IMT-131 > Chapter 2 Review > Flashcards

Chapter 2 Review Flashcards

(65 cards)

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1
Q

______ indicates the rate that work is done.

A

Power

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2
Q

If 225 kg of force is exerted on a hydraulic cylinder, it is equal to ____ lb of force.

A

495

[ 225 kg x 2.2 = 495 ]

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3
Q

Pressure is typically measured in psi, bars, and ______

A

Kilopascals (kPa)

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4
Q

If a hydraulic cylinder needs to lift a bridge beam that weighs 60,000 lb and the piston in the cylinder has a surface area of 113.10 sq in., then the hydraulic system must produce system pressure of ____ psi.

A

530.50

[ 60,000 lb / 113.10 sq in. = 530.50 ]

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5
Q

Most pump manufacturers recommend a vacuum rating less than or equal to ____ in. Hg.

A

Vacuum rating depends on pump design and manufacturer specifications

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6
Q

A _____ consists of a glass tube that is completely filled with mercury and closed on one end.

A

Mercury barometer

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7
Q

_____ energy is the energy of motion.

A

Kinetic

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8
Q

A common form of inefficiency in a fluid power systems is _____.

A
  1. Leaks
  2. resistance to movement of mechanical devices
  3. resistance in pipes and hoses
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9
Q

______ is anything that changes or tends to change the state of rest or motion of a body.

A

Force

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10
Q

Fluid mechanics is comprised of static energy and ____ energy.

A

Kinetic

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11
Q

Horsepower is a mechanical unit of measure equal to the force required to move 550 lb, ____ ft in ____ sec.

A

1;1

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12
Q

Energy from gears, belts, or pulleys is an example of _____ energy.

A

Mechanical

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13
Q

The ____ pressure gauge is the most commonly used fluid power pressure gauge in industry.

A

Bourdon tube

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14
Q

_____ pressure is the amount of pressure above the existing atmospheric pressure and is used to measure pressure inside a closed fluid power system.

A

Gauge

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15
Q

_____ is the useful amount of output energy from a fluid power system compared to the amount of input energy.

A

Fluid power system efficiency

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16
Q

______ pressure is equal to the sum of gauge pressure and atmospheric pressure.

A

Absolute

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17
Q

Pressure in a hydraulic system is the resistance to ______.

A

Fluid flow

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18
Q

A(n) _______ pressure gauge has a tube that becomes straighter as pressure is increased.

A

Bourdon tube

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19
Q

_____ is used in a hydraulic to allow fluid from the reservoir to travel into the pump.

A

Vacuum

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20
Q

Schrader pressure gauges take measurements that are accurate to about +/- ____%

A

10

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21
Q

Hydraulic pressure is created when fluid flow from a hydraulic pumps meets ______.

A

resistance

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22
Q

_____ pressure is created by the weight of the atmospheric at sea level under standard air condition

A

Atmospheric

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23
Q

Cylinders and motors in a fluid power system are considered _______.

A

actuators

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24
Q

_______ is the amount of weight in pounds that a fluid power system must produce to move an object.

A

Exerted force

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25
A(n) _______ pressure gauge converts fluid pressure into an electrical signal.
digital
26
______ must be overcome to perform work.
Resistance
27
______ is the number of unit squares equal to the surface of an object.
Area
28
Digital pressure gauges are accurate from +/- ___% to ___%.
0.1; 0.5
29
Fluid power system energy transmission is based on efficiency, power, and _____.
work
30
_____ is the force that stops, slows, or restricts the movement of fluid or devices in a fluid power system.
Resistance
31
____ is any pressure less than atmospheric pressure.
Vacuum
32
_____ is the capacity to do work.
Energy
33
A(n) ______ is used to measure atmospheric pressure using a column of mercury.
mercury barometer
34
_____ energy involves the addition of heat to make a particle or molecule move faster.
Thermal
35
____ states that when a force is applied to a confined fluid, the force is felt throughout the fluid undiminished.
Pascal’s Law
36
T or F: The amount of pressure required to move a cylinder with an attached load is the same for extension and retraction
False
37
T or F: Some pressure gauges take measurements and two scales.
True
38
T or F: In fluid power systems, distance is typically measured in meters (m), although feet (ft) is sometimes used for specific situations.
False
39
T or F: When pressure is above 14.7 psia, a vacuum is created
False
40
T or F: Sound energy is used in a fluid power system for troubleshooting purposes.
True
41
T or F: In a pneumatic system, air is considered to be a gas and not a fluid
False
42
T or F: Vacuum in a confined space is created when pressure is below 14.7 psia.
True
43
T or F: Pressure can be measured with a Schrader pressure gauge.
True
44
T or F: Thermal energy is created in an efficient fluid power system.
False
45
T or F: A Bourdon tube in its normal position is bent in the shape of the letter C.
True
46
T or F: In a fluid power system, wasted energy is converted into heat and pressure drops
True
47
T or F: Digital pressure gauges can operate on AC or DC power.
True
48
T or F: A liquid is noncompressible and can assume the shape of a combined space.
True
49
T or F: A circle with a diameter of 10 sq in. has an area of 100 sq in.
False
50
T or F: The strength of a vacuum depends on how far above 14.7 psia it is.
False
51
T or F: Absolute pressure can be used in systems that have vacuums to avoid using a negative number
True
52
T or F: A properly installed fluid power system is 100% efficient.
False
53
T or F: Force is the movement of an object (in lb) over a distance in ft).
False
54
T or F: All hydraulic cylinders have a piston with a rod attached to one side.
True
55
T or F: Bourdon tube pressure gauge housings are typically filled with oil to prevent damage to the tube, pointer, or linkage
True
56
T or F: A measurement on a vacuum gauge that reads of 3.0 inches of mercury (in Hg) is also equal to 29.92 psi.
False
57
T or F: Total energy in a fluid power system has the ability to change back and forth between static energy and kinetic energy as many times as necessary.
True
58
T or F: The piston is the surface that makes contact with the pressure in a cylinder.
True
59
T or F: It is impossible to have a fluid power system that is 100% efficient.
True
60
T or F: Energy can easily be created or destroyed.
False
61
How much horsepower is required for the boom of a hydraulic grapple crane to lift a steel billet that weighs 1200 lb a distance of 12 ft into a gondola car in 6 sec?
[ 1200 x (12/6) ] / 550 =4.36 HP
62
What is the surface area of the cap end of a piston with a diameter of 8”?
0.7854 x 8^2 =50.27 sq in
63
What is the surface area of the cap end of a piston with a diameter of 6”?
0.7854 x 6^2 =28.27 sq in
64
List four variables that affect pressure inside a fluid power system:
1. Friction from fluid flow through pipes and hoses 2. Differences in diameter of pipes and hoses 3. Fluid flow through system devices (meters, gauges, etc.) 4. Fluid viscosity
65
How much pressure is created when a 22,000 lb load is applied to a 3” diameter cylinder?
P= F/A A= 0.7854 x 3^2 = 7.068 = 7.07 sq in P= 22,000/7.07 = 3,111.7 = 3,112 psi
IMT-131
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