Practice Test: Question Set - 03
1. The insulating material for cables should
- (A) Be acid proof
- (B) Be non-inflammable
- (C) Be non-hygroscopic
- (D) Have all above properties
2. The insulating material for a cable should have
- (A) Low cost
- (B) High dielectric strength
- (C) High mechanical strength
- (D) All of the above
3. In cables the charging current
- (A) Lags the voltage by 90°
- (B) Leads the voltage by 90°
- (C) Lags the voltage by 180°
- (D) Leads the voltage by 180°
4. In capacitance grading a homogeneous dielectric is used.
- (A) Yes
- (B) No
5. The minimum dielectric stress in a cable is at
- (A) Armour
- (B) Bedding
- (C) Conductor surface
- (D) Lead sheath
6. In a cable immediately above metallic sheath ________ is provided.
- (A) Earthing connection
- (B) Bedding
- (C) Armouring
- (D) None of the above
7. The relative permittivity of rubber is
- (A) Between 2 and 3
- (B) Between 5 and 6
- (C) Between 8 and 10
- (D) Between 12 and 14
8. It is difficult to maintain oil filled cables.
- (A) Yes
- (B) No
9. Pressure cables are generally not used beyond
- (A) 11 kV
- (B) 33 kV
- (C) 66 kV
- (D) 132 kV
10. The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to
- (A) Absence of harmonics
- (B) Nonexistence of any stability limit
- (C) Smaller dielectric loss
- (D) Absence of ripples
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