why 30kva ups buzzing(hamming) sound?

2 Answers   Madhya Pradesh Electricity Board MPEB,

---

Why Transformer in KVA?

41 Answers   APCPDCL, Apollo Power, College School Exams Tests, Electrical Tech, Hitech, HP, L&T, MDL, Oil and Gas Jobs, TATA,

---

What is the minimum value of hfe for the oscillations in transistorized rc phase shift oscillator?

0 Answers  

---

what is magnetizing and demagnetizing current in generator and motor?

0 Answers   HBL Power Systems,

---

how to calculate power loss cost of aluminium conductor and copper conductor?v=500v.i=100A.x-section area=68mm.squre conductor

1 Answers  

---

In a three-phase full converter, output voltage pulsates at frequency of a. f b. 2f c. 3f d. 6f

2 Answers  

---

Which motor has more efficiency ;Synchoronous or Induction motor ?

4 Answers   TATA,

---

Hi Friend I am used multimeter to measure the voltage between R Phase(SS1) to R Phase(SS2). In SS1 is connected with UPS loads. But I am getting voltage between these 2 R Phases. Please give some idea friend

0 Answers  

---

why we used star delta starter for above 5hp motors

2 Answers  

---

What Is Transformer Impedance ?

6 Answers   Con Edison,

---

WHAT IS A LINE CURRENT AND PHASE CURRENT

3 Answers  

---

why they were using TRIAC instead relay in some controllers and what is the advantages.

0 Answers  

---