7 (5 points) Buildings more than ___ meter high must have an automatic sprinkler system throughout the building. Question 7 options: A) 25 B) 30 C) 35 D) 20 Question 8 (5 points) Which sprinkler systems replace water in the sprinkler piping with air under pressure? Question 8 options: A) Preaction systems B) Residential systems C) Deluge systems D) Dry-pipe systems Question 9 (5 points) Which of the following method of smoke control is not acceptable? Question 9 options: A) Through a fan/ductwork system B) Through openable windows C) Through a non fire-isolated stair D) Through an air conditioning system Question 10 (4 points) Pressurized fire staircases can generate a negative pressure which prevents the smoke coming into the stair. Question 10 options: True False Question 11 (3 points) Residual Current Device (RCD) is used to protect human lives from electrical shocks. Question 11 options: True False Question 12 (3 points) Which fire extinguisher is suitable for combustible metals Question 12 options: A) Water B) Dry powder C) Wet chemicals D) Foam Question 13 (10 points) A 12 volt car battery is connected to a headlight of 6 ohms resistance. What is the heat loss of the headlight. Question 13 options: 72 watts 20 watts 12 watts 24 watts Question 14 (8 points) Calculate the boiler power required to heat a 120 litre hot water cylinder in 1.5 hours. The hot water temperature