Why we use two wattmeter during block rotor test and no load test of
3phase induction motor? And how can we understand the neat power
requirement of from this test?

Answers were Sorted based on User's Feedback



Why we use two wattmeter during block rotor test and no load test of 3phase induction motor? And h..

Answer / k,prakashchandra

As the pf is very low, one of the 3 watt meters will show
negative reading

Is This Answer Correct ?    7 Yes 1 No

Why we use two wattmeter during block rotor test and no load test of 3phase induction motor? And h..

Answer / natchi

In this test, we use two single phase wattmeters or one 3phase wattmeter, during test one of the 1phase wattmeter reads positive value and other one reads negative value of 3 phase power.

but in usage of 3 phase wattmeter gives directly the whole power of 3 phase supply.

Is This Answer Correct ?    8 Yes 4 No

Post New Answer

More Electrical Engineering Interview Questions

what is corona ?

3 Answers  


Dear All kindly let me know that I know about the DG Rating for Example 150 KVA,Now how i will know that how much Ampher load it can offoard.

2 Answers  


Electricity sometimes can be dangers , sometime got shoked form it . It is because of volatge or Current

6 Answers   Kirloskar,


in science exhibition how lamp can blink when you clap near the lamp ? thank you

0 Answers  


why is a avtomatic voltage regulator used for?

5 Answers  






how many types method in earth testing?

3 Answers   ONGC,


Why generally the transformer primary is connected in star & secondary in delta

7 Answers  


Why the power factor improvement is so important in industrial loads

0 Answers  


What is the concept of voltage & current its relation?

5 Answers  


Earth Resistivity

2 Answers  


Pls mail me utility & Dg related question with answer

0 Answers  


we have two 11/.433 kv. distribution Transformer rating as 1000 kva & 500 kva , i wants to run parallel both transformer. both transformer impendence voltage is 5.24%, How can we run both t/f, & how sharing the load

3 Answers  


Categories
  • Civil Engineering Interview Questions Civil Engineering (5085)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4451)
  • Electrical Engineering Interview Questions Electrical Engineering (16632)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1095)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)