# In a string of suspension insulators, the voltage distribution across the different units of a string could be made uniform by the use of a grading ring, because it

1.  Forms capacitances with link-pins to carry the charging current from link pins

2.  Forms capacitances which help to cancel the charging current from link pins

3.   increases the capacitances of lower insulator units of cause equal voltage drop

4.  Decreases the capacitances of upper insulators units to cause equal voltage drop

4

Forms capacitances which help to cancel the charging current from link pins

Explanation :
No Explanation available for this question

# A three phase over head transmission line has its conductors horizontally spaced with spacing between adjacent conductors equal to ‘d’. If now the conductors of the line are rearranged to form an equilateral triangle of sides equal to d, then

1.  Average capacitance and inductance will increase

2.  Average capacitance will decrease and inductance will increase

3.  Average capacitance will increase and inductance will decrease

4

Average capacitance and inductance will increase

Explanation :
No Explanation available for this question

# For a 500Hz frequency excitation, a 50 km long power line will be modeled as

1.  Short line

2.  medium line

3.  long line

4.   data insufficiency for decision

4

long line

Explanation :
No Explanation available for this question

# If a short transmission line , resistance and inductance are found to be equal and regulation appears to be zero, then the load will

1.  Have unity power factor

2.   have zero power factor

4

Explanation :
No Explanation available for this question

# If within  an untransposed 3-phase circuit of a transmission line, the series impedance of each of the conductors is considered, it is found to contain resistive terms of the form K loge(d12/d13)  K being a constant and d12 and d13 etc, being space between the conductors. These terms represent power transfer from one phase to another. The sum of these terms over the three phases is

1.  Three times the average

2.  √3 times the average

3.  one-third the average

4.   zero

4

zero

Explanation :
No Explanation available for this question

# “Expanded ACSR” are conductors composed of

1.  Larger diameter individual strands for a given cross-section of the aluminum strands

2.  Larger diameter of a central steel stands for a given overall diameter of the conductor

3.  Larger diameter of the aluminum strands only for a given overall diameter of the conductor

4.  A filter between the inner steel and the outer aluminum strands to increase the overall diameter of the conductor

4

A filter between the inner steel and the outer aluminum strands to increase the overall diameter of the conductor

Explanation :
No Explanation available for this question

# What is the sag for a span of 400m, if the ultimate tensile strength of conductor is 6000kgf, and the weight of conductor is 550 kgf /km Factor of safety is 2.

1.  1.016 m

2.   2.40 m

3.   3.6 m

4.  4.2 m

4

3.6 m

Explanation :
No Explanation available for this question

# A transmission line has a span of 275 m between level supports. The conductor has a diameter of 19.53 mm., weight 0.844 kgf/m and has an ultimate breaking strength of 7950 kgf.  Each conductor has a radial covering of ice 9.53 mm thick and is subjected to a horizontal wind pressure of 40 kgf/m2 of ice covering projected area. If the factor of safety is 2, what is the deflected sag Ice weight is 913.5 kgf/m3

1.  5.36 m

2.   4.1 m

3.    3.9 m

4.  3.01 m

4

5.36 m

Explanation :
No Explanation available for this question

# A transmission line conductor at a river crossing is supported from two towers at heights of 30 m and 90 m above water level. The horizontal distance between towers is 270 m, if tension in the conductor is 1800 kg and conductor weight 1 kg/m. What is the clearance between conductor and the water at a point midway between the towers

1.  79.50 m

2.   54.94 m

3.  60 m

4.       51.4 m

4

54.94 m

Explanation :
No Explanation available for this question

# An overhead transmission line has a span of 240 m between level supports. What is the maximum sag if conductor weight 727 kg/km and has a breaking strength of 6880 kg Allow the factor of safety of 2 and neglect wind and ice loading.

1.  1.52 m

2.     1.6 m

3.  0.75 m

4.  1.25 m

4