Answer / deepak24

Iron Loss:- proportional to Frequency
Copper Loss:- Proportional to square of the frequency

If a transformer of rating 50 Hz connected to 500 HZ frequency then Iron Losses and Copper losses in the transformer increased and efficiency decrease. it is to be noted that losses are dissipated as heat so transformer may get effected.

why the efficiency of the dc machine is high ,when it is operated as a generator?

3 Answers  

---

If one 10 Hp 3phase induction motor connected in 380volt 50Hz. and again its connected to 380volt 60Hz. howmuch currrent and power take on both time?????

1 Answers  

---

I am shobana from Chennai. I am having my personal interview on 19th Dec at Chennai.kindly mail me the questions to mail id shobana.shanthi@gmail.com

0 Answers   Avalon, KK Capital,

---

what is ratio test?

1 Answers  

---

Why efficiency in thermal power plant is low?

1 Answers  

---

why we avoid parallel operation of diesl generator?

4 Answers  

---

We have 420volts, Diesel gen-sets each 750kva 4nos. we are operating with bus bar duct having 10x150mm for each face 4nos. our question is what is the minimum gap required between each face? is there any satutory regulations?

1 Answers   Alliance One,

---

what is ripple component in ac supply?

2 Answers  

---

Name different types of fault and which instrument is used to measures earth,short,open cicuit fault?

6 Answers   NTPC, Vijai Electricals,

---

what is thermo stat, explain how its working?

1 Answers  

---

how am i achived model paper to prepratio for bhel exam

2 Answers   Bhel,

---

What are the basic components of the feedback control system?

1 Answers  

---