Transmission & Distribution(Electrical Engineering Questions ) Questions and Answers

Question 1. There is a greater possibility of occurence of corona during______________?
  1.    dry weather
  2.    winter
  3.    summer heat
  4.    humid weather
  5.    none of the above
Explanation:-
Answer: Option D. -> humid weather
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. A 3-phase 4 wire system is commonly used on________________?
  1.    primary transmission
  2.    secondary transmission
  3.    primary distribution
  4.    secondary distribution
Explanation:-
Answer: Option D. -> secondary distribution
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only__________________?
  1.    31.25 percent of copper
  2.    33.3 percent of copper
  3.    66.7 percent of copper
  4.    125 percent of copper
Explanation:-
Answer: Option A. -> 31.25 percent of copper
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. Which of the following is usually not the generating voltage ?
  1.    6.6 kV
  2.    8.8 kV
  3.    11 kV
  4.    13.2 kV
Explanation:-
Answer: Option B. -> 8.8 kV
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. Which of the following materials is used for overhead transmission lines ?
  1.    Steel cored aluminium
  2.    Galvanised steel
  3.    Cadmium copper
  4.    Any of the above
Explanation:-
Answer: Option D. -> Any of the above
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. The presence of ozone due to corona is harmful because it________________?
  1.    reduces power factor
  2.    corrodes the material
  3.    gives odour
  4.    transfer energy to the ground
  5.    none of the above
Explanation:-
Answer: Option B. -> corrodes the material
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. Which of the following is not a constituent for making porcelain insulators ?
  1.    Quartz
  2.    Kaolin
  3.    Felspar
  4.    Silica
Explanation:-
Answer: Option D. -> Silica
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. The power transmitted will be maximum when____________?
  1.    corona losses are minimum
  2.    reactance is high
  3.    sending end voltage is more
  4.    receiving end voltage is more
Explanation:-
Answer: Option A. -> corona losses are minimum
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. A feeder, in a transmission system, feeds power to________________?
  1.    distributors
  2.    generating stations
  3.    service mains
  4.    all of the above
Explanation:-
Answer: Option A. -> distributors
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. For an overhead line, the surge impedance is taken as________________?
  1.    20-30 ohms
  2.    70—80 ohms
  3.    100—200 ohms
  4.    500—1000 ohms
  5.    none of the above
Explanation:-
Answer: Option C. -> 100—200 ohms
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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