Mechanical Pumps for drug injection are first order actuation systems. The Pump delivers insulin or glucagon into the human body. It has first order system dynamics and its transfer function is given as follows: ()= 1 () +2
Where:
() - is the amount of drug injected into the human body by the pump
() - is the amount of drug required to be delivered by the pump What is the time constant of the pump?

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.

What is creep? what is stress relaxation?

Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference