$($a$)$ Write brief notes on the impact of sound on occupant comfort in buildings.

$($b$)$ Write brief notes on Rainwater Harvesting for Domestic water use. Particular reference is to be made to system sizing and water quality issues.,

$(3+3+2$ marks$)$

$($c$)$ Comment on the possible effects of installing a wrongly sized air conditioner and then calculate the cooling capacity needed for a Call Centre Operations Room measuring $60$ feet by $80$ feet by $10$ feet that is being configured to accommodate $94$ clerks. $)=(3,415Bt\frac{u}{h}r.$

$(4+4$ marks$)$

$($d$)$ With the aid of a diagram, explain the purpose of the counterweight in an Electric Lift and then calculate the power in $kW$ required for an elevator electric motor when the speed of the car is $1\mathrm{.}5\frac{m}{s},$ motor efficiency is $70\%,$ the mass of car plus load is $1500kg,$ counterweight mass is $50\%$ and friction is $20\%.$

$(2+2+5$ marks$)$