Answer / trupti

synchronous motors run at constant speed irrespective of
load. i.e., weather you increase or decrease the load the
speed of motor does not change. however, there is a limit
upto what value the load can be increased, if the laod is
increased behind this value the motor stops rotating.
but in asynchronous motors the speed of the motor varies
along with the change in load.

Answer / antaratara ghosh

in addition to ans#1, the constant speed for synchronous
motor is the synchronous speed (120f/p) whereas the speed
of asynchronous motor is always less than the synchronous
speed, there remains some slip...

When we change the tap position of 10MVA transformer it suddenly tripped with Out of step indication and also with Static differential relay indication, Transformer Bucholz relay indn and Low oil level indication. Before 1 week the same problem occured by changing the tap position. but at that time only oltc bucholz relay activated. After testing the TxR Relay team & PET team cant find any solid reason. The values are ok also. So plz answer wat's the reason for this incident? anybody plz help.

3 Answers  

---

how to combine two linear transformers...............

1 Answers  

---

Why and which type of tertiary winding is used in most of the power transformer?

2 Answers  

---

What is the material used for the core of a high freiquency transformer?

3 Answers   Videocon,

---

Diff between power trans and generating transformer?

1 Answers  

---

what is the difference between earthing and grounding?

6 Answers   Bhel, Wipro,

---

what is unit of inductance

12 Answers   Bhel, Bosch, OSML, Vijai Electricals, Voltage,

---

in a delta-star with neutral grounding on star side what will happen if one star limb  got opened at star point

1 Answers   NTPC,

---

how can i find ct ratio of meter by seeing name plate of meter and how it should be used in MF calculation if it shows only-/1???

0 Answers   Harshal Electrical,

---

what is the current law ?

4 Answers   Aster, TCS,

---

What are the advantages of thermal power plant?

0 Answers  

---

Why dont we get shock while testing for voltage with a line tester? How the bulb inside the tester glows while testing with tester coz we are totaly isolated from earth or we are not giving close path for the current to flow?

3 Answers  

---