Answer / avd

In AC motor load current flows in stator and causes heating
of stator. Hence to cool it down fan is provided which
cools the body. To increase area fins or plates are there
on body.

In DC motor load current flows through armature, causes
heat generation in armature. To take out the heat you need
to cooldown armature. Stator cooling is not required, hence
plan body is okay.

Answer / yagnesh

only for cooling purpose ac motor has out side cooling fan
while dc has insite fan because we can very the voltage of
armature not of field so heat is generate is there so
require to cool the armature not field in ac motor
viceversa.

Rated moter voltage and frequency is 380volt 60 hz but moter is running at 380votac 50hz is this harmful for moter winding

1 Answers   Infosys,

---

why there is a phase shift lies between primary and secondary voltages of a transformer?

7 Answers   Mecon,

---

hi all, can any one tell me a website or document on basic interview questions on plc for a fresh diploma candidate?

1 Answers  

---

Is there any difference in AC current/ DC current carrying capacity of a conductor .What can be maximum current handling capacity of a 2.5mm stranded cu cable when connected to AC and DC supply.

1 Answers  

---

1)Explain why the cradle guard is used on railway crossing in overhead line construction?

0 Answers  

---

What work have you done on full chip Clock and Power distribution? What process technology and budgets were used?

0 Answers   Divis Laboratories, Intel, Sainor Labs,

---

To prevent the mal operation of a differentially connected relay while energizing a transformer, the relay restraining coil is baised with (a)second harmonic current (b)fifth harmonic current (c)third harmonic current (d)seventh harmonic current

2 Answers  

---

What is relation between mu(nought) and epsilon(nought)?

0 Answers  

---

if we supply DC power to AC transformer then what its result?

15 Answers  

---

where to use CT and PT?

4 Answers   CEB, Reliance,

---

How can we save electrical cost i.e switchgear, wiring, conduiting etc in a room?

1 Answers  

---

I HAVE A INCOMING 100A MCCB TPN 25KA, CABLE LENGHT OF 80M 70MM CABLE SIZE FROM MAIN SUBBOARD TO NEW DB.BASE ON THE FAULT LEVEL SETTING OF 45KA.I WOULD LIKE TO FIND OUT 25KA ENOUGH KA. APPRECIATE IF SOMEBODY CAN ASSIST ME WITH FORMULA FOR THIS. FRM: JEFF

0 Answers  

---