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Practice Test: Question Set - 06


1. For which of the following equipment current rating is not necessary?
    (A) Circuit breakers
    (B) Isolators
    (C) Load break switch
    (D) Circuit breakers and load break switches

2. On which of the following factors skin effect depends?
    (A) Frequency of the current
    (B) Size of the conductor
    (C) Resistivity of the conductor material
    (D) All of the above

3. The wooden poles well impregnated with creosote oil or any preservative compound has life
    (A) From 2 to 5 years
    (B) 10 to 15 years
    (C) 25 to 30 years
    (D) 60 to 70 years

4. Which of the following D.C. distribution system is the simplest and lowest in first cost?
    (A) Radial system
    (B) Ring system
    (C) Interconnected system
    (D) None of the above

5. The power factor of industrial loads is generally
    (A) Unity
    (B) Lagging
    (C) Leading
    (D) Zero

6. The spacing between phase conductors of a 220 kV line is approximately equal to
    (A) 2 m
    (B) 3.5 m
    (C) 6 m
    (D) 8.5 m

7. Which of the following distribution systems is more reliable?
    (A) Radial system
    (B) Tree system
    (C) Ring main system
    (D) All are equally reliable

8. In a substation the following equipment is not installed
    (A) Exciters
    (B) Series capacitors
    (C) Shunt reactors
    (D) Voltaire transformers

9. In a tap changing transformer, the tapings are provided on
    (A) Primary winding
    (B) Secondary winding
    (C) High voltage winding
    (D) Any of the above

10. The voltage regulation in magnetic amplifier type voltage regulator is effected by
    (A) Electromagnetic induction
    (B) Varying the resistance
    (C) Varying the reactance
    (D) Variable transformer

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