Question: The advantage of oil filled cables is_________?

• 1. more perfect impregnation
• 2. smaller overall size
• 3. no ionisation, oxidation and formation of voids
• 4. all of the above

Question: The breakdown voltage of a cable depends on_____________?

• 1. presence of moisture
• 2. working temperature
• 3. time of application of the voltage
• 4. all of the above

Question: The thickness of metallic shielding on cables is usually_______________?

• 1. 0.04 mm
• 2. 0.2 to 0.4 mm
• 3. 3 to 5 mm
• 4. 40 to 60 mm

Question: Underground cables are laid at sufficient depth___________?

• 1. to minimise temperature stresses
• 2. to avoid being unearthed easily due to removal of soil
• 3. to minimize the effect of shocks and vibrations due to gassing vehicles, etc
• 4. for all of the above reasons

Question: The electrostatic stress in underground cables is_________?

• 1. same at the conductor and the sheath
• 2. minimum at the conductor and maximum at the sheath
• 3. maximum at the conductor and minimum at the sheath
• 4. zero at the conductor as well as on the sheath

Question: A cable carrying alternating current has__________?

• 1. hysteresis losses only
• 2. hysteresis and leakage losses only
• 3. hysteresis, leakage and copper losses only
• 4. hysteresis, leakage, copper and friction losses

Question: Capacitance grading of cable implies__________?

• 1. use of dielectrics of different permeabilities
• 2. grading according to capacitance of cables per km length
• 3. cables using single dielectric in different concentrations
• 4. capacitance required to be introduced at different lengths to counter the effect of inductance

Question: The advantage of cables over overhead transmission lines is___________?

• 1. easy maintenance
• 2. low cost
• 3. can be used in congested areas
• 4. can be used in high voltage circuits

Question: Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ____________?

• 1. Polyvinyle chloride
• 2. Vulcanised rubber
• 3. Impregnated paper
• 4. Compressed SFe gas

Question: The insulation of the cable decreases with__________?

• 1. the increase in length of the insulation
• 2. the decrease in the length of the insulation
• 3. either A or B
• 4. none of the above