Section A (answer at least ONE question from this section) Q1.(a) Briefly describe how a fire develops in a compartment and relevant fire engineering systems respond at different stages of fire development. ( 6 marks) (b) Briefly explain how a typical sprinkler system responds to fire and how the RTI of a sprinkler head can be measured. (10 marks) (c) A fire that occurs in a compartment generates a steady-state smoke layer, which is of a constant temperature of 120C and a velocity of 1m/s (ambient temperature is 20C ). A sprinkler head is installed at the ceiling, and its location is 3m away from the centre of the fire, measured horizontally. The activation temperature of this sprinkler head is 68C, and the RTI is 90m1/2s1/2. Estimate how long will the sprinkler head be activated after the fire starts. Explain what will be the difference if the smoke layer temperature and velocity both increase after the ignition (before the steady state). (9 marks) Information related to this question (variables are identically defined as in the lectures) RTI=u =ln(1TgTg)t