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Class 4 Prep > Book 1 > Flashcards

Book 1 Flashcards

1
Q

The ability of a material to resist penetration is called
Select one:
• a. Elasticity
•b. Toughness
• c. Hardness
• d. Ductility

A

c. hardness

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2
Q

A gas processing plant has a vessel with a mass of 5 tonnes, what is the force of gravity
exerted on this vessel?

• a. 49.05 N
• b. 4.905 N
•c. 490.5 N
•d 49 050 N

A

d. 49 050 N

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3
Q

One newton is equal to:
Select one:
• a. 1 kg/s^2
• b. 1 kgm/s
• c. 1 kgm/s^2
• d. 1 kgm^2/s

A

C. 1 kgm/s^2

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4
Q

Find the coefficient of friction between a 73kg cubic box
measuring 3m on each side and a hardwood floor, 16m long and 20m
wide, if a force of 236N is required to start the box noving.

Select one:
1. 0.33
2. 36 N
3. 3.20
4. 3.033

A
  1. 0.33
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5
Q

Idler gears:

Select one:
a. Are used to reverse the direction of the gear rotation.
• b. Create slippage
• c. Change the r/min of the driven gear.
• d. Increase efficiency.

A

a. Are used to reverse the direction of the gear rotation.

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6
Q

If several balanced forces are acting on a body and no change in movement takes place, what
state are the body and system of forces said to be in?

•a. Equilibrium
• b. Equal momentum
• c. Magnitude
• d. Homeostasis

A

a. Equilibrium

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7
Q

In a belt drive system, if the driver is smaller than the follower the:

Select one:
A. Follower will turn at the same speed as the driver.
B. Both follower and driver will tul at the game speed.
C.Follower will turn slower than the driver.
D.Follower will turn faster than the driver.

A

C.Follower will turn slower than the driver

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8
Q

The unit used to indicate acceleration in the SI system is:
1. m/s^2
2. m/s
3. m^2/s
4. km/s

A

m/s^2

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9
Q

What is the name for a single support on which a pipe can rotate freely?

A.Equilibrium
B.Upward force
C.Fulcrum
D.Downward force

A

C. Fulcrum

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10
Q

A 5m long bar is pivoted on the right end and a force of 10N is applied upwards on the left end. The moment of force is:
Select one:
A. 2Nm counter- clockwise
B. 2Nm clockwise
C. 50 Nm counter- clockwise
D. 50 Nm clockwise

A

D. 50 Nm clockwise

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11
Q

A machine lifts a load of 2 kN a distance of 3 m and the effort applied is 400 N.
What distance wil the effort move if the efficiency of the machine is 80%?

A. 20.50 m
B. 2.083 m
C. 1.875 m
D. 18.75 m

A

D. 18.75 m

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12
Q

A lever is 3m long and is pivoted at one end. A load of 8000 N is suspended from
the lever at a point 1m from the pivot. What force must be applied at the other end of the lever
to obtain equilibrium?

Select one:
A.2666.667 N
B.1333.333 N
C.16 000 N
D.24 000 N

A

A. 2666.667 N

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13
Q

The “coefficient of friction* is defined as the:
Select one:

A.Ratio of the force required to move a body to the normal reaction force.
B.Forco paralel to the surfaco required to start an object moving.
C. Reaction perpendicular to the surface.
D.Force parallel to the surface required to keep an object moving at a constant linear
velocity.

A

A.Ratio of the force required to move a body to the normal reaction force.

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14
Q

If a person pushes on a rock with a force of 300N and the rock does not move,the amount of work done is:
Select:
A. 300 N
B. 300 J
C. 150J
D. Zero J

A

D. Zero J

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15
Q

A titanium bar with a mass of 2 kg and a length of 3m shortens by 0.02 mm under a compressive load of 3900 kN. What is the strain?
Select:
A. 1.9 * 10^-3
B. 6.66 * 10^-3
C. -1.9 * 10^-2
D. 0.0000666

A

D. 0.0000666

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16
Q

Find the mass of the refrigerator that is just started moving by a force of 6350N along a tile floor with a coefficient of friction of 0.30.
Select one:
a. 2157.66 kg
b. 21.2 tonnes
c. 1905 kg
D. 0.0 4 g

A

2157.66 kg

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17
Q

‘m/s’ is the SI unit for:

• a. Acceleration
• b. Velocity
• c. Force
• d. Mas

A

b. Velocity

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18
Q

A lever is used to move a load of 10kN by applying an offort of 1000N. What is the mechanical advantage of the lever?
Options:
A. 1
B.10
C.100
D.1000

A

b. 10

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19
Q

Find the coefficient of friction between a 200 kg box and a horizontal concrete floor. A
horizontal force of 560 N is required for the box to start moving.
Options:
A. 0.285
B.3.5 N
C.0.285 N
D.3.5

A

0.285

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20
Q

A vector quantity has which two properties?
1.Magnitude and force
2.Magnitude and direction
3.Magnitude and velocity
4.Magnitude and displacement

A

Magnitude and direction

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21
Q

What is the advantage of a gear drive over a belt drive?
• а . No slippage
b. Transmits less power
c. No need for lubrication
• d. Low maintenance cost

A

No slippage

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22
Q

A deforming force of 250 N is applied to a body with an area of cross section equal to 10 m2.
Calculate the stress in the body.
A.25 Nm2
B.25 N/m2
C. 25 N
D.2.5 N/m2

A

25 N/m2

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23
Q

Any action on a body that tends to change its size, shape or state of motion is defined as:
Select :
A.Displacement
B.Acceleration
C.Volume
D.Force

A

Force

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24
Q

What is the force of gravity exerted on a gas processing plant vessel that has a mass of 5
tonnes?

a. 49.05 N
b.4.905 N
c.490.5 N
d.49 050 N

A

49 050 N

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25
Q

The ability of a material to retain its deformed shape
when the load causing defornation is removed is called:

a . S t i f f n e s s
b. Ductility
c Hardness
d. P l a s t i c i t y

A

Plasticity

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26
Q

The handle of a small hand pump is 850mm long. The fulcrum is attached at one
end and the load plunger is located 50mm from the fulcrum. An effort of 600N is applied
downward at the opposite end from the fulcrum. Find the force exerted by the load plunger and
the mechanical advantage of the lever.
Select one:
A. 10 200 N,17
B. 1020 N ,17
C.102 N, 17
D. 10.2 N ,20

A

10 200 N,17

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27
Q

What is velocity?
A.Constant
B.Vector
C.Standard
D.Average

A

Vector

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28
Q

How is force defined?
• a. The product of the force applied on an object and the distance through which the
force moved
b. The measure of force per unit area
c. A push or pull on an object that may change its state of motion
d. A push or pull on an object that will not move

A

A push or pul on an object that may change its state of motion

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29
Q

A pulley with a diameter of 50 cm is driven at 960 r/min. What will be the linear
speed, in m/s, of a point on the rim of the pulley?
Select one:
• a. 150.8
• b. 50.2
C.25.2
• d. 6.3

A

25.2

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30
Q

Acceleration may be defined as the rate of change of:
Select one:
a. Time
Distance
Displacement
d. Velocity

A

Velocity

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31
Q

In the SI system, the standard unit when indicating force is the:
Select one:
• a. Newton
• b. MJ
C. kg force
D.Nm

A

Newton

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32
Q

A simple wheel and axle has a wheel diameter of 2.3m and
an axle diameter of 92mm. If an effort of 26N is required to raise a
mass of 16kg, what is the efficiency of the machine?

Select one:
a ) 2 . 4 6 %
B) 95.3%
C) 24.1%
• d)20.1%

A

24.1

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33
Q

A car accelerates uniformly from rest to 6.1 m/s in 40 seconds. It continues at this
velocity for an additional 60 seconds. Then it decelerates to a stop in 10 seconds. If the car
traveled in a straight line during this time, determine the final distance from its original position.
Select one:
671 m
9.15 m
518.5 m
122 m

A

518.5m

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34
Q

A round bar, 1.5 m long and 45mm diameter, stretches 1.2 mm under a tensile
load of 240 kN. Calculate the stress in the bar, in MPA.
Select one:
53.3
106.6
150.9
288

A

150.9

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35
Q

In a belt drive system, the input to the driver pulley is
265kh and the output is 211kk. What is the efficiency?

Select ono:
121%
93.3%
79.6%
82.4%

A

79.6

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36
Q

What is the internal resistance to an applied external force?
Options:
1.stress
2.strain
3. Ultimate Strength
4. Load

A

Stress

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37
Q

What term is used to refer to vectors that are all in the same plane?
a. Coplanar vectors
Scalar vectors
c. Planar vectors
Concurrent vectors

A

Coplanar vector

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38
Q

A 7m long bar is pivoted at 2m from the loft end. A force
of 60N is applied downwards on the left end and a force of 20N is
applied downward on the right end. What would be the clockwise and
counter-clockwise moments about the pivot, due to each force, and in
which direction would the bar rotate?
Select one:

Select one:
• a. 80Nm counter-clockwise, 100Nm clockwise, counter-clockwise
b.60Nm counter-clockwise, 100Nm clockwise, clockwise rotation.
c. 120Nm counter-clockwise, 100Nn clockwise, counter-clockvise
rotation.
d. 120 Nm counter clockwise,100Nm clockwise, clockwise rotation

A

c. 120Nm counter-clockwise, 100Nn clockwise, counter-clockvise
rotation.

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39
Q

A plane is flying at 156 km/h at a bearing of 65* north of east. After flying for 3
hours, the planes bearing is changed to due north and it continues flying for a further 1 hour at
156 km/h. How far away from its original position and at what bearing is the plane’s new
position?

Select one:
• a. 624 km at 81* north of east
• b. 624 km at 86° north of west
• c. 616 km at 71* north of east
O d. 312 km at 25° east of north

A

• a. 624 km at 81•north of east

40
Q

Static friction is:
Select one:
• a. Always less than kinetic friction.
• b. The force required to keep an object moving.
• с.Less than the force required to keep an object moving at a
constant speed.
• d. Always greater than kinetic friction.

A

• d. Always greater than kinetic friction.

41
Q

Stiffness is defined as the ability of a material to:
A. Return to its orignal shape after the load causing deformation is removed.
B. Retain its deformed shape when the the load causing deformation is removed.
C.Resist a change in shape and size when a load is applied.
D.Resist penetration

A

C.Resist a change in shape and size when a load is applied.

42
Q

If a driver pulley with a diameter of 2m is moving at 3000 rew/min, what is the speed of a
driven pulley with a diameter of 0.5 m?
Select:

A. 1200 rev/min
b. 750 rev/min
c. 12 000 rev/min
d. 3000 rev/min

A

C. 12 000 rev/min

43
Q

What term is used to refer to vectors with lines of action that meet at one point?
a. Coplanar vectors
• b. Planar vectors
c. Scalar vectors
d.concurrent vectors

A

Concurrent Vector

44
Q

A driver pulley with a 200 mm diameter is driving a pulley with a 100 mm diameter. How many
times does the driven pulley revolve per one revolution of the driver?
A. 1.5
B.4
C.0.5
D.2

A

2

45
Q

In a lifting machine, the effort applied moves a
distance of 5m while the l o a d moves 50mm. What i s the velocity ratio?
Options:
A). 0.1
B) 1
C) 10
D)100

A

100

46
Q

In simple machines, ‘efficiency is:
1.Work Input * Work Output
2. Work input / Work Output
3. Work output+Work Input
4.Work Output / Work Input

A

4.Work Output / Work Input

47
Q

A pump raises 650 tonnes of pure water a height of 55m i n
6 hours. If the pump efficiency i s 100%, what is the power required
to drive the pump?
Options:
A) 16.24 kW
B)350 707.5 W
C)17.46 kW
D) 1047.51 kN

A

A) 16.24 kW

48
Q

A hydraulic piston with an area of 0.05 m is being moved with a force of 150N.
What pressure is being exerted on the piston?

A ) 300 Pa
B ) 30 kN/m^2
C ) 3 КРа
D )75 kPa

A

3 kPa

49
Q

Displacement is:
Select one:
• a. A vector quantity
• b. A scalar quantity
• с. Measured by the actual path the object travels
• d. How far an object has move

A

Vector quantity

50
Q

Find the force required to move 25 kg block along a horizontal floor if the coefficient of sliding friction is 0.19?
Options
A) 4.28 kN
B) 4.28 N
C)46.6 N
D) 4.66 kN

A

C) 46.6 N

51
Q

A simple wheel and axle has a wheel diameter of 3m and an axle diameter of 25
cm. What effort is required to lift 850 kg if the efficiency is 87%?
Select:
A. 798.7 N
B. 976 N
C. 100.5 N
D. 563.2 N

A

798.7 N

52
Q

The ability of a body t o do work by virtue of its
position is body’s _________energy.
Options:
1. potential
2. Kinetic
3. Maximum
4. Minimum

A

Potential

53
Q

The force of friction is:

Select one:
• a. Dependent on the area of the two surfaces in contact.
• b. Not affected by the roughness of the two surfaces in contact.
• с. Applied in the vertical direction.
• d. Not affected by the area of the two surfaces in contact.

A

• d. Not affected by the area of the two surfaces in contact.

54
Q

Which load to effort ratio is called the actual mechanical advantage?
A. Effort + Load
B. Effort = Load
C. Load * Effort
D. Load /Effort

A

Load divided by Effort

55
Q

A driven pulley has a diameter of 1.5 m. This pulley is driven by a belt drive from a 0.5 m
diameter pulley that rotates at 150 rev/min. What are the revolutions per minute of the driven
pulley?

A. 112.5 rev/min
B. 200 rev/min
C. 450 rev/min
D. 50 rev/min

A

D. 50 rev/min

56
Q

Coplanar vectors all occur in the same:
A. Plane
B. Direction
C. Magnitude
D. Velocity

A

Plane

57
Q

Unit of stress?
A. mm/m
B. kPa
C. kg/cm^2
D. kg/m^2

A

kPa

58
Q

To start a body moving, which of the following must be
overcome?

Select one:
• a. Kinetic friction
• b. Static friction
• c. Fluid friction
• d. Rolling friction

A

Static Friction

59
Q

1.4) A simple machine is required to raise 1 tonne of stones a vertical distance of 30m.
If the efficiency of the pulley is 100%, how much work must be done on the pulley to raise the
stone?
A. 294.3 J
B. 30 kJ
C. 35 kJ
D. 294.27 kJ

A

294.27 kJ

60
Q

When a body falls from a height, what is its potential energy converted to?
• a. Kinetic energy
• b. Friction
• с.Power
• d. Watts

A

Kinetic energy

61
Q

In simple machines, ‘velocity ratio’ i s defined as:
Select one:
question
•a. The reaction at the fulcrum t o balance t h e net forces on the
system
• b. The ratio of t h e load t o the effort
• c. T h e ratio o f t h e distance moved by t h e effort t o the distance
moved b y the l o a d
• d. T h e r a t i o o f t h e work output t o the work input

A

• c. T h e ratio o f t h e distance moved by t h e effort t o the distance
moved b y the l o a d

62
Q

With static or kinetic friction, the force of friction is proportional to the ___ that presses the two surface together.
Select:
A. Pressure
B. Mass
C. Force
D. Energy

A

Force

63
Q

A train starts of from rest and reaches a velocity of 100kmh in 8 minutes. If the velocity increases uniformly, how far wil the train travel during the first 8 minutes?
Select:
A. 6.67 km
B. 7.43 km
C. 8.50 km
D. 9.25 km

A

6.67 km

64
Q

A uniformly applied force, acting a t right angles t o al
surface, divided by the surface area, i s defined as:

Select one:
• a. Acceleration
b . P r e s s u r e
C. weight
• d. Surface a r e a

A

Pressure

65
Q

What is the force of gravity exerted on an object that has a mass of 5.2 tonnes?

A. 5.10 N
B. 5101.2 N
C. 51 012 N
D. 51.01 N

A

51 012 N

66
Q

If a force of 1400 N, applied in the direction of movement, wil cause continued
steady movement of a 400 kg crate. Calculate the coefficient of kinetic friction.

a. 3.6
b. 5.6
C. 0.56
D. 0.36

A

0.36

67
Q

A mass of 400 kg is moved a horizontal distance of 30 m due to a force of 300 kN. What is the
amount of work done?
a, 9000 J
B. 12 000 kJ
C. 12 000 J
• d. 9000 kJ

A

9000 kJ

68
Q

When a body with a mass of 250 kg is moved upward a distance of 15 m in 1 s, how much
power is developed?

a. 3750 J/s
b. 2646 J/s
c.3344 J/s
d. 36 790 J/s

A

3344 J/s

69
Q

A car has initial velocity o f 25km/hand in 84 seconds
it accelerates to 110km/h. How far did it travel while acceleratin

a. 2575 m
b. 1575 m
c. 757 m
d. 575 m

A

1575 m

70
Q

A block and tackle system has 3 pylleys in each of two blocks. If a downward effort of 100 N is aplied and t h e machine has
an efficiency of 83.6%, what is the maximun mass that can be lifted?
a. 501.6 kg
b. 51.1 kg
c. 5113.1 kg
d.250 kg

A

51.1 Kg

71
Q

Velocity may be defined as:
Select one:
• a. Speed
• b. Linear speed
c.Speed in a given direction
d. Speed in a given time

A

c.Speed in a given direction

72
Q

A 4 m long exchanger tube shortens by 4 mm under compressive load. What is the strain?
a.1.0
b.0.001
c.0.0001
d. 0.01

A

0.001

73
Q

A hole 3 cm in diameter is to be punched out of a steel plate that is 8 cm thick. The
shear stress of the material is 670 GPa. What forco is required on the punch?
Options:
A. 4 735 509 GN
B. 5051.6 MN
C. 1.6 * 10^13 N
D. 9036 MN

A

5051.6 MN

74
Q

A large gear with 50 teeth interacts with a smaller gear with 15 teeth. If the larger gear rotates
at 100 rev/min, determine a) the gear ratio, and b) the speed of the smaller gear.
Options:

a) 0.3, b) 333.33
a) 3.33, b) 333.33
a) 0.3, b) 30
a) 3.33, b) 30

A

a) 3.33, 6) 333.33

75
Q

The ratio between the ultimate strength and the allowable
stress iscalled the:
Select one:
a. Ultimate stress
• b. Maximum alowable loas
c.Working stress
• d. Safety factor

A

Safety factor

76
Q

A force of 320kN acts perpendicular t o a lever arn, at a
distance of 4m from a point. What turning moment does the force
produce about the point?
Options:

lect one:
a. 80kNm
b. 1280 kNm
c1280 KN
d. 1280 Wats

A

1280 kNm

77
Q

How is acceleration defined?

a. Change of velocity divided by time taken to change
b. Time taken to change divided by velocity
c. Velocity divided by acceleration
d. Acceleration divided by velocity

A

a. Change of velocity divided by time taken to change

78
Q

Which ofthe folowing statements about belt drive
systems is FALSE?

lect one:
• a. Linear speed o n a point o f each pulley will be the same as the
linear speed o f the belt.
• b. Tension in the botom belt is always”double that in the top
b e l t .
c.Belt driver pulleys move follower puleys by neans o f
frictional force betwen the belt and the pulleys.
d. Rotational speed wil be equal i f the puley diameters are
equal.

A

b. Tension in the botom belt is always”double that in the top
b e l t .

79
Q

What is the power required to apply a 200KN forca over a distance of 15m in 15 seconds
Select:
4000 kW
3000 kW
200 kW
60 kW

A

200 kW

80
Q

Calculate the strain if a bodys original length is 20 cm and the length after stretching is 20.4
cm.
Options:
2
0.002
0.2
0.02

A

0.02

81
Q

A 28-tooth gear turns a t 100 rpm and drives a 112-toothgear. What is the speed of the folower gear?
Options:

a. 40 грm
b. 25 грm
C. 31.36 грm
d. 125.44 rpm

A

25 rpm

82
Q

A rock is dropped from a bridge and hits the water 4.2 s later. How high is the bridge abovo the
water?
Options:
24.2 m
32.2m
41.2 m
81.4 m

A

41.2 m

83
Q

A lever is used to move a load of 2000 N by applying an effort of 100 N. What is the mechanical advantage of the lever?
Options:
2
20
200
2000

A

20

84
Q

What system does a space diagram illustrate?
•a.System of vectors
• b. System of scalars
•c. Vector diagram
•d. Scalar diagram

A

System of vector

85
Q

1.3)a wheel and an axle has a calculated the diameter of the axle mechanical advantage o f 10.
diameter of t h e whel 30cm.
Options:
3 cm
13.3 cm
2 cm
7 cm

A

3cm

86
Q

An object isdropped from a height of 45m. What wil be
immediately before it hits the ground?
Options:

elect one:
P Flag
question
8 8 2 . 9 m / s
b. 441.5 m / s
• elect one:
P Flag
question
a. 8 2 . 9 m / s
b. 441.5 m / s
c. 2.50 m/s
d. 29.71 m/s
d. 29.71 m /s

A

29.71 m/s

87
Q

A pump is required to raise 600 litres of fresh water a vertical distance o f 120m. If the efficiency o f the pump i s 454, how much work must be done on the pump to r a i s e the water?
1230 kJ
1820 kJ
1570 kJ
1290 kJ

A

1570 kJ

88
Q

The ratio of the load to the effort is called:
a. Velocity ratio
b. actual mechanical advanatage
c. Efficient
d. power

A

Actual mechanical advantage

89
Q

An object is thrown directly downwards from a height of 60 m with an initial velocity
of 1 m/s. What wil be its velocity on impact with the ground?

a. 34.5 m/s
b. 46.7 m/s
с. 24.2 m/s
d. 126.38 m/s

A

36.03 m/s

90
Q

An object is thrown directly downwards from a height of 60 m with an initial velocity
of 1 m/s. What wil be its velocity on impact with the ground?

a. 34.5 m/s
b. 46.7 m/s
с. 24.2 m/s
d. 126.38 m/s

A

36.03 m/s

91
Q

Calculate the work done to raise a 3000 kg boiler a distance of 60 m.
Options:
2.32 MJ
1.77 MJ
2.33 MJ
1.11 MJ

A

1.77 MJ

92
Q

A 68.5kg object is at rest at a height of 65m above the earth’s surface. What is its kinetic energy?
Options:
1 KJ
8 KJ
0 KJ
2 KJ

A

0 KJ

93
Q

The rate of doing work is called______?
Options
Potential
Power
Kinetic energy
Potential energy

A

Power

94
Q

A simple machine i s one that receives energy by seans of
a single applied force and produces work by means of:
Options
Multiple output force
Double input force
Distance moved
Single output force

A

Single output force

95
Q

If a force of 2400 N acts on the bottom of a tank that measures 4 m x 4 m, what is the pressure?
Options:
150 Pa
250 Kpa
200 Pa
152 P

A

150 Pa

96
Q

A body moves in a straight line at 20m/s. Six seconds later it is moving at 35m/s.
What was the acceleration of the body during that time?

  1. 9 167 m/s?
  2. 9.167 m/S
  3. 0.4 m/s?
  4. 2.5 m/s^2
A
  1. 2.5 m/s^2

Class 4 Prep (6 decks)

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