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1. MBEYA UNIVERSITY OF SCIENCE AND TECHNOLOGY
INSTITUTE OF SCIENCE AND TECHNOLOGY
DEPARTMENT OF ELECTRICAL INSTALLATION
TUTORIAL QUESTIONS.
MODULE NUMBER: 301
MODULE NAME: PERFORMING ILLUMINATION TASKS
PROGRAMM/COURSE: NVA/CBA III 2025
QUESTION ONE:
(a) Define the following terms as used in illumination purposes
i.Light
ii.Light level assessment
iii.Solid Angle
iv.Luminous Intensity
v.Illumination
vi.Luminance
(b)State the laws of illumination (Three Laws)
QUESTION TWO:
A lamp giving out 1200lm in all directions is suspended 8 m above the working plane. Calculate
the illumination at a point on the working plane 6 m away from the foot of the lamp.
QUESTION THREE:
A piece of paper lies on a table 2 m away from a point directly below a bulb of 100 cd and is 4 m
above the table. Calculate the illumination on the centre of the paper in lux.
QUESTION FOUR
A hall 30 m long and 12 m wide is to be illuminated and the illumination required is 50 meter-
candles. Calculate the number of lamps required taking a depreciation factor of 1.3 and
utilization coefficient of 0.5 given that the output of the lamp to be used is rated 100 W, 1615
lumens.
QUESTION FIVE
A light source has an illumination of 100 footcandles (fc), what is the illumination in lux?

Ileje District Vocational Training Center –[ Ileje DVTC]