Answer / prabhu

The speed of the dc series motor rises when the load of the motor decreases due to decrease in field current or armature current (field current = armature current in series motor). decrease in field current or armature current causes decrease in field flux so speed increases, because field current is iversely proportional to field flux.

If we say that an cable of size 3.5X 50 mm sq. can take current upto 140 amps,is it the current of single core of the cable or of all the cores jointly.

3 Answers  

---

tell me the various standerd of CT ratio

1 Answers   ICA,

---

why square root 2 is multiplied with line voltage in selection of LA ie 11/sqrtroot3=6.35 kv and it is multiplied with sqrt2 ie 6.35 KV*sqrt2=8.9 kv we will select 9kv.my question is why we are multiplying with sqrt 2?

1 Answers   KSPL,

---

what is the phase voltage and line voltage in 2 phase power supply?

1 Answers   EID Parry, IBM,

---

Why do we need ring main unit (RMU). what is its purpose and its advantages . what is the operating function of rmu

6 Answers   MahaDiscom,

---

---

why the substation require din electrical system?

1 Answers  

---

some ac motor's direction get change dueto ghanging input to the ac drives.(say ryb to rby). but some motor direction remains the same when phase sequence is changed fromdive side. can anybody guide me?

1 Answers  

---

What is the difference between Earthing and Neutral?

13 Answers  

---

What is difference between AC and DC resistance

9 Answers   Eaton,

---

what is difference between low voltage and high voltage

3 Answers  

---

A 30KW motor running at 1450 rpm draws 56A, how would you determine if this is correct or not?

3 Answers  

---

What is ONAN/ONAF1/ONAF2 for transformer cooling

5 Answers  

---