Technician A says that the low level brake fluid switch on a master cylinder will turn on the brake warning light when the system is low on fluid. Technician B says that the low level switch also monitors the condition of the fluid and will activate the warning light when the brake fluid needs to be replaced. Who is correct?

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.