Final Exam Set A Cpd30303 July2020 081220 Complete
Final Exam Set A Cpd30303 July2020 081220 Complete
Final Exam Set A Cpd30303 July2020 081220 Complete
FINAL EXAMINATION
JULY 2020 SEMESTER
DURATION : 2 HOURS
INSTRUCTIONS TO CANDIDATES
1. Please CAREFULLY read the instructions given in the question paper.
2. This question paper has information printed on both sides of the paper.
3. This question paper consists of TWO (2) sections; Section A and Section B.
4. Answer ALL questions in Section A. For Section B, answer TWO (2) questions ONLY.
Name :………………………………………………………………………...
ID :………………………………………………………………………...
Question 1
Table 2 shows the experimental data obtained from the steam motor experiment.
Question 2
Table 1 shows the experimental data obtained from the refrigeration experiment.
Question 3
(a) Calculate the number of rotations per second done by turbine, if the hydraulic power
generated is 24.2 Nm/s.
(6 marks)
(b) Calculate the increment of torque produced when the number of rotation per minute
increase by 30% and efficiency increase by 5%. Given Pel=51.35 W and ղ=78%
(10 marks)
(c) State two types of turbine and the difference between the two.
(4 marks)
Question 4
Steam power plant is widely utilized throughout the world for electricity generation. This plant
consists of a boiler, steam turbine, generator and other auxiliaries.
Question 5
A compressor is a mechanical device that widely used in a power plant to increase the
pressure of a fluid by reducing the volume.
m3
i. the volumetric flowrate ( )
hr
of the air at the inlet.
(5 marks)
ii. the hydraulic power (W) generated by the compressor.
(5 marks)
iii. the efficiency (%) of the compressor.
(2 marks)
Question 6
Non-destructive testing (NDT) plays an important role in many industries to ensure the
equipment perform their function in a reliable, safe, and cost effective manner.
Appendix A
N 2 πR ( F 1−F 2 ) N
1 bar = 100 000 W 1=
m2 60
kg . m ms (h1−h w )
1N=1 ηalignl¿ ¿ ¿= ¿
s2 Q1
1 Nm/s=0.001 kJ/s W1
η=
Q 1 + ms ( h w −h3 )
h1−h 4 ( Q ¿ )
COP=
h2−h1 ( W ¿ ) T =F × r
π 2 ( 100 ) ∆ p
Q= d 2
4 ρ √ (3600)
Phyd
η= x 100
Pel
h g−h f
x=
hfg
Pressure-Enthalpy Diagram