Monday, 30 April 2018

List The Method For Testing DC Machine!??

List The Method For Testing DC Machine!??




There Are Three Method For Testing of DC Machines And Check The Efficiency Of The Electrical DC Machines  And Get All Rates Of All Properties Of The DC Machines ! 

Three Method in Testing of DC machine


The Methods for Testing Of DC Machines can be broadly classified into three methods:




  • 1) Direct method
  • 2) Indirect method
  • 3)Regenerativo method



(1)Direct method





In this Method Of Testing, the DC machine is loaded directly by means of Mechanical Brake coupled to the shaft of the machine.


  • The efficiency of the machine is cnlculated directly by measuring the power input and output. 

  • The entire power output is wasted at the mechanical brake. 


Due to non-availability of large capacity loads for testing large machines in the laboratories, this method is used only for testing small DC machines.


Brake Test is the example of direct test.




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(2) Indirect method




In this method of testing, the losses [ Here Totle Losses In DC Machines Fully Explanation  ]  are determined without actual loading of the machine.

If the Total Losses in the machine are known, the efficiency can be calculated.

The Swinburne's test is the simplest indirect testing method for finding out the efficiency of dc machine.


(3)Regenerative method 





This method requires two identical dc machines.

One of the machines  is operated as a Motor And Drives the other machine as a generator Both the machines are mechanically coupled and electrically connected.

The electrical output of the generator is feedback into the supply. the power drawn from the supply is small only to overcome the losses of the two machines.


Hence the Large Machines can be tested at rated load without consuming much power from the supply The Hopkinson's test is a regenerative method of testing for dc machines.




Question part Related To This Article :


1)how manny and which  test for dc machine?? 
Ans:1) Direct method
2) Indirect method
3)Regenerativo method



2)what is direct test?? 
Ans: In this method of testing, the de machine is loaded directly by means of mechanical brake coupled to the shaft of the machine.

The efficiency of the machine is cnlculated directly by measuring the power input and output.

The entire power output is wasted at the mechanical brake. Due to non-availability of large capacity loads for testing large machines in the laboratories, this method is used only for testing small de machines.



3)break test is example of which test?? 
Ans:direct test


4)Swinburn's test is simplest which type of test?? 
Ans: Indirect


5)what is indirect test?? 
Ans:In this method of testing, the losses are determined without actual loading of the machine.

If the total losses in the machine are known, the efficiency can be calculated.


6)give one example of regenerative test of dc machine?? 
Ans: hopkinson's test



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