Answer / ravi kumar

Safety of vcb :[ Vacuum circuit breaker]
1: Earth fault relay
2: Master trip relay
3: Supervision relay
4: Short circuit
5: Shunt relay
6: Closing coil

Answer / arvind kumar

VCB SEFTY
Earth fault
Short circuit
Over current

Answer / kumar manish

VCB saftey-
1.Earth leakage
2.Current unwanted due to Short Circuit.
3.Over load

Answer / vijay raj

Oil type transfomar sefty ans dry type

Answer / bhanu pratap singh

all right

At light load transformer efficiency is less because A secondary output is low B transformer losses are high C fixed loss is high compared to output D copper loss is small

1 Answers  

What is the cause for a blown fuse in one phase of primery side(HV) of a three phase transformer( 4169v-460v) in the time of closing its supply breaker. There is no load on the secondery side of the transformer in this moment.

3 Answers   Novachem,

Can VFD step up to 60 Hz if it is designed to receive 50 Hz input?

3 Answers  

Why we oil in tranformer/

5 Answers  

In the Variable Voltage Variable Frequency Drive, how the Voltage and Frequency varied ? Is it varied in the Inverter part of the Drive ? Please give us supporting document if any.

0 Answers  

what is looping circuit in electrical lighting circuits?

5 Answers   L&T,

Which of the following are ill suited for energy efficient motors application?

0 Answers  

If the load is 10Kw and power factor has to improve from 0.5 to 0.8,how can we select the capacitor rating accordingly.Illustrate by showing formula?

9 Answers  

Sir, I have applied for the of Assistant.engineer of NPDCL. please send me all AP TRANSCO AND JENCO solved papers of previous exams . I requested send me the papers to my id as soon as possible (rajanikanth_peddi@yahoo.co.in) (This is very urgent) Thank You,

0 Answers   APTransco,

Make a list of materials and layout diagram for a 35hp motor, to be wired at 35meter away from the MDB in a chemical factory.

2 Answers   FEWA,

what is the use of cable in our environment ?

0 Answers  

what is the use of starter in tube light?and what it contains

12 Answers   L&T, RRB,