JNTU
JNTU B.Tech IV INDUSTRIAL ELECTRICAL SYSTEMS Previous Question Paper (July/August - 2022 - R18)
Answer any five questions
All questions carry equal marks
Main
Explain the following types of switches in detail:
Surface switch
Answer
A surface switch is mounted directly onto the surface of a wall or partition using a base block, typically made of wood or PVC. It is easily accessible for installation and maintenance but is less aesthetically pleasing as it protrudes from the wall surface.
Flush switch
Answer
A flush switch is installed inside a wall or partition, sitting flush with the surface. It is mounted within a recessed box, providing a neat, clean, and modern appearance. These are the most common switches used in residential and commercial electrical wiring.
Ceiling switch
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Pull switch
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Push button switch
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Explain the working of Miniature Circuit breaker along with its uses.
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List the various Electrical safety measures that need to be taken at work place hazardous systems.
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How do you fix size of various wires usage in residential buildings?
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Explain various types of earthing systems.
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Explain the following types of internal wiring:
Cleat wiring
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Wooden casing and capping wiring
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PVC sheath wiring
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Metal sheathed wiring
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Conduit wiring
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Explain the following terms with respect to illumination:
Luminous flux
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Radiant Efficiency
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Plane and Solid angle
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Luminous intensity
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Candle Power
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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 50 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 3 m away from the vertical axis of the lamp.
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Explain how static capacitor and synchronous condenser and phase advancers are helpful in improving Power factor.
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List the counter measures taken from lighting protection.
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Write short notes on the following:
D.G systems
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Selection of UPS and battery banks.
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