Transmission and distribution

[amp_mcq option1=”Low cost” option2=”High mechanical strength” option3=”Longer life” option4=”All of the above” correct=”option4″]

Detailed SolutionWhich of the following characteristics should the line supports for transmission lines possess?

[amp_mcq option1=”Impedance relay” option2=”Mho’s relay” option3=”Reactance relay” option4=”None of the above” correct=”option1″]

Detailed SolutionWhich of the following relays is used on long transmission lines?

[amp_mcq option1=”Copper” option2=”Wood” option3=”R.C.C.” option4=”Steel” correct=”option4″]

Detailed SolutionIn transmission lines the cross-arms are made of

[amp_mcq option1=”The oil may loose its viscosity and it may start drawing off from higher levels” option2=”Expansion of the oil may cause the sheath to burst” option3=”Unequal expansion may create voids in the insulation which will lead to ionization” option4=”All of the above” correct=”option4″]

Detailed SolutionDue to which of the following reasons the cables should not be operated too hot?

[amp_mcq option1=”Balanced” option2=”Unbalanced” option3=”Either of the above” option4=”None of the above” correct=”option3″]

Detailed SolutionThe loads on distributors systems are generally

[amp_mcq option1=”Kelvin’s law” option2=”Ohm’s law” option3=”Kirchhoff’s law” option4=”Faraday’s law” correct=”option1″]

Detailed SolutionIf variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as

[amp_mcq option1=”Single phase” option2=”Three-phase three wire” option3=”Three-phase four wire” option4=”None of the above” correct=”option1″]

Detailed SolutionThe distributors for residential areas are

[amp_mcq option1=”Exciters” option2=”Series capacitors” option3=”Shunt reactors” option4=”Voltaire transformers” correct=”option4″]

Detailed SolutionIn a substation the following equipment is not installed

[amp_mcq option1=”Copper conductors” option2=”All aluminium conductors” option3=”A.C.S.R. conductors” option4=”None of these” correct=”option1″]

Detailed SolutionOverhead lines generally use

[amp_mcq option1=”1.5″ option2=”2.7″ option3=”4.2″ option4=”7.8″ correct=”option2″]

Detailed SolutionAluminium has a specific gravity of