Lakshya Education MCQs

Question: The following system is not generally used
Options:
A.1-phase 3-wire
B.1-phase 4-wire
C.3-phase 3-wire
D.3-phase 4-wire
Answer: Option A

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More Questions on This Topic :

Question 1. A conductor, due to sag between two supports, takes the form of
  1.    Semicircle
  2.    Triangle
  3.    Ellipse
  4.    Catenary
Answer: Option D
Question 2. 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
Answer: Option D
Question 3. The operating voltage of super-tension cables is up to
  1.    3.3 kV
  2.    6.6 kV
  3.    11 kV
  4.    33 kV
Answer: Option D
Question 4. 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
Answer: Option B
Question 5. Electromechanical voltage regulators are generally used in
  1.    Reactors
  2.    Generators
  3.    Transformers
  4.    All of the above
Answer: Option B
Question 6. 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

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