GATE 2020 || Power Systems || Quiz 2

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Question 1

The corona loss on a particular system at 50 Hz is 2 KW/km/ph. The corona loss at 60 Hz would be ________ KW/km/ph.

• A2.26
• B3.12
• C4.11
• D5.24

Question 2

In a 3 φ unsymmetrical transmission system the distance between conductors ab, bc and ca is 3 m, 4 m and 5 m respectively. The radius of each conductor is 2 cm. The capacitance of each phase is _________ pF/m.

• A10.53
• B12.56
• C14.75
• D18.80

Question 3

A conductor consists of seven identical strands each having a radius of r as shown below. Determine the factor by which r should be multiplied to obtain the self GMD of entire conductor?

• A2.176r
• B2.432r
• C3.124r
• D3.462r

Question 4

An insulator string consists of four insulators. The voltage drop across the units starting from the cross arm towards the power conductor is 4.36 kV, 8.52 kV, 13.68 kV and 17.44 kV respectively. Determine the string efficiency.

• A39%
• B51%
• C63%
• D80%

Question 5

A composite conductor consists of three conductors of radius R each. The conductors are arranged as shown below. The geometric mean radius (GMR) (in cm) of the composite conductor is kR. The value of k is ______.

• A1.856
• B1.913
• C1.685
• DNone of these

Question 6

A single core cable 5 km long has an insulation resistance of 0.4 MΩ. The core diameter is 20 mm and the diameter of the cable over the insulation is 50 mm. The resistivity of the insulating material is

• A0.45 G Ω-m
• B1.12 G Ω-m
• C0.97 G Ω-m
• D13.7 G Ω-m

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