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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