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ND 1 Electrical

The document outlines a series of questions for an ND 1 Electrical Exam covering various topics related to electrical energy generation, including steam and gas power plants, conductor materials, distribution systems, and fuses. It includes theoretical questions as well as practical problems, such as calculating the cross-sectional area of a distributor based on given parameters. Additionally, it addresses renewable energy sources like wind and solar power plants.

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jacobluka7
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86 views3 pages

ND 1 Electrical

The document outlines a series of questions for an ND 1 Electrical Exam covering various topics related to electrical energy generation, including steam and gas power plants, conductor materials, distribution systems, and fuses. It includes theoretical questions as well as practical problems, such as calculating the cross-sectional area of a distributor based on given parameters. Additionally, it addresses renewable energy sources like wind and solar power plants.

Uploaded by

jacobluka7
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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ND 1 Electrical Exam second semester

Q1ai. Why is electricity (energy) important in the society? (5mark)

Q1aii. Mention 5 ways of generating electrical energy?(2.5mark)

Q1bi. Write short notes on steam power stations?(5mark)

Q1bii. Draw the block diagram of gas power plants?(5mark)

Question 2ai. Write 5 advantages of steam power plant?(5mark)

Question 2aii. Mention 5 equipment of steam power station?(2.5mark)

Question 2bi. Write 8 advantages of gas power plant?(7.5mark)

Question 2bii. Mention 5 main components of gas power plant?(2.5mark)

Question 3ai. Write 5 properties of a conductor material used for transmission and distribution of
electric power?(5mark)

Question 3aii. Mention 5 commonly used conductor material in electrical engineering transmission and
distribution?(2.5mark)

Question 3bi. Explain copper and aluminum conductor?(3mark)

Question 3bii. List and explain the 3 classifications of overhead transmission line?(7mark)

4ai. In details, explain feeder and distributor?(8.5mark)

4aii. List three classifications of distribution systems?(1.5mark)

4bi. What are the various methods of feeding a distributor?(2mark)

4bii. A 2-wire dc distributor AB is 300m long. It is fed at point A with loads

of 30A, 40A, 100A and 50A at distances of 40m, 100m, 150m and 250m from A. If

the maximum permissible voltage drop is not to exceed 10V, find the crosssectional area of the
distributor. Take ρ = 1.78 x 10-8Ωm.

Solution:

Total voltage drop over the distributor is


V = i1R1 + i2R2 + i3R3 + …

For 2-wire distributor voltage drop is

V = 2(i1R1 + i2R2 + i3R3 + …)

Cross-sectional area A =

Resistance of section AC, RAC = ρl/A = 1.78 x 10-8 x 40/A

RAD = 1.78 x 10-8 x 100/A

RAE = 1.78 x 10-8 x 150/A

RAF = 1.78 x 10-8 x 250/A

V = 10V

10 = 2 x 1.78 x 10-8/A [(40 x 30) + (100 x 40) + (150 x 100) + (250 x 50)]

A = 116.34 x 10-6 m2

Question 5ai. Define fuse according to IEEE regulation?(3mark)

Question 5aii. Mention the three types of fuse?(1.5mark)

Question 5aii. Define current rating, fuse current, and fuse factor?(3mark)

Question 5bi. Mention two advantages and two disadvantages of fuse?(5mark)

Question 5bii. What are the three features of high-breaking capacitive fuse?(3mark)

Question 6ai. Draw the block diagram of wind power plant?(5mark?

Question 6aii. Write three disadvantages of wind power plant?(3mark)

Question 6bi. List five components of solar power plant?(5mark)


Question 6bii. Draw the block diagram of solar power plant?(4.5mark)

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