## What is the rate of mass loss per unit length of the cylinder?

A.     Dry air at atmospheric pressure blows over an insulated fl at plate covered with a thin wicking material which has been soaked in ethyl alcohol. The temperature of the plate is 25°C. Calculate the temperature of the air stream assuming that the concentration of alcohol is negligible in the free stream. Also calculate the mass transfer rate of alcohol for a 30 cm2 plate if the free stream velocity is 7 m/s.

B.     Helium gas at 25°C and 4 bar is contained in a glass cylin der of 100 mm inner diameter and 5 mm thickness. What is the rate of mass loss per unit length of the cylinder?

### 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….