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1) What is the minimum clearance provided for the 132 kV line from the ground? a. 3.2 m. b. 6.4 m. c. 7.5 m. d. 10.5 m.
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2) What is the horizontal spacing between phase conductors of 132 kV line? a. 8 m. b. 11 m. c. 14 m. d. 17 m.
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3) Which type of insulator is used on 132 kV transmission lines? a. Pin type b. Disc type c. Shackle type d. Pin and shackle type
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4) Where are the strain type insulators used? a. At dead ends b. At any intermediate anchor tower c. On straight runs d. Either (a) or (b)
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5) Porcelain is produced by firing at high temperature due to mixtures of _________. a. Kaolin b. Feldspar c. Quartz d. All of these
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6) What is the dielectric strength of porcelain? a. 55 kV/cm. b. 60 kV/cm. c. 75 kV/cm. d. 80 kV/cm.
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7) Why is the wavy structure of pin insulators used? a. Increases mechanical strength b. Increases puncture strength c. Increases flash over voltage d. Increases thermal strength
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8) The number of discs in a string of insulators for 400 kV ac over head transmission line lies in the range of a. 32 – 33 b. 22 – 23 c. 15 – 16 d. 9 – 10
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9) What is the maximum voltage level upto which the pin type insulators can be used? a. 22 kV b. 33 kV c. 66 kV d. 132 kV
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10) What is the safety factor of an insulator? a. Puncture strength * Flash over voltage b. Puncture strength / Flash over voltage c. Flash over voltage / Puncture strength d. None of these
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11) What is the desirable safety factor prescribed for the pin type of insulators? a. 5 b. 13 c. 10 d. 2
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12) Why is the voltage rating of a multiple shell pin type insulator cannot be increased beyond a limiting value? a. The internal voltage distribution between shells becomes unequal b. The leakage path resistance starts reducing c. The disruptive critical voltage for the material of the insulator is reached d. The puncture voltage of the material of the insulator is reached
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13) What is the main type of distribution system in India? a. Radial b. Parallel c. Network d. All of these
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14) Which component connects the substation to the area where power is to be distributed? a. Distributors b. Service mains c. Feeders d. All of these
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15) Name the cable which connects the distributor to the consumer terminals. a. Distributors b. Service mains c. Feeders d. All of these
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16) What is the permissible limit of voltage variations allowed in the distribution systems? a. ± 2 % b. ± 5 % c. ± 10 % d. ± 6 %
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17) Where the radial systems are generally employed? a. Where power is generated at low voltage b. Where power is generated at high voltage c. Where power is generated at low voltage and substation is located at the centre of the load d. Where power is generated at high voltage and substation is located at the centre of the load
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18) What is the main advantage of ring main system over radial system? i. Voltage drop in the feeder is less. ii. Power factor is higher. iii. Supply is more reliable. Which among the above statements are correct? a. i and ii only b. ii and iii only c. i and iii only d. i, ii and iii
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19) The null point of a uniformly loaded distributor feed at equal voltage at both ends lies at a. Mid point b. Either end c. Two third distance from one end d. One fourth distance from one end
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20) In a distribution system, which of the following items shares the major cost? a. Conductors b. Earthing systems c. Distribution transformer d. Insulators
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