Cee 0104 Electrical Installation Question Paper
Cee 0104 Electrical Installation
Course:Certificate In Electrical Engineering
Institution: Meru University Of Science And Technology question papers
Exam Year:2013
QUESTION ONE – 30 MARKS
a. State in sequence the main tests which should be carried out on completion of an electrical installation. (4 Marks) b. Explain any three factors which affect the choice of wiring system. (6 Marks) c. List two advantages and one disadvantage of the following wiring system. i. Conduits (3 Marks) ii. Trunking (3 Marks) iii. PVC armoured (3 Marks)
d. Define earthing as applied to electrical installation. (1 Marks) e. With reference to earthing systems distinguish between continuous neutral and-earthing leakages circuit breaker-systems of earthing. (6 Marks) f. Explain stroboscopic effect and how it can be prevented. (4 Marks)
QUESTION TWO – 15 MARKS
a. With the aid of a labeled diagram explain how the following tests can be carried out on an existing electrical installation. i. Verification of polarity (5 Marks) ii. Ring main test (5 Marks)
b. Explain the procedure of final hand-over of a completed installation work to a client. (5 Marks)
QUESTION THREE – 15 MARKS
a. List any three methods of earthing. (3 Marks) b. With the aid of a labeled diagram explain the earth electrode resistance test. (6 Marks) c. With the aid of a wiring circuit explain the principles of operation of a voltage operated earth leakage circuit breaker. (5 Marks)
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QUESTION FOUR – 15 MARKS
a. With reference to illumination define the following: i. Luminous intensity (1 Mark) ii. Glare (1 Mark) iii. Coefficient of utilization (1 Mark) iv. Luminous flux (1 Mark)
b. With the aid of a suitable wiring circuit explain the principle of operation of a fluorescent fitting. (5 Marks) c. An office (18 x 43 x 6)m requires an illumination at desk level of 330lux. The mounting height of the lamps above the desk level is 2m. The following alternatives are applicable: i. 80w twin fluorescent fittings giving 9600 lumens when new ii. 150w tungsten filament lamps giving 4000 lumens when new
Determine the number of lamps needed for each alternative assuming a coefficient of utilization of 0.75 and a maintenance factor of 0.85. Comment on your results and sketch a plan of the fittings. (6 Marks)
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