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UPPCL AE EE : Power Systems Quiz 2

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Question 1

A suspension type insulator has three units with self-capacitance C and ground capacitance 0.1C. What will be the string efficiency?

Question 2

The value of insulation thickness in cm, if conductor diameter is 2cm, provided

i) Maximum stress in the Dielectric of a single core cable = 40 kV/cm (RMS)

ii) Minimum stress in the dielectric of a single core cable = 10 kV/cm (RMS) will be_____

Question 3

Statement 1 (S1): Oil filled cables are used for higher voltages (66 kV – 400 kV).

Statement 2 (S2): Oil filled cables require relatively smaller amount of insulation as compared to the solid type for same operating voltage.

Question 4

Reel insulator is used with:

Question 5

'Hewlett, cemented cap and core and link' are types of which insulator used for overhead transmission line?

Question 6

Which of the following insulator is practically used for railway crossings?

Question 7

Which one of the following cable is best suited for underground transmission at a voltage of 132 kV?

Question 8

An underground cable is represented as shown below.

Which of the following is true?

Question 9

The dielectric loss in the insulation of a lossy underground cable, due to leakage current is (using standard notations)

Question 10

In a 11 kV, 50 Hz, 3 core cable, the capacitance between any 2 cores with 3^rd core connected to sheath (and sheath is earthed) is 6μF. Charging current per phase is _____.

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