Electrical Engineering - Alternating Current and Voltage - Discussion

Discussion :: Alternating Current and Voltage - General Questions (Q.No.4)

4. 

To produce an 800 Hz sine wave, a four-pole generator must be operated at

[A]. 200 rps
[B]. 400 rps
[C]. 800 rps
[D]. 1,600 rps

Answer: Option B

Explanation:

No answer description available for this question.

Vinay said: (Apr 15, 2011)  
BY USING FORMULA, n=120f/P
=120*800/4
=24000 rpm
=24000/60 rps
n=400 rps

Saran said: (Aug 20, 2011)  
N=120f/p
N=(120*800)/4=24000 rpm

Speed in rps = 24000/60 = 400rps

Abhishek Tiwari said: (Oct 8, 2011)  
N=2*f/p(in rps)
so, N=2*800/4
N=400 rps

Santosh said: (Apr 6, 2012)  
N=RPM*pole/120
800=RPM*4/120
RPM=800*120/4
so RPM=24000
RPS=24000/60
RPS=400

Swapnil said: (Jun 23, 2012)  
N=120F/P.

N=120*800/4.

N=24000.

To convert it into rps.

24000/60 = 400.

Sai said: (Sep 30, 2013)  
N = 120f/p.

= 120*800/4.

= 120*200.

= 24000 rpm.

= 24000/60 rps.

= 400.

Akshaya said: (Dec 29, 2013)  
Every engineer has different creative. It is shown here.

You said: (Feb 22, 2014)  
All showed same formula but differed in arrangement.

Dino said: (Feb 27, 2014)  
Frequency = No of poles x Revolution Rate.
f = (2 * 400 rps).
f = 800 hz.

Asha.Rrrrr said: (Apr 27, 2014)  
What is the 60 here?

Ashok Gavel said: (Jun 7, 2014)  
N = 2F/P rps.

N = (2x800)/4.

N = 400 rps.

Rafiqul Islam said: (Sep 30, 2014)  
N=?
Given data,
P=4.
f= 800Hz.

We know,
N= 120 f/P RPM.

=> N= 120*800/4.
=> N= 24000rpm.
=> N= 24000/60 rps.

Therefore N= 400rps.

Gurupriya said: (Dec 7, 2014)  
Please give clear formula. And what is rps?

Name said: (Dec 24, 2014)  
All formula shown by our friends are clear as crystal. RPS means Revolutions Per Second.

Tukuna said: (Aug 1, 2015)  
F = (PN)%120, where f in Hz, N in rpm.

Given f = 800Hz, P = 4.

By applying formula:

800Hz = (4*N)% 120.

=> N = 24000 rpm.

=> N = 24000% 60 = 400 rps.

Shameek Mohamed said: (Oct 25, 2015)  
N = 2*(f/p); speed in rps.

N = 2*(800/4)†\'2*200 = 400.

Nsabimana Ibrahiim said: (Oct 29, 2015)  
Given data:

F = 800 Hz p = 4 poles = 4/2 = 2 pair of poles.

Then Ns = 120*800/4 = 24000 rpm means that you can also use pair of pole using the following formula Ns = 60*800/2 = 24000 rpm you can convert rpm in rps like this 24000/60 = 400.

Thank you.

Naeem Rind said: (Dec 26, 2015)  
1 RPS = 60 RPM.

And 1 RPM = 1/60 RPS or 0.1666 RPS.

The standard unit is RPM, but we have to convert it into RPS for this question.

Gaju said: (Feb 16, 2016)  
N = 120f/p.

= 120*800/4 = 96000/4.

= 24000 rpm.

Then in RPS:

= 24000/60 = 400rps.

Mickomkv said: (Jul 24, 2016)  
What is 120! ? Thanks in advance!

Sachin Sharma said: (Jul 29, 2016)  
Same calculate Rpm than calculate Rps N = 120f/p = rpm/60 for convert rps.

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