Industrial Electrical Systems — Winter 2021

State any four general rules for residential installation.

Explain different types of electrical wiring system. Athree occupant building has to be electrified independently from a common energy meter. Design the distribution boards with

accessories for each resident having 10nos of light circuits, 6 nos of power circuits.

Define: industrial automation. State its need and importance.

Classify electric elevators. Develop a block diagram of PLC with basic components and its

functions.

Build architecture of SCADA system with neat diagram.

Define following terms referred to illumination: (a) Space-height

ratio (b) Utilization factor (c) Waste light factor Aroom with an area of 6 × 9 m is illustrated by ten 80-Wlamps. The luminous efficiency of the lamp is 80 lumens/Wand the

coefficient of utilization is 0.65. Find the average illumination. Describe through illustrations the following types of lighting

scheme: (i) Semi-direct (ii) Semi-indirect

Define following terms referred to illumination: (a) lumen

Candle power (c) Glare The flux emitted by 100-Wlamp is 1,400 lumens placed in a frosted globe of 40 cm diameter and gives uniform brightness of

250 milli-lumens/m2 in all directions. Calculate the candle power of the globe and the percentage of light absorbed by the globe. Explain Construction and working of compact fluorescent light

Define:1)MCB 2)ELCB 3)MPCB Distinguish between LT and HT Motor? Analyze with an

example. The monthly readings of a consumer’s meter are as follows : Maximum demand = 50 kW,Energy consumed = 36,000 kWh Reactive energy = 23,400 kVAR.If the tariff is Rs 80 per kW of

maximum demand plus 8 paise per unit plus 0·5 paise per unit for each 1% of power factor below 86%, calculate the monthly bill of the consumer.1

List out steps to be followed for safety precautions against an

electric shock.

Compare PCC and MCC panels. Asupply system feeds the following load.(i)a lighting load of 500 kW (ii)a load of 400 kW at 0.707 p.f. lagging (iii) a load of 800 kW at 0.8 p.f. leading.(iv) aload of 500 kW at 0.6 p.f. lagging v)a

synchronous motor driving a 540 kW d.c. generator and having overall efficiency of 90%.Evaluate the power factor of synchronous motor so that station Power factor may become unity.

List out steps for selections of transformer.

Describe selection procedure of ELCB for industrial dwelling. Analyze with an example (a) load calculation and sizing of wire,

rating of main switch residential wiring system.

List out different types of UPS. Illustrate a single line diagram of indoor substation showing all

accessories of the system. Distinguish between continuous power, prime power and standby

power related with standby generator.