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sruthi

· started a discussion

· 1 Months ago

a (Question: 138645.0 )

How Ns=1000?

Question:

If the full-load speed of a 3-\(\phi\) 50 Hz induction motor is 950 rpm. What is its half-load speed nearly equal to

Options:
A) 1000 rpm 
B) 450 rpm
C) 1900 rpm 
D) 975 rpm
Solution:
Ans: (d) Full load Slip = \(\cfrac{1000-950}{1000}-0.05\)

Hence half load slip = 0.025 

So speed at half load

= (1000 — 1000 x 0.025)= 975 rpm

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