Chapter 6 - Geothermal

Question 1

Refers to the internal heat from the earth

Answer 1

Geothermal

Question 2

A rock-forming crystalline mixed silicate which constitute about 60% of the earth’s earthquake

Answer 2

Feldspar

Question 3

A compound rock, a crypto - crystalline form of silica which is dens, tough, breaking with a conchoidal fracture

Answer 3

Flint

Question 4

The process of using injection wells to bubble air through groundwater

Answer 4

Sparging

Question 5

A popular term used by utilities to mean upgrading existing plant

Answer 5

Repowering

Question 6

A dense, fine grained, light colored igneous rock which is rich in silica

Answer 6

Felsite

Question 7

An opening in lava or in volcanic area through which steam and other hot gases are escaping into the air is called:

Answer 7

Fumarole

Question 8

Tidal power is the power generated from:

Answer 8

rise and fall tides

Question 9

Converts chemical energy directly into electrical energy

Answer 9

Fuel cell

Question 10

Generates a voltage from incident light, usually light in the visible region

Answer 10

Photovoltaic Cell and Solar Cell

Question 11

All of the following terms are synonymous with quanta of electromagnetic theory except

Answer 11

X-rays

Question 12

In geothermal power plants waste water is:

Answer 12

Discharged back to earth

Question 13

In a liquid-dominated geothermal plant, what process occurs when the saturated steam passes through the turbine

Answer 13

Polytropic

Question 14

What do you call a conversion technology that yields electricity straight from sunlight without the aid of a workinv substance like gas or steam without the use of any mechanical cycle?

Answer 14

Photovoltaic-energy conversion

Question 15

Tidal power plant is attractive because it has:

Answer 15

Cheap energy source

Question 16

The statement that the product of the error in the measured determination of a particle’s position and its momentum is of the order of Planck’ constant h is known as:

Answer 16

The Heisenberg uncertainty principle

Question 17

The flow process through shock wave is highly irreversible and cannot be approximated as being:

Answer 17

Isentropic

Question 18

Beaufort scale is used for measuring?

Answer 18

Wind speed

Question 19

Betz law is widely used in?

Answer 19

wind mills

Question 20

Rocks having excessive internal stresses may produces spalling. This rocks are called _____

Answer 20

stratified rocks

Question 21

Solar energy arrives at the outside of the earth’s atmosphere at an average rate of _____

Answer 21

1.354 kW/m²

Question 22

How many percent of solar energy survives absorption and reflection?

Answer 22

40 to 70%

Question 23

Solar energy is capturesld in:

Answer 23

Solar collector

Question 24

Which of the following solar collectors are essentially wide, flat boxes with clear plastic or glass coverings known as glazing?

Answer 24

Flat plate collectors

Question 25

Which of the following collectors use mirrors and lenses to focus the suns energy on a small absorber area?

Answer 25

Concentrating collectors

Question 26

Which of the following collectors are more complex, but their efficiencies are higher?

Answer 26

Evacuated Tube collectors

Question 27

Useful when extremely hot transfer fluid is needed and are generally limited to commercial projects

Answer 27

Evacuated tube collectors

Question 28

The shading factor in calculating the heat absorbed by the solar collector has a value of approximately:

Answer 28

0.95 to 0.97

Question 29

Ratio of energy absorbed by the transfer fluid to the original incident energy striking the collector

Answer 29

Collector efficiency

Question 30

The difference between the ambient air and inlet temperature increases, what happens to the collector efficiency?

Answer 30

Decreases

Question 31

Distributee collector is also known as:

Answer 31

trough electric system

Question 32

Central receiver system is also known as:

Answer 32

Power tower system

Question 33

Which of the following main approaches to solar energy generating systems describes that parabolic tracking trough concentrators focus sunlight on evacuated glass tubes that run along the collector focal lines?

Answer 33

Trough electric system

Question 34

Trough electric technology due low temp. average annual thermal efficiencies are only:

Answer 34

10-15%

Question 35

A field of heliostats or travking mirrors concentrares solar energy to a receiver on a central tower

Answer 35

Power tower system

Question 36

Power tower system typical thermal efficiencies :

Answer 36

15 - 20%

Question 37

Dish engine system efficiency

Answer 37

24 - 28%

Question 38

Practical and economic issues limit trough electric systems about:

Answer 38

200 MW

Question 39

Practical and economic issues limit TOWER electric systems to approximately:

Answer 39

100 - 300 MW

Question 40

Thermal efficiency of a geothermal power plant

Answer 40

22%

Question 41

Flash steam cycle can be used if the hot water temperature is:

Answer 41

165 °C or higher

Question 42

A binary cycle using a separate heat transfer a fluid if the temperature of the hot water is between ________

Answer 42

165 °C and 120 °C

Question 43

For every kilometer of depth the temperature of the earth’s crust increase by

Answer 43

30 F

Question 44

Multiple wells produce steam at 690 to 830 kPa and temp. of ______

Answer 44

205 °C

Question 45

In hot rock systems, water is injected through injection wells into artificially made fractured rock beds of how many kilometers below the surface?

Answer 45

1 to 6 km