Answer / iamdon

At no load the speed of IM is VERY CLOSE TO SYNCHRONOUS
SPEED but not equal to synchronous speed.

As the mechanical load on the motor shaft is increased,the
motor slow down.Due to which the relative motion between
rotating magnetic field and rotor conductor increases.Thus
more emf will induce in rotor conductor according to
Faraday's laws.Since rotor conductors are short circuited
so more current is induced according to Lenz law.The
induced current will flow through rotor conductor causing
more electromechanical torque to be developed.In this way
motor meets the increased load demand.

Author:arbelectbit@yahoo.com

Answer / himansu prusti

according to this above question,when we are connecting a load across motor ,at the time motor will draw more amount of current which will dominant resistance present in the rotor,and hence the power factor will improved which will simultaneously improve the torque.because as we know torque in the induction motor is T=Er*Ir*cosφ.

What is the reason for low voltage in houses?

19 Answers   Maytas,

---

How to take Vector group test of Transformer?

16 Answers   Sunflag Steel, Zuari Cements,

---

What is the function of UV coil ACB?

6 Answers   DLF,

---

length of 4 core cable 95mm from substation LV VFD panel to Motor at field approximately 150 meter. Motor stop and power has been isolated from LV MCC ( Substation )to disconnect Motor for services. After Motor completed service propose to reinstall and reconnect Motor Cable, found earth cable sparkling during touching at metal / motor body. Inspect by clamp meter found earth cable have current flow AC 1-2amps and all earth cable at MCC LV also have current flow as same value. why it is happen?

2 Answers  

---

WHat is the general checks required for Dry type transformers

0 Answers  

---

can any tell me why slope 40% and 80% is calculated in differential protection?

0 Answers  

---

What is the test block protection relay if any body know plz explained

0 Answers  

---

Why Motors are generally supplied with 3 core cables??? why not 4C??

5 Answers  

---

what is rotating transformer? what is the uses of it?i mean applicaitons?

5 Answers   First Lead,

---

what is the significance of per unit impedance ?

7 Answers   HP,

---

7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?

0 Answers  

---

If one lamp connect between two phases it will glow or not?

9 Answers  

---