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(IELM213)7c5986 - final%20exam%20info%20+%20tutorial%20notes.pdf
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IELM213 FINAL:

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3hour open-book exam (calculators required; any form of PC not allowed)


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Calculations and open questions (no multi-choice question)


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Contents covered in IELM213 mid-term will not show up in final exam


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https://www.ab.ust.hk/ai/ai_admin.htm (click this link to check the time and venue of IELM213 final exam)


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The instructor has no authority to approve Final exam make-up; all requests had to be sent to university for approval




































IELM213 Tutorial

Question 1
The general office of IE department used 2 incandescent light bulbs as light source (50w 17lm per watt, and 1khr lamp life for each.). To response to the call of HK government on promoting energy efficiency and conservation, IE department decided to replace the 2 incandescent light bulbs with one CFL (Compact Fluorescent Lamp: a). They have three options:

A: 24W, 71lm/watt
B: 30W, 75lm/watt
C: 20W, 71lm/watt

Q1a) Which type of CFL should the IE department choose? Explain your reason.


Q1b) Which kind of material the incandescent light was made of? Explain your reason.


Q1c) Before the replacement, what is the value of the luminous intensity of the light source?


Q1e) Before the replacement, what is the illuminance level measuring at a distance of 3 feet from the light source?


Q1f) Assume the type of CFL chosen in Q1a have 10khr lamp life and the cost of electricity in HK is $0.8HKD per kWh, if the cost of a new incandescent light bulb is $5HKD and the cost of the new CFL is $35HKD

Calculate the money spent on incandescent lights and CFL over 10khr. Which one is saving more money? [Please list out the steps of your calculation]


Q1g) Before the replacement, the officers only occasionally perform visual tasks in the IE general office. If all the offices are under 40 years old and reading speed is important to them, what is the reflectance level of task background in IE general office if the illumination level (result of Q1e) was decided by following the approach of Illuminating Engineering Society?





Question 2
John and Mary were hired by XYZ corporations to do MHO work. John and Marys personal information were listed in the table below:
Name
John
Mary

Gender
male
female

Age
20
20

Body weight(kg)
70
60

MAP(liter/min)
3.5
2.5

BMR(kcal/min)
1.2
1.0




Assume 1 Liter O2 can release 5kcal of energy,

Q2a) using the above information to plot Figure 1

Figure 1. The relationship between the O2 uptake and the rate of work for John and Mary


Q2b) Please use completed Figure 1 to explain when O2 uptake can be used to access physical workload and when can not.

Q2c) Please use completed Figure 1 to show the range of physical workload in which the
anaerobic metabo