Answer / naresh

in case of dc ,the frequency is always constant .
where as in case of ac ,the frequency is defined as number
of cycles per second.

it is given by

F=(1/T).

Answer / pillay

Frequency measuring instruments are available ,just connect
across the voltages and the frequency can be determined
instantly. whereas as the abbreviation means the DC HAS GOT
NO FREQUENCY.

what is the difference between STAR and DELTA connection and application wise how it can be utilizedd ???

1 Answers  

---

What is corona? and what is the purpose of corona belt in substation ? why they connect these end of the buses ?

2 Answers  

---

What is Harmonic affects in power system. what is unit of harmonics and how to measure it. how much value should be in power system.

1 Answers  

---

how are reversing the direction of rotation of dc motor

0 Answers  

---

What is the difference between line drop and percentage line drop?

0 Answers   Suzlon,

---

What should be cable size for 75KVA 380/220 3ph transformer

3 Answers  

---

how many frequent start/stop operation possible in case of HT MOTORS.

5 Answers   DVC, Steel Plant,

---

how much load 15kva dg set can bear

7 Answers  

---

why we step up voltage for reducing the loss, even if voltage and current are proportional anr resistance remains same

12 Answers   Sarhad University,

---

how to take the 3 phase ups input and collect single phase output

1 Answers  

---

why transformer measures in kva

4 Answers  

---

how kva rating of transformer is calculated.

6 Answers   Fluor Daniel, Siemens,

---