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MCQs

Total Questions : 222 | Page 10 of 23 pages
Question 91. The usual spans with R.C.C. poles are
  1.    40-50 meters
  2.    60-100 meters
  3.    80-100 meters
  4.    300-500 meters
 Discuss Question
Answer: Option C. -> 80-100 meters
Question 92. The power factor of industrial loads is generally
  1.    Unity
  2.    Lagging
  3.    Leading
  4.    Zero
 Discuss Question
Answer: Option B. -> Lagging
Question 93. The voltage regulation in magnetic amplifier type voltage regulator is effected by
  1.    Electromagnetic induction
  2.    Varying the resistance
  3.    Varying the reactance
  4.    Variable transformer
 Discuss Question
Answer: Option C. -> Varying the reactance
Question 94. Constant voltage transmission entails the following disadvantage
  1.    Large conductor area is required for same power transmission
  2.    Short-circuit current of the system is increased
  3.    Either of the above
  4.    None of the above
 Discuss Question
Answer: Option B. -> Short-circuit current of the system is increased
Question 95. When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?
  1.    Current will flow to earth
  2.    Supply voltage will drop
  3.    Supply voltage will increase
  4.    No current will flow in the conductor
 Discuss Question
Answer: Option A. -> Current will flow to earth
Question 96. 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
 Discuss Question
Answer: Option C. -> 100-200 ohms
Question 97. Most of the high voltage transmission lines in India are
  1.    Underground
  2.    Overhead
  3.    Either of the above
  4.    None of the above
 Discuss Question
Answer: Option B. -> Overhead
Question 98. Which of the following distribution systems is more reliable?
  1.    Radial system
  2.    Tree system
  3.    Ring main system
  4.    All are equally reliable
 Discuss Question
Answer: Option C. -> Ring main system
Question 99. By which of the following methods string efficiency can be improved?
  1.    Using a guard ring
  2.    Grading the insulator
  3.    Using long cross arm
  4.    Any of the above
 Discuss Question
Answer: Option D. -> Any of the above
Question 100. There is a greater possibility of occurrence of corona during
  1.    Dry weather
  2.    Winter
  3.    Summer heat
  4.    Humid weather
 Discuss Question
Answer: Option D. -> Humid weather

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