Overhead transmissions line generally use

On which of the following factors skin effect depends?

Which of the following materials is not for transmission and distribution of electrical power?

Name the effect which resulted because of the size of conductor frequency and the specific resistance of the conducting material

In both skin effect and proximity effect

What is the recommended horizontal spacing of three phase conductors for a 34.5 kV transmission line?

What is the GMR six strands conductor with pyramid formation in terms of r of individual strand?

A 115 kV line has a horizontal configuration. The distance between adjacent conductor is 9 ft. What is the geometric mean distance of the line?

A single line distribution linebis installed with two No. 8 conductors spaced 15 cm. The line is 4 km long and the GMR with No 8 is 1.27 x 10^-3 m. What is the inductance with the line?

A three phase 60 Hz transposed transmission line has a flat horizontal spacing configuration. The line reactance is 0.486 ohm per km. The conductor geomtric mean radius is 2.0 cm. Determine the spacing D in meter.

A 115 kV double circuit 3 phase transmission lien composed of 336.4 MCM ACSR with GMR of 0.0244 ft has a horizontal spacing of 18 ft and a conductor verticsm spacing of 9.0 ft. Calculate the GMR of the parallel lines

In transmission lines the cross arms are made of

Transmission line insulators are made of

The use of strain type insulators is made where the conductor are

Which of thw following type of fault that used only the equivalent positive impedance of the circuit short circuit calculation?

In a certain analyses the bases chosen are 69 kV and 100 mVA What is the impedance base?

The percent impedance of a line is 6% at 34.5 kV and 100 MVA base. What is the ohmic impedance?

The impedance of a line is 5% on 115 kV and 100 MVA bases. What shall be at 120 kV and 10,000 kVA bases?

A 69kV/13.4 kV, 75 MVA transformer has 8% impedance. What is its impedance at base 100 MVA and 66 kV?

A 50 MVA, 33 kV/11kV, three phase wye delta connected transformer has a 3% impedance. what is the per cent impedance at 100 MVA and 34.5 kV bases?

The available fault duty of a certain point of electrical system is 950 MVA at 230 kV. Thevenin's equivalent impedance is 2.63%, What is the available fault current?

At certain location in an electric system, the available fault MVA is 400 MVA, a 15 MVA, 34.4 kV/6.24 kV, 2.5% impedance wye wye geounded transformer is installed at that location. Determine the shirt cirxuit MVA at the secondary.

For which of the following equipment current rating is not neccesary?

A ciruit is disconnected by isolators when

Earthing is neccesary to give protection against

A device which monitor and operstes when certain level has been reached?

It is a protective relay which compares the sum of incomming currents against the sum of the outgoing currentm it operates when there is unbalance?

The distribution system is 34.5 kV ungrounded, which arrester shall be installed to protect a distribution transformer

What is the relay that can detect overload in the line?

The basic function of a circuit breaker is to

What is the IEEE standard device number for Overvoltage Relay?

What is the IEEE standard device number of Circuit breaker?

In transmission lines the most effective protection against lighting strikes is one of the following. Which one this?

It is computerized data gathering monitoring and switching equipment

Two bus system has Z11 = j0.11565 pu, Z12=Z21=j0.04580 and Z22=j0.13893 pum If can impedance Zb=j0.4 pu is connected between buses 1 and 2. Find the new value of Z11

Two port network consist of Z11=Z22=j0?16 and Z12=Z21=j0.06 ohm. Find the new Z33 wheb Zb=0.34 ohm is connected from bus 2 to new bus 3

For Y bus systen shown find Y22

The material generally used for ammour of high voltage cables is

Which of the following busbar schemes has the lowest cost?

Which of the following bar schemes is the most expencive