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MCQs

Total Questions : 222 | Page 2 of 23 pages
Question 11. Owing to skin effect
  1.    Current flows through the half cross-section of the conductor
  2.    Portion of the conductor near the surface carries more current and core of the conductor carries less current
  3.    Portion of the conductor near the surface carries less current and core of the conductor carries more current
  4.    Any of the above
 Discuss Question
Answer: Option B. -> Portion of the conductor near the surface carries more current and core of the conductor carries less current
Question 12. The spacing between phase conductors of a 220 kV line is approximately equal to
  1.    2 m
  2.    3.5 m
  3.    6 m
  4.    8.5 m
 Discuss Question
Answer: Option C. -> 6 m
Question 13. The skin effect of a conductor will reduce as the
  1.    Resistivity of conductor material increases
  2.    Permeability of conductor material increases
  3.    Diameter increases
  4.    Frequency increases
 Discuss Question
Answer: Option A. -> Resistivity of conductor material increases
Question 14. Which of the following is the demerit of a 'constant voltage transmission system'?
  1.    Increase of short-circuit current of the system
  2.    Availability of steady voltage at all loads at the line terminals
  3.    Possibility of better protection for the line due to possible use of higher terminal reactants
  4.    Improvement of power factor at times of moderate and heavy loads
 Discuss Question
Answer: Option A. -> Increase of short-circuit current of the system
Question 15. Electromechanical voltage regulators are generally used in
  1.    Reactors
  2.    Generators
  3.    Transformers
  4.    All of the above
 Discuss Question
Answer: Option B. -> Generators
Question 16. 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
 Discuss Question
Answer: Option B. -> Corrodes the material
Question 17. The following system is not generally used
  1.    1-phase 3-wire
  2.    1-phase 4-wire
  3.    3-phase 3-wire
  4.    3-phase 4-wire
 Discuss Question
Answer: Option A. -> 1-phase 3-wire
Question 18. A conductor, due to sag between two supports, takes the form of
  1.    Semicircle
  2.    Triangle
  3.    Ellipse
  4.    Catenary
 Discuss Question
Answer: Option D. -> Catenary
Question 19. The cause of damage to the lead sheath of a cable is
  1.    crystallisation of the lead through vibration
  2.    chemical action on the lead when buried in the earth
  3.    mechanical damage
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 20. The operating voltage of super-tension cables is up to
  1.    3.3 kV
  2.    6.6 kV
  3.    11 kV
  4.    33 kV
 Discuss Question
Answer: Option D. -> 33 kV

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