Agas with a specific heat of y and gas constant of r in a large tank of volume v is discharged through a convergent nozzle of exit area ae. at time = 0, the gas in the tank has an initial pressure pi and an initial temperature ti. assuming the flow through the nozzle is steady, one-dimensional and isentropic with critical conditions at the exit, find the time required to "blow down" the tank isentropically from the initial pressure pi to the final pressure pf.

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k

Inadequate stores control is not an obstacle to effective work order system. (clo4) a)-true b)-false

Select any two (2) areas of applications of chain-drive. (clo4) a)-permanent lubrication necessary b)-hydraulic forklift truck operation c)-rigging and heavy moving materials d)-relatively high maintenance costs e)-costlier than belt drives