B.TECH - Semester 8 electrical system design Question Paper 2021 (feb)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- Briefly explain the electrical services in buildings.
- List out the protection measures considered for the design or electrical installments.
- Discuss the energy conservation techniques in Air conditioning system.
- Briefly discuss the criteria for selection of fuse/MCB in main distribution board.
- Compare indoor and outdoor substation.
- Explain importance of earthing system in substation (11kv).
- Explain the pre-commissioning tests of transformer.
- Explain the key features of good lighting design.
- Write short note on street lighting.
- Explain the aspects in electrical installation of high rise building. Answer any one questions from each Module.
- Determine the specification of distribution board and the number of sub circuits for the residential building as shown in figure. Also draw the single line diagram (schematic diagram) of a installation.
- (a) Briefly explain the working of ELCB with neat connection diagram.
- (b) What are the safety aspects applicable to low and medium voltage installations? Explain.
- Estimate the quantify of material required for erection of $400 \mathrm{kVA}, 11 \mathrm{kV} / 400 \mathrm{~V}$ indoor type substation.
- A $10 \mathrm{hp}, 415 \mathrm{~V}$, 3-phase, 50 Hz induction motor is to be installed in a workshop. The plan of the workshop is shown below. Draw the wiring layout and estimate the quantity of material required.
- (a) Explain the aspects in design of electric systems in
- (i) Escalator (ii) Lifts 10
- (b) Explain key features of Kerala cinema regulation act 1958.10 OR
- (a) Explain the types of lighting schemes. 10
- (b) Explain yard lighting and flood lighting.
- What is the relevance of labelling by Bureau of Energy Efficiency?
- Draw the standard symbols for a circuit breaker and current transformer.
- Explain the use of ELCB in domestic installations.
- Draw the wiring diagram for a lamp controlled from two switch boards.
- What are the criteria for the selection of main distribution board in a wiring scheme?
- List the pre-commissioning test on cables.
- What are different types of switchgears used in substations?
- Define transfer and step potential referred to EHT substations.
- Where do you need earth-mat installations? Give an example.
- What are the factors affecting the coefficient of utilisation in illumination schemes? $$ (10 \times 2=20 \text { Marks }) $$ P.T.O. Answer any one full questions from each Module.
- (a) Describe the major safety aspects applicable to domestic electrical installations.
- (b) Explain the different electric services in buildings.
- (c) How do you classify installation voltages? Mention their standards.
- Write notes on the following : (a) National Electric Code
- Write notes on the following : (b) Indian Electricity Rules 1956
- Write notes on the following : (c) Electricity Act 2003
- Write notes on the following : (d) IS codes for electrical installations.
- (a) Draw a typical wiring diagram staring from energy meter for a room with one light, one fan and a 6A socket. Describe the function of each element.
- (b) List out the practices for energy conservation in lighting loads and domestic buildings.
- (a) Draw the installation plan, prepare an estimate of the materials required/labour and find the cost for the following wiring requirements. Three lamps, 3 sockets $(6 \mathrm{~A})$ and 3 fans with regulators are to be installed in a room $20 \mathr...
- (b) Explain the pre-commissioning test of a dometic installation.
- (a) What are the commonly used drives in medium voltage industries? Explain their characteristics. How do you select a drive for an application?
- (b) Describe the selection criteria for standby generation.
- A workshop is to be installed with 2 numbers of $5 \mathrm{Hp}(400 \mathrm{~V}, 3$ phase $)$ Induction Motors, one IHp ( 230 V , single phase) induction motor, 1 kW lighting load three 6 A sockets and 2 power sockets. Make necessary assumptions. Prep...
- (a) Describe the design of earthing system for an HT consumer.
- (b) Explain the illumination systems for yard lighting and flood lighting.
- (a) What are the different factors to be considered in the design of electrical installation in a Recreation/high rise building?
- (b) What are the salient features in the Kerala Cinema Regulation Act 1958?