Other Engineering Answers

Prepare a cell containing copper sulphate solution and two copper plates. Determine its internal resistance with the help of a potentiometer.
New repeat the experiment by changing the concentration of the solution. For this remove about 50 ml CuSo4 solution and add similar amount of water in the cell. For the purpose of measurement you can use a doctor’s syringe. Do you find any change in the internal resistance of the cell?
Also change the (i) plate area immersed in the electrolyte and (ii) separation between the plates. Write various factors on which internal resistance of a cell depends.

a) explain what is meant by the term phased evacuation
b) why may it be advantageous to design building on the basis of phased evacuation
c) what criteria should be satisfied in a building that is designed on the basis of phased evacuation

1. Describe and discuss, in detail the special provisions that need to be made with respect to means of escape and evacuation in a hospital. Explain why such provisions are necessary

1. Stairsways that are provided for means of escape are usually enclosed within fire resisting construction. There may be occasions when additional protection is also required for stairways
i) what additional protective measures are available and give five examples of when such additional protection would be required
2. with particular emphasis on premises which provide sleeping accomadition
i) when escape can be made in one direction only, describe the various solutions that may be adopted and explain the reasoning behind them
ii) ideally stairway enclosures should lead directly to a final exit. Describe the arrangements that are recommended if stairways do not lead directly to final exits

1. Describe with aid of diagrams the methods and measures that need to be taken to protect exposed structural steelwork. Outline the various materials that may be used and the advantages and disadvantages they offer
2. Compare and contrast fire related aspects of building design material and methods of construction that you may consider if asked to plan
i) a school
ii) a high bay warehouse
3. Describe the fire problems associated with cavities and voids in building construction. What are the differences between a cavity barrier, a fire damper and a fire stopping? Illustrate your answer with diagrams and indicate where these features should be positioned in a building

1. What is meant by the term compartmentation? Descibe the various reasons that it may be incorporated into a building and the effects it will have on a fire in that building.
2. List SIX materials which may be used for load bearing colums in buildings and summarise their fire ratelated properties.
3. Describe with reference to relevat local or national standard the method of testing these structural elements
4. Door self closing devices may be used for actuating the closure of fire resisting doors. Descibe with the aid of sketches the various door closing mechanism and automatic hold open devices that can be used indicating their advantages and disadvantages

1.Water spray system are often installed to protect special risk at industrial premises. Explain the three main methods by which water spray extinguishes fire

2. Outline major application system which are used to apply the spray

3. What additional extinguishing factor would be present when a high velocity spray was applied to fire

1. You are asked to give advice on reduction of false alarm in a large open plan process area in a factory (large machinery 10m high running along whole length of area). On investigation you find many false alarms occur at the end of every shift, when process generates dust and steam during equipment cleaning.
i) what type of fire detection will be presenting these problems. What is its probable purpose and why was it chosen?
ii) suggest three measures that might be taken only in respect of fire detection system to reduce false alarms
iii) for each measure discuss disadvantage that may be associated with the measure and any consequent qualification, limitation with special reference to Filtering measure in BS 5839-1
iv) what alternative approach not using convectional fire detectors but still forming part of the detection system might suit this building. See commentary of detection in BS 5839-1

a) Local authority has experienced number of deaths in older, two storey local authority dwelling in which battery operated smoke alarms had been installed by the local authority, as landlord. On inspection it is found that in most cases batteries had been removed from the smoke alarms.
i) Comment on reasons as to why batteries might have been removed
ii) what advice would you offer local authority in terms of the future policy on provision of smoke alarms with reference to BS 5839-6. What grade/category is currently installed? Outline minimum grade/category shown in Table 1 for older properties. possibility no longer in good condition. As this part (a) is 60% of marks a formal mini report of around 250 words is envisage for a full answer.