Practice Test: Question Set - 01
1. In the cables, the location of fault is usually found out by comparing
- (A) The resistance of the conductor
- (B) The inductance of conductors
- (C) The capacitances of insulated conductors
- (D) All above parameters
2. A cable carrying alternating current has
- (A) Hysteresis losses only
- (B) Hysteresis and leakage losses only
- (C) Hysteresis, leakage and copper losses only
- (D) Hysteresis, leakage, copper and friction losses
3. If the length of a cable is doubled, its capacitance
- (A) Becomes one-fourth
- (B) Becomes one-half
- (C) Becomes double
- (D) Remains unchanged
4. The breakdown voltage of a cable depends on
- (A) Presence of moisture
- (B) Working temperature
- (C) Time of application of the voltage
- (D) All of the above
5. In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables is often adopted.
- (A) Yes
- (B) No
6. In single core cables armouring is not done to
- (A) Avoid excessive sheath losses
- (B) Make it flexible
- (C) Either of the above
- (D) None of the above
7. Solid type cables are considered unreliable beyond 66 kV because
- (A) Insulation may melt due to higher temperature
- (B) Skin effect dominates on the conductor
- (C) Of corona loss between conductor and sheath
material
- (D) There is a danger of breakdown of insulation due to
the presence of voids
8. The breakdown of insulation of the cable can be avoided economically by the use of
- (A) Inter-sheaths
- (B) Insulating materials with different dielectric
constants
- (C) Both (A) and (B)
- (D) None of the above
9. Copper as conductor for cables is used as
- (A) Annealed
- (B) Hardened and tempered
- (C) Hard drawn
- (D) Alloy with chromium
10. In a cable, the maximum stress under operating conditions is at
- (A) Insulation layer
- (B) Sheath
- (C) Armour
- (D) Conductor surface
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