Answer / praveen kumar paulraj

PLC based process automation panels. which is nothing but
control system which uses PLC .the same process can be
controlled by other control systems, but, why by PLC because
in PLC we can write the logic by ladder diagrams,so that the
electrical engineer can understand the logic and, he can
easily re-program the logic in side the plc because the
ladder logic is just like wiring diagram.

Answer / prvn

the control system which uses PLC is called PLC Based
control system .why PLC because we write ladder logic in plc
. it is invented for electrical engineers ladder logic
diagram is as same as relay logic diagram so they can
understand the logic inside the PLC. we can control system
also other means

why secondary of transformer always grouded?

1 Answers   IIUC, Sodexo,

---

what is mean by hormonics & surge? and it's effects?

1 Answers   TCS,

---

Why not LED burn after showing alarm,as Alarm volt is 11- 13,But LED is of3 volt,why it isnt Burn??

1 Answers  

---

Which motor connection is preferable star-delta or delta-star?

0 Answers   IOCL,

---

what is the relation between reactive power and power factor for the what is the limit of reactive power and power factor

0 Answers  

---

What is the tests required for a 132 kV, 400 kV , 765 kV for a Circuit Breaker and Power Transformer before commissioning ?

0 Answers   Eprosys Engineering Consultants,

---

Why Ferranti effect is occoured in leading power factor load in a overhead transmission line?

1 Answers  

---

Distinguish between Earth & Neutral?

5 Answers   Essar,

---

In a tap changing transformer where is the tap connected, is it connected in the primary side or secondary side?

0 Answers  

---

why in america the supply frequency is applied as 60 HZ. but in india we use 50 HZ.

1 Answers   Elcom International, HCL, NTPC, OMC,

---

role of europe union in UK safety legistlation (electrical safety)

0 Answers  

---

Difference between transition and diffusion capacitance

0 Answers  

---