Lakshya Education MCQs

Question: Owing to skin effect
Options:
A.Current flows through the half cross-section of the conductor
B.Portion of the conductor near the surface carries more current and core of the conductor carries less current
C.Portion of the conductor near the surface carries less current and core of the conductor carries more current
D.Any of the above
Answer: Option B

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More Questions on This Topic :

Question 1. 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
Answer: Option C
Question 2. 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
Answer: Option A
Question 3. 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
Answer: Option A
Question 4. Which of the following D.C. distribution system is the simplest and lowest in first cost?
  1.    Radial system
  2.    Ring system
  3.    Interconnected system
  4.    None of the above
Answer: Option A
Question 5. The underground system cannot be operated above
  1.    440 V
  2.    11 V
  3.    33 V
  4.    66 V
Answer: Option D
Question 6. For transmission of power over a distance of 500 km, the transmission voltage should be in the range
  1.    150 to 220 kV
  2.    100 to 120 kV
  3.    60 to 100 kV
  4.    20 to 50 kV
Answer: Option A

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