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Electrical Engineering Interview Questions

How to calculate rated currennt Of Mcb for 2hp motor...

20346

extremely urgent please, why a fuse is used before voltmeter but not with a ammeter connected to a CT(current transformer),thanks in anticipation.

7935

We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?

1448

sir i want previous entrance exam papers for written test

1510

watt meter have 4 terminals what there name??? and what theses 4 terminals indicates ?? and why 2 terminals are short circuited??

5235

what is Anti-pumping?

1319

what is the difference between single ratio, multiple core and multiple ratio, multiple core ? please explain.

NTPC,

1570

WHAT IS THE FUNCTION OF PULSE TRANSFORMER IN DC DRIVE

6121

what is difference Auto-transformer and ICT ?

CG, Descon,

12161

why the 4 terminal are named as main, line, common, voltage (M, L, C, v) of a wattmeter?? why not its nameed as A,B,C,D??

36313

what is the stear deltaprinceple?

1226

what is use of mccb.

1989

Which is the best between SCADA & PLCC & Why ?

ABC,

9483

sir vizag steel ka junior trainee ka paper kitne number ka ayega

1557

Hi,, Just I want ask, if the power factor decrease what happen in voltage regulation? Thanks..

2707

Un-Answered Questions { Electrical Engineering }

direction of tarbine& genrator

1453

why 15 kw motor winding resistance is low then 5 kw motor winding resistance?

2053

What are the two basic types of transformers?

465

Where can i get practical knowledge of solar system?

795

What is the role of power pack in substation protection system?

2051

please give me all the Alarm .Trip ,Safety Relays & Conditions of UPS Systems mail me on ashokbabunhce@gmail.com

1215

how does ELR works? explain

1946

What are the different types of LT Cables?

476

Write masons gain formula.

505

Explain the laying procedure and laying depth of submarine/subsea power cable for 220/400KV system? Also available cable diameter?

1533

1116

ii) A shunt motor supplied at 230V, runs at 900 rpm when the current is 30A. The resistance of the armature is 0.4 ohms. Calculate the resistance required in series with the armature to reduce the speed to 600 rpm, assuming that the armature current is then 20A. [12]

1546

technically, what is the reason behind starting the motor star the delta connection .. and what other ways to do this rather than using " star-delta transformer"

1391

send me all basic electrical question and answers

2357

what is the voltages using in movie theaters??? why ??why not other??

1567