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HAL Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Is it possible to measure correct value of earth resistance & cable insulation ristance with out disconncting earth lead & both sides of cable ends? If not, any other method to measure ER & CIR with out disconneting from the system.

1101

Is it possible to use AC supply insted of DC supply in trip coil operation? if not, why?

5 4461

How to do cable earhing? whether by grounding Armour to ground or by running extra G.I wire along with cable? which one is preferred mostly amoung them? If the second one is more preferable how many GI wires to be run along with cable (1 or 2)?

998

Why the generating station rating is in KW though the rating of generators in KVA?

8 8160

What are the solutions for avioding sulfide formation at bimetalic (Copper &Aluminium)overhead joints?

2 2966





How to calculate no of Lighning arrestors are required for protecting 50mX 50m*20m cubical building and locations of LA?

991

What is the min.& max distance between two earth spikes is required for measuring earth resistance of an earth pit? Is the manufacturer of Earth tester decides this? Pls explain.

3 6829

what is the difference between UPS & Inverter

7 9954

What is the reasonable voltage between Neutral & Earth of an electrical system for good earthing?

6 7844

What is the general power consumption rating of CPU CRT type and Flat type, Monitor,Printer, projector, Scanner?

915

What is the current carrying capacity of 0SWG,3SWG,10 & 12 SWG solid bare overhead copper conductors?

2360

Is it reuired to use house service barcket for 31/2 core 300 Sq.mm cable,if the distance between pole & shop is around 2 mtrs only or can I hang the cable with GI support in air? upto what size of cable GI serrvice btacket is necessary?

1 2061

Can I do body earthing of machine by using Cable armour or I have to run another GI wire for body earthing and how many wires I need to run. Is there any rule for this. eartnig

3 3539

An ELHNC 80amp 240v 30mA RCD is tripping periodically, every 30 - 180 seconds is it safe to disconnect the protection circuit?

958

Please tell me what is the difference between online UPS & OFF line UPS?

2 4002

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