RER

1.

1 point

Pellet specific volume LHV is 3x less than for heating oil, larger storage space is required for same energy content

True

False

2.

1 point

The heat storage capacity depends on

Collector area,total load,planned solar fraction% of delivered energy total

Collector area,water quality

Temperature, heat capacity

Total load, volume

3.

1 point

Energy service based on moving heat from available heat sources to immediate use directly by customers

Waste incineration

District heating

Cogeneration

Industrial processes

4.

1 point

CO2 emissions depend directly on

The carbon content of the fuel

Hydrogen

Oxygen

Temperature

5.

2 points

Which of the following are drawbacks for biodiesel

Can cause damage to some engine parts

Forming of sediments, leading to filter clogging

Presence of sulfur

Bad lubricating properties

6.

1 point

District Heating supply water ranges from______ and the return water between _______ depending on the system and weather conditions

60 to 120ºC -- 30 – 70ºC

50 to 110ºC -- 30 – 60ºC

90 to 120ºC -- 40 – 70ºC

60 to 100ºC -- 30 – 90ºC

7.

1 point

The load is indicated in power units

True

False

8.

1 point

Pellet production is less labor-intensive than the processing of other fossil fuels

True

False

9.

1 point

Which of the following countries has the highest bioethanol production

Canada

United States

Brazil

China

10.

1 point

Demand is expressed in energy units, it indicates the integrated consumption over a period of time

True

False

11.

1 point

The combustion properties of wood, in particular the heating value, depend mostly on

Oxygen

Density

Temperature

Moisture content

12.

1 point

District energy (heating, cooling) typically has low capital expenditures (CAPEX) and relatively high operating expenditures (OPEX)

True

False

13.

2 points

Which of the following are drawbacks for ethanol as a fuel

Small fuel consumption (liter/km)

High heating value than gasoline

Lower heating value than gasoline

Corrosive behavior

14.

1 point

Which of the following is not a solar thermal collector

Evacuated-tube collector

Flat-plate solar thermal collector

Grill solar collector

Vacuum-tube collector

15.

2 points

Which of the following are necessary to the production from glucose(sugar stock) to ethanol

Storing

Distillation

Fermentation

Refining

16.

1 point

What is the meaning of EROI

Energy revised on invested

Energy return on invested

Eastman Rochester Organ Initiative

Energy return on increase

17.

2 points

Why the maximum water speed in district heating pipes is
limited

Reduction of the risk of erosion

Noise reduction

Pressure

Temperature

18.

1 point

Alcohol is a byproduct of fermentation of sugars and starches

True

False

19.

1 point

The process of starch to ethanol has high processing cost although its easy to be stored

True

False

20.

1 point

The ________ is the most important(independent) variable needed to explain both the daily magnitude of heat demand and yearly
variations in total space heat demand

Heat

Outdoor temperature

Ventilation air

Indoor temperature

21.

1 point

Oxygen in biodiesel provides for more complete combustion and a reduction in most emissions

True

False

22.

1 point

In order to have alcohol combustion, it is essential to break....and....

C-O,O-H

C-H, O=O

H-O2,C-O2

C-C, H-H

23.

1 point

70% of biofule cost is due to feedstock

true

false

24.

1 point

Which one is not an influence factor of photosynthesis?

Light intensity

available amount of CO2

High tempreture

High solar radiation

25.

1 point

Biomass rich in cellulose and lignin is used for

Oil

Sugar

Manure

Combustion

26.

1 point

Which of the following is not necessary for the pre-processing for producing starch to ethanol

Dehydration

Water mixing

Milling

Addition of enzymes

27.

1 point

The best indicator for the carbon content is the _________ because it refers only to the heat produced by carbon atoms during CO2 generation

Higher heating value

Fuel

Oxygen

Lower heating value

28.

1 point

The availability of solar radiation to solar thermal collectors is estimated with the same tools as for PV generators

True

False

29.

1 point

___________ consists of densely planted, high-yield varieties of willow and poplar

Oil palms

Pellets

Grass

Short Rotation Coppice

30.

1 point

E10 is 10% gasoline blended with 90% ethanol

True

False

31.

1 point

All biodiesel, regardless of its feedstock, has about the same heating value

True

False

32.

1 point

What is the SI unit for bound energy?

J/Kg

Kj/Kg

Kj/mol

j/mol

33.

1 point

Which of the following is not true

Pellets are produced from sawdust and forestry residues

Pellets are produce by crushing and pressing

Pellets are typically 1-2 cm long

Ash quantity from pellet combustion is usually higher than for coal

34.

1 point

Fuel blends are indicated by E (ethanol) or M (methanol) with a number representing the blend percentage of _______ (by volume)

Oil

Gasoline

Alcohol

Octane

35.

1 point

which of the following is not a fuel type?

Enthan

Octan

Pantane

Hexan

36.

1 point

In general, feedstock rich in sugar is converted in

Bioethanol

Starch

Oil

Biodiesel

37.

1 point

Types of heat storage for solar district heating

Collector(CTES),Pit storage(PTES),borehole(BTES),acquifers(ATES)

Tank(TTES),Pit storage(PTES),borehole(BTES),acquifers(ATES)

Tank(TTES),collector(CTES),borehole(BTES),acquifers(ATES)

Tank(TTES),Pit storage(PTES),collector(CTES),acquifers(ATES)

38.

1 point

Due to the large presence of oxygen atoms, cellulose has a lower heating value than fossil fuels

True

False

39.

1 point

The water speed in the pipelines of district heating is usually below

8 m/s

2 m/s

10 m/s

4 m/s

40.

1 point

The nominal pressure levels in district heating are typically

14-23 bar

16-25 bar

19-29 bar

18-30 bar

41.

1 point

Sugar crops must be processed a long time after harvesting therefore,
storage of sugar crops is practical

True

False

42.

1 point

The energy demand with solar thermal for tap hot water (no heating) is ≈_____ at a fluid temperature of 35–40ºC

4.5–5 kWh/person

1.5–2 kWh/person

3.5–4 kWh/person

2.5–3 kWh/person

43.

1 point

District heating has a high capital investment for customer heating
equipment

True

False

44.

1 point

The atomic weight of water is

18

10

16

2

45.

1 point

Which of the following is not a property of ethanol as a car fuel

Anticorrosive behavior

Minor environmentally-dangerous emissions compared to gasoline.

The risk for overheating is reduced and engine life is extended

High “octane”-like rating

46.

1 point

Which of the following is not a control strategy in district heating

PID control

Feedforward control

Feedback control

Set-point scheduling control

47.

1 point

For the production of biodiesel is not required

Alcohol

Vegetable oil

Methanol

Sulfuric acid

48.

1 point

Which of the following is not an attribute of district heating

Inflexible

Economy of size

Security of supply

Flexibility

49.

1 point

The quantity of heat released by a certain mass of fuel after its complete combustion is

Energy

Heating value

Oxidation

Combustion

50.

1 point

How much of feed sugar can be converted into ethanol in practice?

50%

20 to 25%

more than 50%

below 20%