Practice Test: Question Set - 05
1. There is a greater possibility of occurrence of corona during
- (A) Dry weather
- (B) Winter
- (C) Summer heat
- (D) Humid weather
2. Owing to skin effect
- (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
3. Pin type insulators are generally not used for voltages beyond
- (A) 1 kV
- (B) 11 kV
- (C) 22 kV
- (D) 33 kV
4. The effect of corona can be detected by
- (A) Presence of ozone detected by odour
- (B) Hissing sound
- (C) Faint luminous glow of bluish color
- (D) All of the above
5. When a conductor carries more current on the surface as compared to core, it is due to
- (A) Permeability variation
- (B) Corona
- (C) Skin effect
- (D) Unsymmetrical fault
6. Overhead system can be designed for operation up to
- (A) 11 kV
- (B) 33 kV
- (C) 66 kV
- (D) 400 kV
7. The phenomenon of rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the
- (A) See-back effect
- (B) Ferranti effect
- (C) Raman effect
- (D) None of the above
8. High voltage transmission lines use
- (A) Suspension insulators
- (B) Pin insulators
- (C) Both (A) and (B)
- (D) None of the above
9. The material commonly used for sheaths of underground cables is
- (A) Lead
- (B) Rubber
- (C) Copper
- (D) Iron
10. The power transmitted will be maximum when
- (A) Corona losses are minimum
- (B) Reactance is high
- (C) Sending end voltage is more
- (D) Receiving end voltage is more
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