Answer / siva kumar

UPS is a uninterrupted power supply, where as VFD is a variable frequency drive. VFD is used for controlling speed of the motors according to the below mentioned formula

speed(N)= 120f/p

f= frequency, p= no.of poles

poles are fixed at the design stage of the machine later we can't be modified so speed control is possible only controlling the frequency of the machine.

Answer / houssem

UPS converting incoming AC to DC through a rectifier and converts it back with an inverter with the same frequency

VFD converting incoming AC to DC through a rectifier and converts it back with an inverter with variable frequency according to operating point (Tm= V/F) of a motor

how i prepare interview for placement in IT companies

0 Answers   APC, IBM, Quality Kiosk, RDB, TCS,

---

i want to know about EPBX system in detail

12 Answers   Artefact Projects, India Infotech, Mannar Company, MNC, Siemens, Slash Support, TCS,

---

what is the eligibility criteria of mico bosch

0 Answers   Bosch,

---

what is cdma

5 Answers   Lucent,

---

how can i prepare for the apgenco can u send old qps to jeedipally@gmail.com

0 Answers   APGenco,

---

Which type of power plant is more easier to produce electrical power at economical condition?

0 Answers   HAL,

---

what is the exact difference between zener breakdown voltage and avalanche voltage??

3 Answers   TCS,

---

What are the advantages and disadvantages of jfet over bjt?

0 Answers  

---

what is the SKIN effect in a condactor and how can be decrease??????

3 Answers   Alstom,

---

find wrong number 76,20,32,84,325,1580

4 Answers   Banking, Sony,

---

TELL ME 10 PRODUCTS OF TCS?

2 Answers   TCS,

---

significance of transistor number

1 Answers  

---