Answer / alimohmad khatri

For coupling you have to lower down the BUS of R,Y,B phases
to connect them in Bus coupler breaker. this need space and
adopter panel is for the same.

Answer / dhiren

I really dont know the answer,please answer it

i need previous entrence exam papers of nhpc.

0 Answers  

---

Why a Permanent Magnet Generator has higher frequency as compared to frequency of main alternator?

0 Answers  

---

We wish to test 60 Hz systems from a 50 Hz supply. To acheive frequency conversion, we use a VFD. The VFD powers 40 kVA transformer, which has motor and non-motor loads on it. Will the transformer work?

2 Answers   Suzlon,

---

what is kvarh? Please difine it With calculation

3 Answers   GM General Motors,

---

Why is it preferred to use a wattmeter(s) to measure power in three phase systems rather than using a combination of other instruments e.g. voltmeters, ammeters etc?

2 Answers  

---

how does a current carrying conductor posess a magnetic field. what is the reason for the production of electro magnetic field around the conductor

2 Answers   Vizag Steel,

---

why link is provided in neutral of an ac circuit and fuse in phase of ac circuit?

4 Answers  

---

In a star to star transformer can we use a common neutral for both star connected primary and secondary

1 Answers  

---

What is use of 3phase instead of single phase?

12 Answers   DCM, L&T,

---

how to calculate the megger values for motors and cables?

2 Answers   Adhunik,

---

Is there any thumb rule for cable selection for any current rating ?

1 Answers  

---

Is it necessary to install Lighting Arrester on both side side (i.e HT and LT) of Transformer in a transmission substation? if yes Why on both side?

1 Answers  

---