Download Engineering Science Examination for Bachelor of Engineering in Civil Engineering and more Exams Engineering Science and Technology in PDF only on Docsity!
CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 2012/
Module Title: Engineering Science
Module Code: CIVL 6009
School: Building & Civil Engineering
Programme Title: Bachelor of Engineering in Civil Engineering
Programme Code: CCIVL_7_Y
External Examiner(s): Mr Brian Byrne, Mr Adrian Cunningham
Internal Examiner(s): Ms Mary Quirke
Instructions: Question 1 is compulsory, all candidates must attempt question 1 (40%). Answer TWO other questions each worth 30%.
Duration: 2 hours
Sitting: Winter 2012
Requirements for this examination: Log tables are to be made available to students
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you are attempting the correct examination. If in doubt please contact an Invigilator.
Please answer question one - it is compulsory.
1 (a) Explain three advantages of maximising the natural sunlight in a building through windows, skylights and light tubes? Describe four design considerations that are needed to maximise daylighting? ( 7 marks)
(b) From the electronic configuration of Sodium (Na^11 ) and Chlorine (Cl^17 ). (i) What type of interatomic bonding would you expect to exist in the NaCl molecule? (ii) How many valence electrons does each element have in their normal state? (iii) Briefly describe the type of bonding present in NaCl. (6 marks)
(c)
(d)
(i) Define specific heat capacity and latent heat. (ii) How much heat is needed to convert 8 kg of ice at 0°C to 8 kg of water at 80°C? Latent heat of fusion of ice = 336 kJ/kg Specific heat capacity of water = 4180 J/kg/K
Draw a typical stress-strain curve for mild steel. On the graph for mild steel indicate, (i) The region of plastic deformation (ii) The region of elastic deformation (iii)The yield strength (iv) The ultimate tensile strength
(5 marks)
(8 marks)
(10 marks)
(e) A dB meter placed in front of a pneumatic drill reads 82 dB. What is the intensity of the corresponding sound? (4 marks)
3 (a) What are the 2 main differences between primary and secondary bonds? (6 marks) (b) What are the four main classes of engineering materials? Give an example of a construction material from each class of engineering material. Suggest three advantages and one limitation of each of these materials? (^) (16 marks) (c) Thermoplastic polymers are typically crosslinked with secondary bonds. (i) Explain the terms thermoplastic and crosslinking. (ii) Suggest a construction material that is thermoplastic.
(6 marks)
(2 marks)
4 (a) (i) Identify two types of artificial light and describe how they produce artificial light. (ii) Compare these 2 artificial lights from part 4(a)under the following headings: efficacy, colour rendering index, lifetime, colour temperature and application.
(4 marks)
(5 marks)
(b) Describe the differences between airborne sound and impact sound. (5 marks) (c) (^) Describe, in detail, the 4 main processes that occur when sound waves are incident or strike a surface. (6 marks)
Question 4 is continued on the next page
(d) Using Sabin’s formula, calculate the actual reverberation time at 500 Hz, in a hall with the following surface finishes, areas, absorption coefficients and seating conditions: Item Area Absorption Coefficient at 500 Hz Brick walls 850 m^2 0. Plaster on solid backing
540 m^2 0.
Glass windows 80 m^2 0. Curtain 90 m^2 0. Acoustic board 130 m^2 0. Wood block floor 300 m^2 0.
In addition there are 550 occupied seats each contributing 0. m^2 units of absorption. The volume of the hall is 3,800 m^3.
(10 marks)
Useful Formulae: SIL = 0
( ) 10 log 10 1 I L dB I I Io = 1 x10-12^ W/m^2 and P (^) o = 2 x 10-5^ N/m^2 SPL = 0
( ) 20 log 10 1 P L dB P p
Sabin’s formula: RT^ 60 ^0.^16 S V
