Exam paper for second semester: Energy Technolog

Ledger, John, Dr.

Van Niekerk, W., Mr.

Name not available

Energy Technology

  
 
 
FACULTY OF SCIENCE 
 
 
 
DEPARTMENT OF GEOGRAPHY, ENVIRONMENTAL MANAGEMENT & ENERGY STUDIES 
 
  
 MODULE ENS0047 
   ENERGY TECHNOLOGY 
    
 
 CAMPUS APK 
  
 EXAM  NOVEMBER 2015 
  
 
 
DATE 5 NOVEMBER 2015    SESSION 12:30 – 15:30 
 
 
ASSESSOR(S)      DR JOHN LEDGER 
 
 
EXTERNAL MODERATOR    MR W VAN NIEKERK 
       (UNIVERSITY OF NORTH WEST) 
 
 
DURATION 3 HOURS    MARKS   100 
__________________________________________________________________________ 
 
NUMBER OF PAGES:  2 PAGES 
 
 
INSTRUCTIONS:  
 
Please answer Question 1 (compulsory) and any TWO of the following FOUR 
questions. Question 1 comprises ten short questions that can be answered in 
one paragraph each. The other two answers should be in the form of a 
comprehensive essay, with sketches and diagrams where these may be 
appropriate to enhance your answer. Alternatively you may provide your 
answer in point form. Each answer is worth the same number of marks (33.3%) 
 
 
 
 
 
 
 
 
      
 
 
 
 2 
QUESTION 1 (COMPULSORY) 
 
1. Short questions 
 
a). Draw and label a sketch of a pumped storage electricity facility such as 
Drakensberg or Ngula. 
 
b). Describe the progress made in recent years with energy efficient lighting at 
household and commercial level. 
 
c). At what frequency does the South African electricity grid operate, and how is this 
kept on target? 
 
d). Name two liquid biofuels and the plants you might use to make them. 
 
e). Which plants should not be used in South Africa’s proposed biofuel production, 
and why not? 
 
f). Name and briefly describe the activities at South Africa’s nuclear facilities at 
Pelindaba. 
 
g). Describe three energy technologies that use natural gas from Mozambique. 
 
h). Wind turbines may have negative environmental impacts. Name some of them.  
 
i). Two different kinds of ash have to be dealt with at Lethabo Power Station. What 
are they, and how are they handled? 
 
j). Two different forms of water are used in coal-fired power stations like Lethabo. 
Explain 
          [33.3] 
 
QUESTION 2 
 
2. Electricity Generation from the Sun. A number of solar plants have 
recently been connected to the South African national grid. Describe the 
energy technologies that can be used to generate electricity from the solar 
energy of the Sun.  
          [33.3] 
 
QUESTION 3 
 
3. Hybrid and Electric Vehicles. Most car makers have hybrid and/or electric 
vehicles in production or under development. Describe the failed efforts to 
introduce electric cars in California in the 1990s, the renewed interest in 
the technology, recent advances in battery technology, and the potential 
benefits and disadvantages of electric and hybrid vehicles.  
          [33.3] 
    
 3 
QUESTION 4 
 
4. Domestic Solar Water Heating Technology. Describe domestic solar water 
heating technology, how these appliances work, how the challenge of 
damage by freezing can be addressed, and some of the different designs 
that are available on the market.  
 
          [33.3] 
 
 
QUESTION 5 
 
5. Bioenergy. Write an essay on the technologies and basics of the chemical 
and thermodynamic processes of gasification, pyrolysis, torrefaction, 
carbonization, electricity generation, combined heat and power (CHP)  
 
        [33.3] 
 
 
        TOTAL [100] 
 
 
 


  
 
 
FACULTY OF SCIENCE 
 
 
 
DEPARTMENT OF GEOGRAPHY, ENVIRONMENTAL MANAGEMENT & ENERGY STUDIES 
 
  
 MODULE ENS0047 
   ENERGY TECHNOLOGY 
    
 
 CAMPUS APK 
  
 EXAM  NOVEMBER 2014 
  
 
 
DATE 12 NOVEMBER 2014    SESSION 12:30 – 15:30 
 
 
ASSESSOR(S)      DR JOHN LEDGER 
 
 
EXTERNAL MODERATOR    MR W VAN NIEKERK 
       (UNIVERSITY OF NORTH WEST) 
 
 
DURATION 3 HOURS    MARKS   100 
__________________________________________________________________________ 
 
NUMBER OF PAGES:  2 PAGES 
 
 
INSTRUCTIONS:  
 
Please answer Question 1 (compulsory) and any TWO of the following FOUR 
questions. Question 1 comprises ten short questions that can be answered in 
one paragraph each. The other two answers should be in the form of a 
comprehensive essay, with sketches and diagrams where these may be 
appropriate to enhance your answer. Alternatively you may provide your 
answer in point form. Each answer is worth the same number of marks (33.3%) 
 
 
      
 
 
 
 
 
 
 
 
 QUESTION 1 (COMPULSORY) 
 
1. Short questions 
 
a). How is fly ash extracted from the flue gas at Lethabo Power Station? 
 
b). Two different forms of water are used in coal-fired power stations like Lethabo. 
Explain. 
 
c). At what frequency does the South African electricity grid operate, and how is this 
kept on target? 
 
d). Name two liquid biofuels and the plants you might use to make them. 
 
e). Which plants should not be used in South Africa’s proposed biofuel production, 
and why not? 
 
f). Name and briefly describe the only nuclear power station in Africa. 
 
g). Draw and label a sketch of a pumped storage electricity facility. 
 
h). Two groups of wild creatures may be adversely affected by wind turbines.  
Explain briefly. 
 
i). Briefly describe three energy technologies that use natural gas from Mozambique. 
 
j). Describe the progress made in recent years with energy efficient lighting. 
 
          [33.3] 
 
 
QUESTION 2 
 
2. Electricity Generation from the Sun. Describe the various energy technologies 
that can be used to generate electricity from the solar energy of the Sun.  
           
[33.3] 
 
 
QUESTION 3 
 
3. Hybrid and Electric Vehicles. Most car makers have hybrid and/or electric 
vehicles in production or under development. Describe the failed efforts to 
introduce electric cars in California in the 1990s, the renewed interest in the 
technology, recent advances in battery technology, and the potential benefits and 
disadvantages of electric and hybrid vehicles.  
           
[33.3] 
    
 
 
 
 
 
 
 QUESTION 4 
 
4. Solar Water Heating Technology. Describe solar water heating technology, how 
these appliances work, how the challenge of damage by freezing can be 
addressed, and some of the different designs that are available on the market.  
 
          [33.3] 
 
 
QUESTION 5 
 
5. Reducing domestic electricity consumption in South Africa. Describe the different 
technologies that home owners can implement to reduce their domestic 
consumption of electricity. 
 
        [33.3] 
 
 
SUB-TOTAL [33.3] 
 
        TOTAL [100] 
 
 
 


Energy Technology

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