JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV INDUSTRIAL ELECTRICAL SYSTEMS Previous Question Paper (January/February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Distinguish in detail about the Pendant holder and batten holder
Answer
A pendant holder is designed to be suspended from a ceiling rose using a flexible cord, allowing the lamp to hang at a specific height. It is primarily used for general illumination in rooms where adjustable or low-hanging light sources are required. In contrast, a batten holder is designed to be fixed directly onto a wall or ceiling surface, typically mounted on a wooden block or a conduit box. It provides a rigid, stationary light source and is commonly used for direct lighting in areas where space is limited or where a flush-mounted fitting is preferred.
What is electric shock? How to protect a person from it?
Answer
An electric shock is a physiological reaction that occurs when an electric current passes through a person's body. It happens when the body becomes part of an electrical circuit, causing involuntary muscle contractions, burns, or cardiac arrest depending on the magnitude and duration of the current.
To protect a person from electric shock, the following measures are essential:
- Use Residual Current Devices (RCDs) or Earth Leakage Circuit Breakers (ELCBs) to detect small leakage currents and disconnect the supply instantly.
- Ensure all electrical equipment is properly grounded (earthed) to provide a low-resistance path for fault currents.
- Utilize double insulation or non-conductive enclosures for tools and appliances.
- Implement safe work practices such as using insulated tools, wearing personal protective equipment (PPE) like rubber gloves and boots, and ensuring equipment is de-energized before maintenance.
How do you calculate the rating of a main switch?
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List the advantages of casing and capping wiring used in residential buildings.
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Define the term Depreciation factor.
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Explain the laws of illumination.
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List the various equipment required in a substation.
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List and explain the various harmful effects of lightning.
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What is a MCC panel and explain its significance?
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What do you understand by the term Battery sizing?
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Part B
Explain in detail about the Miniature Circuit breaker and also give its uses.
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What is Concealed wiring and list its advantages and disadvantages?
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Define the term Electric Hazard and explain the points to be remembered for working safely around electrical equipment.
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What is the main aim of using Motor Protection Circuit Breaker (MPCB) and explain its working with a neat diagram.
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Explain in detail about batten Wiring and list its advantages and disadvantages.
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Explain the arrangement of installation components in a consumer’s premises of industrial type.
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Explain the various methods of different earthing arrangements.
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Explain the features that are considered for Fuse / Circuit breaker selection scheme.
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Explain the following terms: a) Luminous Flux b) Plane angle c) Candle power d) Illumination e) Lux or meter candle.
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List and explain the various types of Lighting schemes.
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The illumination at a point on a working plane directly below the lamp is to be 100 lumens/m2. The lamp gives 150 CP uniformly below the horizontal plane. Determine: i) The height at which lamp is suspended. ii) The illumination at a point on the working plane 2.8 m away from the vertical axis of the lamp.
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Explain the Single bus bar arrangement in a substation with a neat diagram.
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Explain the various types of lightning strokes with respect to consideration on overhead lines, towers and substations etc.
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Explain in detail about the Direct on line starting for a Induction motor with a neat connection diagram.
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List the various specifications that need to be considered for LT breakers.
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Explain in detail about the working of UPS.
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Explain the various information that is required for sizing of battery.
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Explain various auxiliaries that are required apart from a diesel – generator set in a Diesel Power station.
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