The line conductor of a transmission line has an overall diameter of 19.53 mm, weight 0.844 kg/m and an ultimate breaking strength of 7950 kg. If factor of safety is to be 2, when conductor has an ice of 1 kg/m and a horizontal wind pressure of 1.5 kg/m. What is the vertical sag, corresponding to this loading for a 300 m span level supports    

1.  1.08 m                

2.     5.0 m        

3.         5.22 m         

4.      4.62 m

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4
Correct Answer :

       5.22 m         


Explanation :
No Explanation available for this question

A two conductor 1- line operates at 50 Hz. The diameter of each conductor is 20 mm and spacing between conductors is 3 m. What is the inductance of each conductor per km ?

1.  1.19 mH/km                  

2.    1.24 mH/km           

3.    2.38 mH/km       

4.      0.59 mH/km

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4
Correct Answer :

1.19 mH/km                  



Explanation :
No Explanation available for this question

A two conductor 1- line operates at 50 Hz. The diameter of each conductor is 20 mm and spacing between conductor is 3 m. When conductor material is steel of relative permeability 50, then loop inductance per km of the line will be    

1.  8.2 mH/km        

2.   7.281 mH/km          

3.  5.0 mH/km         

4.    2 mH/km

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4
Correct Answer :

 7.281 mH/km          


Explanation :
No Explanation available for this question

A 3-phase 50 Hz transmission line has the following constant (line to neutral) : Resisitance = 10 ohms Inductive reactance = 20 ohms Capacitive susceptance = 4 ×10-4 mhos The inductance of the arc suppressor coil to be used in the system is

1.  0.06368 H          

2.    0.127 H            

3.    1.274 H          

4.  2.590 H

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4
Correct Answer :

2.590 H


Explanation :
No Explanation available for this question

A conductor is composed of seven identical copper strands, each having a radius r. The self GMD of the conductors will be    

1.  2.177 r                

2.   2.645 r          

3.     2.141 r        

4.   1.21 r

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4
Correct Answer :

2.177 r                


Explanation :
No Explanation available for this question

What is the capacitance of neutral/km of a 1- phase line composed of number 2 single strand conductor radius is 0.328 cm, spaced 3 m apart and 7.5 m above the ground ? Neglecting earth effect.

1.  0.817 µF/km     

2.   0.00817 µF/km      

3.    0.0212 µF/km   

4.     0.516 µF/km

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4
Correct Answer :

 0.00817 µF/km      


Explanation :
No Explanation available for this question

What is the charging current per km, when the transmission line is operating at 264 kV

1.  0.312 A/km   

2.   0.257 A/km        

3.  0.4272 A/km      

4.    0.2136  A/km

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4
Correct Answer :

0.4272 A/km      


Explanation :
No Explanation available for this question

A 3-phase load of 750 kW at 400 V, 50 Hz, operates at a power factor of 0.7 lagging. What is the capacitance per phase of a mesh connected capacitor bank to improve the power factor  to 0.95 lagging  

1.  3040 µF          

2.    2500 µF      

3.    3438 µF       

4.    2789 µF

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4
Correct Answer :

  3438 µF       


Explanation :
No Explanation available for this question

What is the time of operation of  a relay of rating 5 amp 2.2 sec, IDMT and having a relay setting of 125 % Tms=0.6 It is connecterd to a supply circuit through a CT, 400 ratio. The fault current is 4000amp.

1.  10.0 sec            

2.      1.92 sec           

3.    4.5 sec             

4.       2.4 sec

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4
Correct Answer :

    1.92 sec           


Explanation :
No Explanation available for this question

A two conductor 1-phase line operates at 50 Hz. The diameter of each conductor is 2 cm and is spaced 3 m apart. What is the line to line capacitance  

1.  9.74 × 10-9 F/km         

2.    4.87 × 10-9 F/km        

3.      3.05 × 10-9 F/km     

4.       None of these

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4
Correct Answer :

  4.87 × 10-9 F/km        


Explanation :
No Explanation available for this question
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