A two conductor 1-phase line operates at 50 Hz. The diameter of each conductor is 4 cm and is spaced 6 m apart. What is the capacitive susceptance to neutral per km

1.  1.42x10-9 s/km       

2.   3.25x10-8 s/km         

3.    4.8x10-9 s/km      

4.      3.06x10-9 s/km

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4
Correct Answer :

    3.06x10-9 s/km


Explanation :
No Explanation available for this question

A three phase 50 Hz line consists of three conductors each of diameter 21 mm. The spacing between the conductors as follows: A-B=3m,B-C=5m, C-A=3.6m. If the line operates at 132 KV, the reactive voltampere generated by the line per km is    

1.  51.07 kVAr           

2.    51.70 kVAr     

3.      40.0 kVAr       

4.   60.5 kVAr        

View Answer  
4
Correct Answer :

  51.70 kVAr     


Explanation :
No Explanation available for this question

A two conductor 1- phase line operates at 50 Hz. The diameter of each conductor is 20 mm and the spacing between the conductors is 3m. The height of conductor above the ground is 6m. The capacitance of the line to neutral will be  

1.  9.7 pF/m           

2.     10.2 pF/m             

3.    8.7µF/m       

4.    2.4 µF/m

View Answer  
4
Correct Answer :

9.7 pF/m           


Explanation :
No Explanation available for this question

A three phase line has conductor of 5mm diameter placed at the corner of an equilateral triangle of 1.5 m side. The capacitive reactance to neutral per phase per km wil be  

1.  1.25x106 Ω/km     

2.  8.68x105Ω/km         

3.  4.25 mΩ/km    

4.   3.66x105 Ω/km

View Answer  
4
Correct Answer :

 3.66x105 Ω/km


Explanation :
No Explanation available for this question

A 5 KVA,400/2000 volt, 50 Hz, 1-phase transformer has primary and secondary leakage reactance each of 2.5 Ω. The total reactance in p.u will be  

1.  0.86 p.u        

2.   0.390 p.u        

3.   0.460p.u     

4.    0.125 p.u

View Answer  
4
Correct Answer :

 0.390 p.u        


Explanation :
No Explanation available for this question

A three phase synchronous generator delivers 10 mvA, at a voltage of 10.5 kV. The line impedance is 5 Ω. What is the voltage drop in the line in per unit and in volts Use the reference base as 12mVA at 11 kV.

1.  549.26A,1.25kV

2.  539.46A,2.81 kV

3.  549.36A, 2746.8kV

4.  549.36A,2.0kV

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4
Correct Answer :

549.36A, 2746.8kV


Explanation :
No Explanation available for this question

A single phase load of 200 kVA, is delivered at 2500 V over a transmission line having a R=1.4Ω, X=0.8  Ω. What is the voltage at the sending end, when the power factor of the load is 0.8 lagging

1.  2.627 kV

2.  2.069 kV

3.  2.840 kV

4.  3.54 kV

View Answer  
4
Correct Answer :

2.627 kV


Explanation :
No Explanation available for this question

A 1-phase load of 200kVA is delivered at 2500 V over a transmission line having R=1.4 Ω, X=0.8 Ω. What is the power at the sending end when the power factor of the load is 0.8 leading  

1.  0.8 leading  

2.  0.82 leading  

3.  0.82 lagging  

4.  0.6 lagging

View Answer  
4
Correct Answer :

0.82 leading

 


Explanation :
No Explanation available for this question

A three phase line, 20 km long, delivers 10 MW at 11 kV, 50 Hz, 0.8 power factor lagging. The power losses in the line is 10 percent of the power delivered. The resistance of the each conductor will be

1.  0.86 Ω   

2.  1.54Ω               

3.    2.14Ω        

4.  0.774Ω

View Answer  
4
Correct Answer :

0.774Ω


Explanation :
No Explanation available for this question

What is the overall diameter of a single core cable when its working on a three phase 264kV system The maximum permissible stress in the dielectric is not to exceed 20kV/mm    

1.  21.4 mm         

2.    24.4 mm        

3.  22.4 mm          

4.    28.2mm

View Answer  
4
Correct Answer :

21.4 mm         


Explanation :
No Explanation available for this question
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