Electrical Engineering - Magnetism and Electromagnetism - Discussion
Discussion Forum : Magnetism and Electromagnetism - General Questions (Q.No. 12)
12.
A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?
Discussion:
13 comments Page 1 of 2.
Makwazir said:
1 decade ago
In one sec it will reach at 180 peak, once is for +ve peak(90) and another is -ve peak 90. So answer is 180.
Naresh said:
1 decade ago
What is the meaning of one loop ?
Pasupathi said:
1 decade ago
One loop represents one full cycle. i.e 0 to 180 degrees. In one second, it will reach positive max and negative max. i.e. 2 times. therefore, 90 rev/s corresponds to 180 times.
Silambu said:
1 decade ago
Here taking 2 cycles per 1 revolution in one loop generator.
So, 90 rev = 2*90 =180.
Now 180 times will reach the maximum peak value.
So, 90 rev = 2*90 =180.
Now 180 times will reach the maximum peak value.
Ra chaudhari said:
1 decade ago
1 cycle is completed in 1 revolution. And in one cycle it obtains two times max value. Therefore 2*90 = 180 times.
(1)
Jumper said:
1 decade ago
Guys it has been mentioned that its DC. So only +ve peak twice in one cycle.
Satieins said:
1 decade ago
F = NP/120.
Basic one loop generator has two pole.
N = 90*60 rpm.
F = 5400*2/120 = 90.
Answer is 90*2 = 180.
Basic one loop generator has two pole.
N = 90*60 rpm.
F = 5400*2/120 = 90.
Answer is 90*2 = 180.
(1)
Raj said:
1 decade ago
What is F?
Raki said:
1 decade ago
F is frequency and what is that 2?
PradeepRaj said:
1 decade ago
It is given 90 REV/sec. So frequency is 90 Hz (i.e 90 complete cycles).
It has 90 +ve half cycles and 90 -ve half cycles.
Since it is DC generator, due to action of commutators (split rings) and carbon brush the -ve half cycles are rectified into +ve half cycles.
So in total, it got 180 peaks.
Happy learning.
It has 90 +ve half cycles and 90 -ve half cycles.
Since it is DC generator, due to action of commutators (split rings) and carbon brush the -ve half cycles are rectified into +ve half cycles.
So in total, it got 180 peaks.
Happy learning.
(4)
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