than B

Greater...

 
The same at A and B
17

X, which has a negative charge, is positioned between a positive charge (A) and a negative...

 
A
18

In a stream, water flows through narrow and wide sections. In which sections does the water...

 
Narrow section
19

At what point is the velocity of a bullet fastest?


When it leaves the muzzle

When...

 
When it leaves the muzzle
20

The rate of heat exchange is faster between


an ice cube and 100° glass...

 
an ice cube and 100° glass of water
21

If two glasses of water 40° and glass A was 1/2 full whle glass B was 3/4 full, which glass...

 
B
22

Did you read a mechanical comprehension hand out?


No, but I will now.

No!...

 
Yes, and I understood everything.
23

If the large pistion has 2 times the surface area of the small piston, how far must the...

 
1/2 inch
24

When the wheels X are turned at the same speed, which turns wheels Y faster?


Wheel...

 
Wheel X1
25

Imagine if wheels X where the front  sprocket of a bicycle and wheels Y the rear sprocket....

 
System A
26

If wheel X1 is exactly twice the size wheel Y1, and wheel X1 is turned one time, how many...

 
Two turns
27

In system A, as wheel X1 makes one revolution, point A


travels a greater...

 
travels the same distance as point B
28

Above is a cross section of a wing. Air travels over it and under it. As the wing moves...

 
greater above the wing
29

When the plug in the tube is removed, water flows


into the tube

out...

 
into the tube
30

For which position of the weight is the tension on the string at point X greater?


A

B

It...

 
B
31

When is it more difficult to hold an inflated beach ball under water?


Close...

 
Down deep
32

When does a beach ball seem more buoyant?


Close to the surface

Down...

 
Down deep
33

Which weight exerts less pull on the horizontal bar from which the weights hang by strings?


A

B

Each...

 
A
34

A submarine is traveling through the ocean when its outer hull cracks and air pushes out...

 
A
35

A submarine is traveling through the ocean when its outer hulls cracks and air pushes out...

 
towards the starboard
36

If the board to the left was placed in water, in what orientation would it float?


A...

 
B higher than A
37

If two resistors and a battery are arranged in each of the above circuits, which circuit...

 
Circuit A
38

The lever above is anchored just to the left of point A. If one were to raise it one inch...

 
more than one inch
39

In which case is more force needed to raise the weight?


A

B

The...

 
A
40

Which system requires more rope to be pulled to lift the weight the same distance?


A

B

They...

 
B
41

Which pendulum takes less time to make one swing?


A

B

Each...

 
A
42

If pendulum A was the same length as pendulum B, which pendulum would take more time to...

 
Each would take the same time to make one swing
43

Newton's First Law

An object in motion will stay in motion, object at rest will stay


in...

 
at rest
44

Newton's Second Law

Force = Mass * 


Gravity

Acceleration

Velocity

Speed

 
Acceleration
45

Newton's Third Law

For every action there is


a) an equal...

 
a) an equal and opposite reaction
46

Speed of conduction, which occurs in solids and stationary liquids


a)...

 
c) depends on the temperature difference
47

Butcher Knives, Axes, Nail Cutters, are examples of


Levers

Pulleys

Wedges

Screws

 
Wedges
48

This device is typically used to measure wires, spheres, shafts and blocks.


Micrometer

Multimeter

Tape...

 
Micrometer
49

Compressing air in a closed place will _______ the volume and ______ the pressure


decrease,...

 
decrease, increase
50

Bernoulli's principal


applies to liquids

applies to air

involves...

 

all of the above

51

This class of lever is like your everyday crowbar. The fulcrum is in the middle with the...

 
First class lever
52

On this class lever, the fulcrum is on the end, the resistance force, the load, is in...

 
Second class lever
53

On this class lever, the fulcrum is on the end of one side, the effort force is in the...

 
Third class lever
54

The formula for force is

 
mass times acceleration
55

The maximum weight, W, that can be lifted as shown with a pull of 100 lbs is


100...

 
200 lbs
56

A 5 kg wad of clay is tied to the end of a string. A 300 gm copper moving horizontally is...

 
8.3 m/s
57

Which exerts a larger force over a distance?


A small force over a long...

 
A small force over a long distance
58

The formula for Work is

 
Force x distance
59
The formula for Efficiency is
 
Workout/Workin , since friction causes inefficiency. The fraction is never greater than...
60
A force acting on a surface is called pressure, and is calculated by
 

Pressure = Force / Area


Can be used for fluid pressure and atmospheric...

61

An observer standing on the ground sees you running 55 mph. If you were running towards...

 
45 mph
62
A 300 lb weight rests on a hydraulic surface with an area of 376 square inches (2 square ft)....
 
28.8 lbs
63

Pressure in liquids that are not moving is called ________ pressure, and is caused by ______....

 
hydrostatic/gravity/increases
64

____________ pressure is caused by the weight of the air between the earth's surface and...

 

Atmospheric

65
Energy travels from objects of different temperature in the form of _____ through the process...
 
Heat
66

_________ occurs in liquid and gases by calculating currents caused by a difference in density....

 
Conduction/Convection/Temperature
67

Electrical forces are caused by electrical charges which may be positive or negative.

Which...

 
Electrical forces decrease as the distance between charge particles increases.
68

This circuit element dissipates energy through heat


Resistors

Capacitors

Inductors

Diodes

Transformers

 
Resistors
69

This circuit element stores electrical energy between two parallel plates


Resistors

Capacitors

Inductors

Diodes

Transformers

 
Capacitors
70

This circuit element stores magnetic energy


Resistors

Capacitors

Inductors

Diodes

Transformers

 
Inductors
71

This circuit element restricts current to only one direction. A semiconductor used as a...

 
Diodes
72

This circuit element is used to convert electricity from one voltage to another


Resistors

Capacitors

Inductors

Diodes

Transformers

 
Transformers
73
The two kinds of circuits that you are responsible for are:
 

Parallel circuits

Series circuits

74
These kinds of circuits are identifies by seeing sever circuit elements, (resistors, lights,...
 
Parallel circuits, and in this circuit, the current gets divided between two or more elements
75
In these kinds of circuits, all of the circuit-elements are in a row along a single wire similar...
 
Series circuits, and in this circuit, the voltage will continue to drop as it passes through...
76
What is Ohm's law?
 

I = V/R

77
As you follow the path of the current from the positive node away from the battery and through...
 
Voltage drop
78

The theory behind leverage is that the longer the lever, the more ______ u produce.


force

torque

distance

weight

 

torque, which is the product of force and distance

79

Doubling the length of the lever-arm would ________ the torque that you apply.


 
double
80

The torque created by the hand must _______ the torque produced by the weight before it...

 
Equal
81

Left Side:

Force = 60 lbs

Distance to fulcrm = 8 ft


Right...

 
32 lbs
82

The _______________ of a lever is calculated by dividing the arm-length that you are applying...

 

Mechanical Advantage


83
What is the formula for the Mechanical Advantage of a lever?
 

Effort Arm / Resisting Arm


MA = length of effort arm ÷ length of resistance...

84

What is the Mechanical Advantage of in the diagram?


1

1.44

1.88

2

 
1.88
85

You may see problems where weights and forces are acting on a single lever arm. It's possible...

 
clockwise and counterclockwise
86

Solve for the unknown force or distance


11 lbs

15 lbs

10.9...

 
11 lbs
87

A pendulums has three  weights attached, each 8 in away from each other. One string...

 

a) The one with the longer string takes the longest to make one complete swing

The...

88

You had two tennis balls and held them over a 10 story building, and you dropped Tennis...

 
They hit the ground at the same time
89

Pushing a weight up an incline requires only a fraction of the force needed to lift the...

 
all of the above
90

For a height of 5, and a slope-length of 10, the Mechanical Advantage in the diagram is


10

15

1

2

 

2

91

The mechanical advantage for a pulley system


a) equals the number of...

 

equals the number of ropes within the system


Only MOVEABLE pulleys...

92

The load is supported by how many strands of rope?


1

2

3

4

 

3

93

If the pull of the truck in the diagram is 100 lbs, what is the maximum weight of...

 

400 lbs


NOTE: Also the weight will raise 1 ft for every 4 ft you...

94

When several ropes are in contact with the weight, they all contribute equally. Tension...

 

the force that the rope sustains internally


the force that is needed...

95

In the figure, there are ropes holding the weight up. Therefore they each contribute ____...

 
1/3
96

This specifies the change in position of a point in reference to a previous position. In...

 
Displacement
97

R = (D*R)/d is the formula for


Radius

Range

Gear Revolutions

 

Gear Revolutions


r=(D*R)/d ; r*d=R*D

98

Hydrometers use floats to measure


specfic gravity

displacement

hardness...

 
specfic gravity
99

Specific gravity is the weight of a ______ compared with the weight of the water.


solid

gas

liquid

mass

 
Liquid
100

The liquid with the highest specific gravity will cause


the float to rise...

 
the float to rise higher in the glass tube
101

Pliers and scissors are ________ levers and explain where the fulcrum of the lever is.


First...

 

First class.


The fulcrm is in the middle

102

A nutcracker or wheelbarrow are _________ levers.


First Class

Second...

 

Second class.


The fulcrum is at one end, load is in between.

103

Tongs or tweezers are examples of _________ levers


First Class

Second...

 

Third Class


Fulcrum is at one end, effort is in between.

104

In pulley's, the smaller pulley will turn _______ than those larger than it.


Faster

Slower

Same...

 

Faster


It has to "keep up" and therefore turns faster.

105

a* d = A * D


a = area

d = displacement

A = bigger area

d...

 
Mechanical Advantage in a piston
106

An axe is classified as a wedge, which is an


inclined plane

first...

 
inclined plane
107

The __________ the fulcrum is from the resistance arm, the __________ amount of force that...

 
closer, greater, higher
108

No electricity flows through burnt out bulbs, but a ________ can bypass it if connected...

 
voltimeter
109

Which of the following is true:


Current and Voltage varies in a parallel

Current...

 

Current is constant in a series, voltage is not


Current * resistance =...

110
The current with the _______ resistance is usually in series, because it forces the current...
 
greater
111

In a 2 pulley system, the movable pulley will only move up half the distance, and spin half...

 
No answer. That was a statement.
112

What is the rpm for this wheel, that requires 2 contacts per second?


15

16

48

8

 

15


twice per second = 120 contacts per minute. 8 rods on wheel. 120/8=15

113

Heat is a form of


calories

motion

energy

pressurization

 
energy
114

On a standard day, at sea level, assuming static conditions, the speed of sound is


1100...

 
1100 ft per sec
115

For a plane to fly, air flowing over the top of a wing creates a vaccum, while the air flowing...

 
a) remains at approximately the same air pressure
116

The diagram depicts airflow around the wing of an aircraft. Most of the lift is caused by


a)...

 
d) decreased air pressure on the top side (side A)
117

In the diagram, which of the ff statements is not true?


a) pulley 2 would...

 

c) pulley 1 would spin faster than pulley 3


according to the book

118

Which tool below is the best for cutting metal?


hacksaw

chainsaw

rotary...

 

hacksaw


hacksaw was designed for metal.

119

Which of the ff is a type of lever?


elevator

seesaw

door...

 
seesaw
120

What is the formula of force for a lever?

 

Fᴱ = FL dL / dᴱ


Formula can be changed to

Fᴱ dᴱ = FL...

121

Approx how much force must be exerted to lift the box?


67 lbs

100...

 

67 lbs


Fᴱ dᴱ = FL dL

Fᴱ 30ft = 200lb * 10ft

Fᴱ...

122

Which wrench would require more force to turn a bolt?


Wrench A

Wrench...

 
Wrench A
123

In order to move the block five feet, how many feet of rope would have to be pulled?


5

10

15

20

 
15
124

The number of cranks the crankshaft of a V-6 engine has is


2

4

6

8

 

6


6 pistons, 1 crank per piston

125

Pulley A is the same size of Pulleys B and C, and twice the size of Pulley D. For each revolution...

 

two


according to the book, two.

126

In order to lift a 100 lb load onto a dock five feet high, using only 25 lbs of force, how...

 

20 ft


100 / 25 = 4

4 = required MA for an inclined plane

4...

127

One horsepower is equal to


a) 33,000 ft-pound work per min

b)...

 
a) 33,000 ft-pound work per min
128

In the diagram, how many pulleys are turning in a clockwise direction?


one

two

three

four

 

four


according to the book, 4

129

Wheel A has a diameter of 10 inches. Wheel B has a diameter of 25 inches. If both revolve...

 
Wheel B
130

How many gears are turning in a counterclockwise direction?


two

three

four

five

 
three
131

If Gear 1 has revolves twice, how times will Gear 2 revolve?


1

2

3

4

 

1


The picture would have 2 gears, a small 10 tooth, and a large 20...

132

In the figure, for each complete revolution of the cam, how many times will the valve open?


1

2

3

4

 
3
133

What is the area of a cylinder?

 

2(π r²) + (2 π r)* h

134

In the hydraulic system depicted, the cylinder on the left has a diameter of 2 inches and...

 

900 lbs


135

In the design, which tank(s) will overfill?


Tank A

Tank B

Tank...

 
Tank A and C
136

Which of the following are not parts of a braking system of an automobile?


discs

master...

 

axel

137

On a braking system, the axel supports the wheel, but is not part of the braking system....

 
master cylinder
138

When a machine magnifies force, it is referred to as


magnification factor

mechanical...

 
mechanical advantage
139

A pitch is


a) the distance between the threads of a screw

b)...

 
a) the distance between the threads of a screw
140

When an object is at equilibrium


a) its velocity does not change

b)...

 
a) its velocity does not change
141

Equilibrium is


a) when at object is at rest

b) when 2 or more...

 

b) when 2 or more forces act to cancel the effects of each other


An object...

142

An example of a simple machine is


a door hinge

light switch

can...

 
all of the above
143

When a helium-filled ballon rises, the force responsible is


friction

air...

 
air pressure
144

In physics, power can be defined as


work/time

energy/efficiency

leverage/mass

friction/drag

 
work/time
145

The force acting on an object dropped from a building is


buoyancy

elastic...

 
gravity
146

If you remove your foot from the gas pedal in ur car, it will slowly coast to a stop. The...

 
friction
147

If a driver wheel is present, the adjacent wheels will rotate according to how _________...

 

close


The closer to the center, the faster it will move.

148

By increasing the length of the lever arm, the effort is increased, enabling a valve to...

 

b) moving the lever farther will cause less effort


NOTE: ...and lets the...

149
What is the formula to find the volume of a sphere?
 
4/3π r³
150
What is the formula to find the area of a sphere?
 
4 π r²
151

If two weights hang from two different strings attached to a bar, less pull is exerted by...

 
b) the length of the string does not matter
152

The deeper you go with an inflated ball, the more difficult it is to hold it underwater....

 
b) will increase, depending on how deep you go into the water
153

Rate of heat exchange is _____ through objects of greater temperature difference


slower

the...

 
faster
154

Think about putting your thumb on the end of a hose makes the water spray.


a)...

 
c) all of the above
155

This kind of engine consists of an intake, compression, combustion, and exhaust.


2...

 
4 stroke
156

What is the mechanical advantage of a wheel and axle?


 

radius of axel to handle divided by the radius of the drum


radius(axel...

157

Statics and Equilibrium

Formula for a moment?

 
Force * distance
158

________ energy is stored in an object while _________ energy is energy in motion.


Kinetic,...

 
Potential, Kinetic
159

I = Q/T

Define I, Q, T


Current, charge, time

Voltage,...

 
Current, charge, time
160

This device measures the current flow in a circuit


Ammeter

Voltmeter

Multimeter

 
Ammeter
161

This device measures does the job of both measuring the flow in a current and the voltage


Ammeter

Voltmeter

Multimeter

 
Multimeter
162
The formula for Power is
 
Power = volts * amperes
163

Units for a charge is


coulomb, C

ampere, A

volts, V

watts,...

 
coulomb, C
164

Units for current flow are


coulomb, C

ampere, A

volts,...

 
ampere, A
165

Vise


MA = (2*pi*length of handle) divided by what?


 
pitch of thread
166

Formula of Weight is


Mass * Gravity

Gravity is equal to


9.81...

 

9.81 m/s²


All the other answers are off by 0.1 only.

32.2...

167

The formula for Density is

 
Mass / Volume
168
The formula for Relative Density is
 
Density / Density(Reference Material)
169

If you add salt into a liquid, the solution has a lower freezing point. This is because


a)...

 

a) there is an increase in specific gravity


Specific gravity usually means...

170

Heat always


distributes between objects

travels from hot...

 
travels from hot to cold
171

Compressing air in a closed place will decrease the volume and raise the temperature


a)...

 
True
172

A square plate is hanging by 4 wires (one on each corner). One breaks, and it's hanging...

 
b) the 2 diagonally across from each other hold an equal amount that is more than the lone...
173
Will an airplane with engine and propeller take off on a treadmill or converyor belt, regardless...
 

174
Will a glider (no engine or propeller) take off on a treadmill or converyor belt, regardless...
 

175

A common example of a first-class lever is


a seesaw

a wheelbarrow

tongs

 
a seesaw
176

The force F required to balance the weight of 60 lbs on the lever, shown in the diagram...

 
210 lbs
177

The mechanical advantage shown is


4

5

8

 
5
178

What effort must be exerted to the handles of the wheelbarrow shown carrying a load of 200...

 
50 lbs
179
The bar, which is exactly 4 inches in length, has a 275 lbs weight on one end and a 125 lb...
 
1 1/4 inches
180

Neglecting friction, what is the mechanical advantage in using a single fixed pulley as...

 
1
181

In the figure shown, the pulley system consists of a fixed block and a moveable block. Neglecting...

 
50 lbs
182

The weight W is to be raised as shown in the figure by attaching the pull rope to the truck....

 
24 ft
183

The formula for an inclinded plane is

MA = L/H


MA = mechanical...

 

H = height


MA = L / H

L = length

184

A gradual slope will provide a ________ mechanical advantage than a steep slope.


higher

lower

 
higher
185

In the figure shown, the service person is using a plank to roll a 300-pound barrel...

 
100 pounds
186

How do you find the mechanical advantage for a wheel and axel?

 
Diameter/Radius
187

In the figure shown, a bucket is being raised by a wheel-and-axel arrangement. If the distance...

 
4
188

To make a 1/2" hole in a block of wood, use tool


A

B

C

 
B
189

To cut a thread on a 1/2" brass rod, use tool


A

B

C

 
A
190

The number 18 appearing on the tool shown above indicates


depth of...

 
threads per inch
191

Which of the 1½ volt dry cell battery connections shown above will deliver 6 volts?


1

2

3

 
2
192

In the figure given, if the thickness of the wall of the pipe is ½", the inside diameter...

 
3"
193

The figure above represents a revolving wheel. The numbers 1 and 2 indicate two fixed points...

 
c) points 1 and 2 make the same number of revolutions per minute
194

In the figure shown, if gear A makes 14 revolutions, gear B will make


14

17

21

 
21
195

With the wheels in the position shown in the figure


a) wheels S and T will...

 
b) wheels S and T will rotate in the same directions
196

In order to open the valve four times every second, the wheel must rotate at


12...

 

24 rpm


4 times every second = 240

10 rods on the wheel

240/10

197

In the figure shown, a 160-lb individual jumps off an 800-lb raft to a point in the water...

 
a) 2 ft in the opposite direction
198

The figure shows a lever-type safety valve. It will blow off at a lower pressure if weight...

 
moved to the left
199

As shown in the figure, four air reservoirs have been filled with air by the air compressor....

 
100 lbs
200

In the figure above, the number of complete turns the vise handle must make to fully close...

 
18
201

In the figure shown, the center-to-center distance between the two poles is


1...

 
1 15/16"
202

If an 8" level indicates 16 quarts of oil in the tank, then the number of quarts of oil...

 
4 quarts
203

Which illustration depicts the compression stroke?


X

Y

Z

 

Z


Both valves are closed and the piston is moving upwards

204

What is the proper sequence of the four strokes of a piston in a gasoline engine


W...

 
Y Z X W
205

The gauge shown above is a


depth gauge

feeler gauge

thread...

 

thread gauge


The thread or screw-pitch gauge is used to determine the pitch...

206

The wrench shown is generally used when


a) a definite force must be applied...

 

a definite force must be applied to a nut or bolt head


The torque is read...

207

Which of the figures shown is the proper procedure for pulling adjustable wrenches?


A

B

Both...

 

A


The handle of the adjustable wrench should be pulled toward the side...

208

Every object in a state of uniform motion tends to remain in that state of motion unless...

 
True
209

Newton's Law describes a  relationship between an object's _______ and _______ as the...

 
mass, acceleration
210

In Newton's Third Law, force


a) is neither created or destroyed

b)...

 

c) always elicits an equal, opposite force acting against it


Whenever a...

211

A 150 lb man jumps off a 600 lb raft to a point in the water 12 ft away. Theoretially, the...

 

3 ft in the opposite direction


150 lb x 12 ft = 600 lb x ? ft

212

The mechanical advantage of a lever can be increased by


a) placing...

 
d) both a and c
213

A lever arm is in balance when the force x length of one side of a fulcrum is equal to the...

 

10 lbs

214

Then tension of a string in figure A is greater than the tension of a single spring in Figure...

 
L) Three times greater than in B
215

Pulleys. Which of the following is always not true about a pulley.


a) a...

 
e) all of the above
216

What amount of force is required to move the weight (assume the supported objects all weight...

 
50lbs
217
What amount of force is required to move the weight (assume the supported objects all weight...
 
33.3 lbs
218
What amount of force is required to move the weight (assume the supported objects all weight...
 
25 lbs
219

The immoveable one pulley system provides ___ the force to lift the object and will have...

 

1/2


There is 1 rope. Divided evenly into 2, and no mechanical advantage,...

220

If the pulley is immoveable, what is the minimum force that must be applied to position...

 
10.1 lbs over 3 ft
221

This is Boyles Law:


a) Compressing a gas to 1/2 volume doubles the...

 

c) Both A and B


Actually, Boyle's law describes the inversely proportional...

222

Charles' Law is when


a) you heat some liquid, and the temperature changes,...

 

b) you open a can of coke, and the soda starts fizzing out


If gas is...

223

Bernoulli's Principal is when


a) a good pitcher throws a curve ball

b)...

 

d) both a and b


Bernoulli's princiapl states that as the velocity of...

224

The higher the altitude, the more dense the air.


True

False

 
False
225

The deeper an object is submerged, the more pressure is exerted upon it.


True

False

 
True
226

Which of the statements about weight are true?


a) Weight is the same closer...

 

b) Weight is greater on planets with greater mass


Mass does not change...

227

If Gear R is the

driver, at the moment shown, Gear S is


P) not moving

Q)...

 
T) moving in the opposite direction as Gear R
228

If Gear A makes 14 revolutions, gear B will make


A) 9 revolutions

B)...

 
D) 21 revolutions
229
_______  is the factor or ratio by which a mechanism multiplies the force or torque applied...
 

Mechanical Advantage


Output force

 Input force


or


distance...

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