Electrical Cables Objective Questions - Set 01 - ObjectiveBooks

Electrical Cables Objective Questions - Set 01

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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