Industrial Electrical Systems — Winter 2022

List out any three general rules for residential installation.

Explain requirement of commercial installation.

Illustrate single line diagram (SLD) of wiring system.

State the need of Contactor, Isolator, and protective Relays.

Classify electric elevators.

Sketch architecture of SCADA system with neat diagram.

Sketch a block diagram of PLC with basic components and its Functions.

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

Glare (c) Candle power

Aroom with an area of 6 × 9 m is illustrated by ten 40-Wlamps. The luminous efficiency of the lamp is 100 lumens/Wand the coefficient of utilization is 0.65. Find the average illumination.

Describe through illustrations the Different types of lighting scheme.

Define following terms referred to illumination: (a) lumen (b)Waste light factor (c) lamp efficiency

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 (CFL).

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

List out steps to be followed for safety precautions against an electric shock.

Analyze earthing of commercial installation.

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) a load of 500 kW at 0.6 p.f. lagging v)a synchronous motor driving a 540 kW d.c. generator and having overall efficiency of1 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.

Distinguish between continuous power, prime power and standby power related with standby generator.

List out different types of UPS.

Illustrate a single line diagram of outdoor substation showing all accessories of the system.

Analyze the needs of DG system with advantages & disadvantages.