[amp_mcq option1=”Radial system” option2=”Ring system” option3=”distribution system is the simplest and lowest in first cost? A. Radial system B. Ring system C. Interconnected system” option4=”None of the above” correct=”option1″]
Transmission and distribution
12. Which of the following faults is most likely to occur in cables?
[amp_mcq option1=”Cross or short-circuit fault” option2=”Open circuit fault” option3=”Breakdown of cable insulation” option4=”All of the above” correct=”option1″]
Detailed SolutionWhich of the following faults is most likely to occur in cables?
13. The operating voltage of extra high tension cables is upto
[amp_mcq option1=”6.6 kV” option2=”11 kV” option3=”33 kV” option4=”66 kV” correct=”option3″]
Detailed SolutionThe operating voltage of extra high tension cables is upto
14. The usual spans with R.C.C. poles are
[amp_mcq option1=”40-50 meters” option2=”60-100 meters” option3=”poles are A. 40-50 meters B. 60-100 meters C. 80-100 meters” option4=”300-500 meters” correct=”option2″]
15. Skin effect is proportional to
[amp_mcq option1=”$${\left( {{\text{conductor diameter}}} \right)^{\frac{1}{2}}}$$” option2=”(conductor diameter)4″ option3=”(conductor diameter)2″ option4=”(conductor diameter)3 E. none of the above” correct=”option1″]
16. The presence of ozone due to corona is harmful because it
[amp_mcq option1=”Reduces power factor” option2=”Corrodes the material” option3=”Gives odour” option4=”Transfer energy to the ground” correct=”option2″]
Detailed SolutionThe presence of ozone due to corona is harmful because it
17. High voltage transmission lines use
[amp_mcq option1=”Suspension insulators” option2=”Pin insulators” option3=”Both (A) and (B)” option4=”None of the above” correct=”option3″]
18. The wooden poles well impregnated with creosote oil or any preservative compound has life
[amp_mcq option1=”From 2 to 5 years” option2=”10 to 15 years” option3=”25 to 30 years” option4=”60 to 70 years” correct=”option3″]
19. The material commonly used for insulation in high voltage cables is
[amp_mcq option1=”Lead” option2=”Paper” option3=”Rubber” option4=”None of the above” correct=”option3″]
Detailed SolutionThe material commonly used for insulation in high voltage cables is
20. The material generally used for armour of high voltage cables is
[amp_mcq option1=”Aluminium” option2=”Steel” option3=”Brass” option4=”Copper” correct=”option1″]
Detailed SolutionThe material generally used for armour of high voltage cables is