Principles of Steam Engineering

Question 1

the term energy is defined as?

Answer 1

the capacity for producing effect

Question 2

what is the definition of mechanical energy?

Answer 2

energy associated with large bodies or objects

Question 3

what is the definition of thermal energy?

Answer 3

energy associated with very small particles called molecules

Question 4

what is the definition of chemical energy?

Answer 4

energy that arises from the forces that bind the atoms together in a molecule

Question 5

what is potential energy?

Answer 5

energy at rest; stored energy

Question 6

kinetic energy is defined as?

Answer 6

energy in motion, producing work

Question 7

combustion is an example of what type of energy?

Answer 7

chemical energy

Question 8

thermal energy in transition is termed?

Answer 8

work

Question 9

what are the two forms of mechanical energy?

Answer 9

mechanical potential and mechanical kinetic energy

Question 10

what is mechanical potential energy measured in?

Answer 10

foot-pounds

Question 11

what is the potential energy of an object that weighs 5 pounds and is held 20 feet off earth?

Answer 11

100 foot-pounds

Question 12

potential energy equals what?

Answer 12

work times distance ( W X D) = PE

Question 13

force times distance (F X D) equals?

Answer 13

Work

Question 14

what is the definition of power?

Answer 14

the rate at which work is done

Question 15

power is measured in what common unit?

Answer 15

horsepower

Question 16

one horsepower is equivalent to what?

Answer 16

33,000 foot pounds of work per minute or 350 foot pounds of work per second

Question 17

A 3 horsepower engine generates how many foot pounds per second?

Answer 17

1650

Question 18

what is the horsepower generated, if an engine is producing 5, 500 foot pounds of work per second?

Answer 18

10 horsepower

Question 19

what are two forms of stored thermal energy?

Answer 19

internal potential energy and internal kinetic energy

Question 20

what unit is heat measured in?

Answer 20

British thermal unit (BTU)

Question 21

what is defined as the quantity of heat required to raise the temperature of 1 pound of water through 1 degree on the Fahrenheit scale?

Answer 21

1 British thermal unit (BTU)

Question 22

how many calories equal 1 BTU?

Answer 22

approximately 252

Question 23

what is defined as the quantity of heat required to raise the temperature of 1 gram of water through 1 degree on the Celsius scale?

Answer 23

calorie (cal)

Question 24

what are the three types of heat transfer?

Answer 24

conduction; radiation; convention

Question 25

what is the mode of heat transfer by which heat flows form a hotter to a colder substance when there is physical contact between the two substances?

Answer 25

conduction

Question 26

what is the mode of heat transfer that does not require any physical contact between the warmer substance and the cooler substance?

Answer 26

radiation

Question 27

what type of heat transfer is generated by the sun as it heats the earth without heating space?

Answer 27

radiation

Question 28

what is the mode of heat transfer that occurs by transmission of heat by the circulation of a liquid or a gas such as air?

Answer 28

convection

Question 29

what are the three basic physical states of all matter?

Answer 29

solid, liquid and gases

Question 30

what are the two effects that the flow of heat has on a substance?

Answer 30

sensible and latent

Question 31

sensible heat is defined as?

Answer 31

when the flow of heat is reflected in temperature change and not in a change in physical state

Question 32

latent heat is defined as?

Answer 32

when the flow of heat is not reflected in a temperature change but is reflected in the changing physical state of a substance

Question 33

to change a pound of ice at 32 degrees F. to a pound of water at 32 degrees F., we must add how many BTU?

Answer 33

144

Question 34

what is the term associated with a substance that changes from a gas or vapor to a liquid?

Answer 34

latent heat of condensation

Question 35

what is the definition of specific heat?

Answer 35

a thermal property of matter that must be determined experimentally for each substance

Question 36

how is the principle of the conversation of energy most simply stated?

Answer 36

energy in = energy out

Question 37

what is the formula for converting heat to work?

Answer 37

1 BTU = 778 foot-pounds

Question 38

thermal energy of main steam is transformed to mechanical energy at what point in the basic steam cycle?

Answer 38

high and low pressure turbines

Question 39

fuel oil used in the boiler is considered what type of energy?

Answer 39

chemical

Question 40

when a vapor is in contact with the liquid from which it was generated, it remains the same temperature as the boiling liquid. in this condition the liquid and the vapor are said to be in?

Answer 40

equilibrium contact

Question 41

the temperature at which a liquid boils under pressure is called the saturation temperature, and the corresponding pressure is called what?

Answer 41

saturation pressure

Question 42

atmospheric pressure is expressed as?

Answer 42

14 psi at sea level and lesser at higher altitudes

Question 43

what term is used when the water and steam reach a point that they are no longer indistinguishable from each other, and no further changes in state can occur with the addition of heat or pressure?

Answer 43

critical point

Question 44

steam which has been heated above its saturation temperature for any give pressure is called what?

Answer 44

superheated steam

Question 45

the amount by which the temperature of the superheated steam exceeds the temperature of the saturated steam at the same pressure is know as what?

Answer 45

degree of superheat

Question 46

if saturated steam at a pressure of 1200 psig and the corresponding saturation temperature of 567 degrees F. is superheated to 900 degrees F., what is the degree of superheat?

Answer 46

333 degrees F

Question 47

what is the saturation pressure for water at a saturation temperature of 212 degrees F.?

Answer 47

14.7 psi

Question 48

the changing of steam to condensate in the main condenser is an example of what heat effect?

Answer 48

latent heat of condensation

Question 49

the circulation in a natural circulation boiler is an example of what heat effect?

Answer 49

natural convection

Question 50

when the main feed pump discharges feed water toward the boiler, the feed water is transported by what kind of heat transfer?

Answer 50

forced convention