# The conductors of a 10 km long, single phase, two wire line are separated by a distance of 1.5m. The diameter of each conductor is 1 cm. If the conductors are of copper, the inductance of the circuit is

1.  50.0 mH

2.  45.3 mH

3.  23.8 mH

4.   19.6 mH

4

23.8 mH

Explanation :
No Explanation available for this question

# For a single phase overhead line having solid copper conductors of diameter 1 cm, spaced 60 cm between centers, the inductance in mH/km is

1.  0.05+0.2 ln 60

2.   0.2 ln 60

3.   0.05+0.2 ln(60.0.5)

4.   0.2 ln(60/0.5)

4

0.05+0.2 ln(60.0.5)

Explanation :
No Explanation available for this question

# A 100 km long transmission line is loaded at 110KV. If the loass of line is 5 MW and the load is 150 MVA, the resistance of the line is

1.  8.06 ohms per phase

2.    0.806 ohms per phase

3.  0.0806 ohms per phase

4.   80.6 ohms per phase

4

8.06 ohms per phase

Explanation :
No Explanation available for this question

# For equilateral spacing of conductors of an untransposed 3-phase line, we have

1.  Balanced receiving end voltage, and no communication interference

2.  Un Balanced receiving end voltage, and no communication interference

3.  Balanced receiving end voltage, and communication interference

4.  Un Balanced receiving end voltage, and communication interference

4

Balanced receiving end voltage, and communication interference

Explanation :
No Explanation available for this question

# Which one of the following statements is not correct for the use of bundled conductors in transmission lines

2.  Reduction in Corona loss

4.  Increase in interference with communication lines

4

Increase in interference with communication lines

Explanation :
No Explanation available for this question

# A single phase transmission line of impedance j0.8 ohm supplies a resistive load of 500 A at 300 V. The sending end power factor is

1.  Unity

2.   0.8 lagging

4.   0.6 lagging

4

0.6 lagging

Explanation :
No Explanation available for this question

# A medium line with parameters A, B, C, D is extended by connecting a short line of impedance Z in series. The overall ABCD parameters of the series combination will be

1.  A, AZ, C+D/Z, D

2.   A,AZ+B,C,CZ+D

3.  A+BZ,B,C+DZ,D

4.  AZ,B,C/Z,D

4

A,AZ+B,C,CZ+D

Explanation :
No Explanation available for this question

# When bundle conductors are used in place of single conductors, the effective inductance and capacitance will respectively

1.  Increase and decrease

2.   decrease and increase

3.  decrease and remain unaffected

4.   remain unaffected and increase

4

decrease and increase

Explanation :
No Explanation available for this question

# To increase the visual critical voltage of corona for an overhead line, one solid phase conductor replaced by a “bundle” of four smaller conductors per phase, having an aggregate cross-sectional area equal to that of the solid conductor. If the radius of the solid conductor is 40 mm, then the radius of each of the bundle conductors would be

1.  10 mm

2.    20 mm

3.     28.2 mm

4.  30 mm

4

20 mm

Explanation :
No Explanation available for this question

# For an existing ac transmission line, the string efficiency is 80%, if dc voltage is supplied for the same set up, the string efficiency will be

1.

2.   80%

3.    90%

4.    100%

4