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A commutator with a diameter of 50 cm rotates at 1000 rpm. For a brush width of 1.5 cm, the time of commutation is 
  • a)
    573 μsec
  • b)
    256 msec
  • c)
    625 μsec
  • d)
    448 msec
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A commutator with a diameter of 50 cm rotates at 1000 rpm. For a brush...
Peripheral velocity of commutator is 

Now, brush width = v x time of commutation
or, time of commutation
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Most Upvoted Answer
A commutator with a diameter of 50 cm rotates at 1000 rpm. For a brush...
We can start by finding the circumference of the commutator:

C = πd
C = 3.14 x 50
C = 157 cm

Next, we can find the distance that the brush travels during one rotation of the commutator:

distance = brush width x number of rotations
distance = 1.5 x 1000
distance = 1500 cm

Now we can find the time of commutation:

time = distance / speed
time = 1500 / 157
time ≈ 9.55 seconds

So the time of commutation is approximately 9.55 seconds.
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Community Answer
A commutator with a diameter of 50 cm rotates at 1000 rpm. For a brush...
Time of communication= (width of brush)/velocity
velocity= πDN/60
D = diameter of commutator
N=speed
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A commutator with a diameter of 50 cm rotates at 1000 rpm. For a brush width of 1.5 cm, the time of commutation isa)573μsecb)256 msecc)625 μsecd)448 msecCorrect answer is option 'A'. Can you explain this answer?
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