## Calculate the vapour pressure of Zn over a Cu-Zn binary solution of N, = 0.3 at 1,280K.

1.The activity coefficient of zinc in liquid zinc-copper alloys in the temperature range 1,070 – 1,300K can be expressed as follows : RTlny, = -31,6OON& where R = 8.3 14 J moT’K-‘. Calculate the vapour pressure of Zn over a Cu-Zn binary solution of N, = 0.3 at 1,280K. The vapour pressure of pure liquid zinc is given by l0gP = – 4J620 – 2.26iogT+ 12.34 (ton)

2. A container having three compartments contains 1 mole of gas A, 2 moles of gas B and 3 moles of gas C, respectively, at the same temperature and pressure (298K and 1 am). The partitions are lifted and the gases are allowed to mix. Calculate the change in the Gibbs free energy G’? Assume the gases behave ideally.

### Calculate the maximum achievable bridge out-of-balance voltage for an applied torque T of 103 N m given the following

Four strain gauges, with specification given below, are available to measure the torque on a cylindrical shaft 4 cm in diameter connecting a motor and load. (a) Draw clearly labelled….

### Find the gain and phase characteristics of the maintaining amplifier.

A solid-state capacitive humidity sensor has a capacitance given by: C = 1.7 RH + 365pF where RH is the percentage relative humidity. The sensor has an associated parallel resistance….

### calculate the mean velocity of the gas at maximum flow rate

A pitot tube is used to measure the mean velocity of high pressure gas in a 0.15 m diameter pipe. At maximum flow rate the mean pitot differential pressure is….