Electrical Studys

1➤ By which of the following systems electric power may be transmitted ?

A. Overhead systemB. Underground systemC. Both (a) and (b)D. None of the above

2➤ are the conductors, which connect the consumer's terminals to the distribution

A. DistributorsB. Service mainsC. FeedersD. None of the above

3➤ The underground system cannot be operated above

A. 440 VB. 11 kvC. 33 kv D. 66 kv

4➤ Overhead system can be designed for operation upto

A. 11 kv B. 33 kv C. 66 kv D. 400 kv

5➤ If 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

A. Kelvin's lawB. Ohm's lawC. Kirchhoffs lawD. Faraday's law

6➤ The wooden poles well impregnated with creosite oil or any preservative compound have life

A. from 2 to 5 yearsB. 10 to 15 yearsC. 25 to 30 yearsD. 60 to 70 years

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

A. CopperB. AluminiumC. SteelD. Tungsten

8➤ Galvanised steel wire is generally used as

A. stay wireB. earth wireC. structural componentsD. all of the above

9➤ The usual spans with R.C.C. poles are

A. 40—50 metresB. 60—100 metresC. 80—100 metresD. 300—500 metres

10➤ The corona is considerably affected by which of the following ?

A. Size of the conductorB. Shape of the conductorC. Surface condition of the conductorD. All of the above

11➤ Which of the following are the constants of the transmission lines ?

A. ResistanceB. InductanceC. CapacitanceD. All of the above

12➤ 310 km line is considered as

A. a long lineB. a medium lineC. a short lineD. any of the above

13➤ The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the

A. Seeback effectB. Ferranti effectC. Raman effectD. none of the above

14➤ The square root of the ratio of line impedance and shunt admittance is called the

A. surge impedance of the lineB. conductance of the lineC. regulation of the lineD. none of the above

15➤ Which of the following is the demerit of a 'constant voltage transmission system' ?

A. Increase of short-circuit current of the systemB. Availability of steady voltage at all loads at the line terminalsC. Possibility of better protection for the line due to possible use of higher terminal reactancesD. Improvement of power factor at times of moderate and heavy loads

16➤ The operating voltage of high voltage cables is upto

A. 1.1 kv B. 3.3 kvC. 6.6 kv D. 11 kv

17➤ The operating voltage of supertension cables is upto

A. 3.3 kv B. 6.6 kv C. 11 kv D. 33 kv

18➤ The operating voltage of extra high tension cables is upto

A. 6.6 kv B. 11 kv C. 33 kv D. 66 kv

19➤ Which of the following methods is used for laying of underground cables ?

A. Direct layingB. Draw-in-systemC. Solid systemD. All of the above

20➤ Which of the following is the source of heat generation in the cables ?

A. Dielectric losses in cable insulationB. losses in the conductorC. Losses in the metallic sheathings and armouringD. All of the above

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