Engineering Answers

Describe the composition , physical properties and mettods of fabrication , and uses of acid resistant brick

Discuss four alternatives that increase the use and application of conventional concrete.

What are the advantages of using a third-point loading flexure test over a

center-point loading flexure test? Draw a shear force diagram and a bending

moment diagram for each case to support your answer.

What is the purpose of performing the flexure test on concrete? How are the

results of this test related to the compressive strength test results?

What is the standard size of PCC specimens to be tested for compressive

strength? If a smaller size is used, which size is expected to provide higher

compressive strengths? Why? Which size provides strengths close to that of

an actual concrete structure?

5. Compute for the enthalpy, internal energy, and entropy of steam at 72oC and 93% quality. Please explain the answer?

The specific heat at constant pressure of 1kg fluid undergoing a non –flow constant pressure

process is given by:

𝐶𝑝 = [2.5 +

40

𝑇+20]kJ/kg-℃ where T is in degrees centigrade. The pressure during the process

is maintained at 2 bar and volume changes from 1m3

to 1.8 m3

and temperature changes from

50℃ to 450℃. Determine (a) heat added (b) work done (c) change in internal energy (d) change

in enthalpy