Answer / sunil pargania

inverter convert DC in to AC, but not pure AC some DC
component remain left in inverter's output volt. so due to
this DC component fan give the noise.

Answer / raxit

Inverter output contains harmonics and THD of inverter is also high that detract motor performance.

Answer / vinodkumarkkp

When dc to ac is converted , it is 12 v ac and t/f step up and due to this t/f does not step upto 220 v ,i.e. Nearby 220 v it is stepped up . But fans are not working properly below 220 volts a.c. I think this is also a reason.

Answer / abhishek singh

capacitor ckts are present in invertours which converts dc
to ac current because capacitor does not passes dc
current.but all dc current are not able to filtered
through inverter some remains present in the current which
causes a sound in fan.

Answer / dhaval

when we connect a celling fan with jenreter then pure
voltage like 240v is not provided fan even thogh it produse
some noise

Sir pl provide 5 year sample paper for post junior engineer(electrical).I have currently applied for junior engineer (electrical) on RRB Ajmer

0 Answers  

---

why DC current not used in Transformer action?

17 Answers   Engineers India Limited,

---

i work as a technician at a private company.. i used to take amp reading for certain appliances such as air con.. the problem is when i clamp the neutral, wire there is a current reading.. from my understanding for single phase system neutral should not have current unless if the circuit is not complete.. yet the air con still work

3 Answers  

---

for ac networks if the voltage wave form is V=Vm sinwt here the voltage Vm=230 for the frequency 50hz then the time period is 0.02 sec then for the time period 0.12 sec what is the voltage

4 Answers  

---

Any body can help me in getting LT panel test procedure.

0 Answers   TATA,

---

---

how one can check the Current of a DC 12 V battery ? Procedure. I told that take a thick wire (having more wires in it) and then join the + and - terminals of battery with the help of two ends of a thick wire .... is this correct or wrong .....

1 Answers  

---

is that any software calculator to calculate the size of cable

0 Answers   JSW,

---

A transformer is used to light a 24volts,70watts lamp from a 240a.c main.The current in the main cable is 0.35A. Calculate, (1) The efficiency of the transformer. (2) the current in the lamp.

1 Answers  

---

how voltage regulator works ?

1 Answers  

---

why full load voltage is less than no load voltage?

4 Answers  

---

What is the control action?

0 Answers  

---

how do you select the ct/pt rating in substation

1 Answers   Apollo, Shreem Electric Ltd, Tata Motors,

---