Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III DESIGN ESTIMATION AND COSTING OF ELECTRICAL SYSTEMS Previous Question Paper (May - 2019 - R16)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
What is Earthing?
Answer
Earthing is the process of connecting the non-current-carrying metallic parts of electrical equipment or the neutral point of the supply system to the general mass of the earth. It provides a low-impedance path for fault currents to ensure safety against electric shock and to stabilize system voltage.
How electric system is protected from short circuit?
Answer
Electrical systems are protected from short circuits using protective devices that detect abnormal current flows and isolate the faulty section. Key devices include:
- Fuses: Melt and break the circuit when current exceeds a specific limit.
- Circuit Breakers (MCB/MCCB): Automatically trip the circuit upon detecting overcurrent or short-circuit conditions.
- Relays: Sense fault conditions and signal the circuit breaker to operate.
What are the types of loads present in residential buildings?
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What are the types of loads present in commercial buildings?
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What are the voltage levels of overhead transmission lines?
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What are the voltage levels of underground distribution lines?
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What is a substation?
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What is the main purpose of substation?
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Define illumination.
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How illumination is measured? Explain.
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Part B
With the help of neat sketch, Explain about three phase four wire distributed system.
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Discuss in detail about the guidelines for the installation of fittings.
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Discuss about various protections of electrical systems.
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Explain in detail about the location of switches and outlets.
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What are the factors to be considered for electrical installation of residential building? Explain.
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Discuss in detail about the estimation of material for the electrical installation of commercial building.
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How electrical installation is done for commercial buildings? Explain.
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Discuss in detail about the electrical installation of small industries.
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Explain in detail about the type of support required for overhead distribution lines.
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Discuss in detail about the mechanical design of overhead lines.
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Discuss in detail about the material required for the laying of overhead transmission lines.
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Compare overhead and underground distribution lines in selection.
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Discuss in detail about various types of substations.
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With the help of neat sketch, discuss about floor mounted type substations.
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What is an outdoor substation? What are its features?
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What are the advantages and disadvantages of pole mounted type substations? Explain.
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Explain in detail about the laws of illumination.
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What is OCFL? Discuss in detail.
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What are the various types of light sources? Explain.
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Explain the functional differences between LED and CFL.
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