1) What is the difference of dynamic compressor (blowers) and normal compressor? Name 2 types of pump from each category

2 )Sketch and explain two types of blowers;

Subject ( Application of Pneumatic and Hydraulics)

If a gas is flowing at 300m/s and has a pressure and temperature of 90kPa and
20°C, find the maximum possible velocity that could be generated by expansion
of this gas if the gas is air and if it is helium

Material A is generating heat at a rate of 11.25 x 10^3 W/m^3 and is 40cm thick and has a thermal conductivity of 10 W/mK. Material B is 50 cm thick with an unknown thermal conductiviy. material C is 30 cm thick and has an unknown thermal conductivity. The structure is cooled by a fluid on both sides at 25 (C) with a heat transfer coefficient of 100 W/m^2K. If your thermocouples measure T1 to be 145 (C) and T2 to be 195 (C), find the thermal conductivites of materials B and C.

What is the function of the desiccant bag inside an accumulator?

m

What is an edge dislocation and how does it assist in the process of slip in a crystalline metal?

Explain key reasons why using sandwich structures are beneficial compared with the corresponding homogeneous structures. Give THREE applications of sandwich structures.

State how Mindlin Theory differs from Thin Plate Theory and suggest an application.

1.        

(a) Using a normal distribution, define what is meant by both “ machine” and “process” capability and explain the difference by providing three measures that are used in each case.                                                                     [8 marks]

(b) The following data was obtained from subgroups of parts manufactured to 10.5 mm +/- 0.5 mm

Size Range (mm)                     Quantity

10.0-10.2                                 1

10.2 -10.4                                4

10.4 -10.6                                9

10.6-10.8                                 6

Determine :

The mean and standard deviation [use N = 20 ]                          [6 marks]

The values of the capability indices Cm and Cp                          [4 marks]

If the operation can be judged as “capable” if considered to be a machine or alternatively a process? [2 marks]

Derive the flexural rigidity of a sandwich beam whose breadth is b, which has a core of thickness c and skins of thickness t each. The distance between the centroids of the skins is d, the skin and core moduli are Es and Ec respectively.

Explain two reasons why plate structures affects significantly the lightweight (i.e. ship hull, machinery, outfit and permanent equipment, etc) of a ship.

0.025 of moist air at 18°C dry-bulb and 10°c wet-bulb temperatures mixes with 0.005 kg/s of air at 38°C and 29°c wet-bulb. What is the mixture dry-bulb temperature, humidity ratio, relative humidity, and dew point? What are these parameters if the second stream flow rate is increased to 0.01 kg/s?

For the elastic body defined in Question 1 (below), define the boundary conditions in terms of displacement, assuming the boundary surface at the point in question has direction cosines with respect to x and y and z equal to l=0.8 and m=0.6 and n=0 . Consider the case when the change in volume is negligible.

Are all the compatibility equations satisfied for the Plane Stress conditions? If not, which equations are not satisfied? Explain the case for the Plane Strain conditions?

Question 1:

Write down the equilibrium equations for a three-dimensional isotropic material in terms of displacements. Assume that the material modulus of elasticity, Poisson ratio and density are, and that the body forces are due to the material weigh and the constant gravitational accelerations applied in z-direction.

Based on experimental observations, the acceleration of a particle is defined by the relation a = –(0.1 + sin x/b), where a and x are expressed in m/s² and meters, respectively. Know that b = 0.96 m and that v = 1 m/s when x = 0.

1)The velocity of the particle

2)The position where velocity is maximum

3)Determine the maximum velocity. (Round the final answer to three decimal places.)
The maximum velocity

Write down the equilibrium equations for a three-dimensional isotropic material in terms of displacements. Assume that the material modulus of elasticity, Poisson ratio and density are, and that the body forces are due to material weigh and the constant gravitational accelerations applied in the z-direction.