In generation,transmission and distribution voltage frequency is either 50HZ or 60 HZ;why are only these frequencies?

2 Answers  

---

what happen as when voltage drop(or may decrease) ? in case of atomic base theory?

0 Answers  

---

WHY IS THE POWER FACTOR NOT MORE THAN UNITY.

6 Answers  

---

what will be project cost for 100 kv transformer connection under oyt scheme.

0 Answers  

---

What is required of exietation to the alternater.

4 Answers  

---

what will be efficient rating of ac motor to lift a 10 kg wt of stone to 10 meter height with input 220V AC 50 Hz frequency???

1 Answers  

---

how netral CT is selected (including its details specification)

8 Answers   ABB, ABC, dbpl, Mecon, Shree Engineering, Tapasya Transformers,

---

in 400 kv system why should trip both side CB when we give hand trip?

1 Answers   KPTCL, NHPC,

---

what is the requirement regarding earthing of Single conductor with AWA

0 Answers  

---

Explain with example of functional requirements of protection relay in terms reliability, selectivity, sensitivity

0 Answers   NCC,

---

what is stepping motor and where can use in electrical installation.

3 Answers  

---

how to calculate the transformer losses.

4 Answers   Cipla,

---