Question: The surge resistance of cable is__________?

• 1. 5 ohms
• 2. 20 ohms
• 3. 50 ohms
• 4. 100 ohms

Question: In capacitance grading of cables we use a _______ dielectric?

• 1. composite
• 2. porous
• 3. homogeneous
• 4. hygroscopic

Question: PVC stands for____________?

• 1. polyvinyl chloride
• 2. post varnish conductor
• 3. pressed and varnished cloth
• 4. positive voltage conductor

Question: Conduit pipes are normally used to protect _______ cables:

• 1. unsheathed cables
• 2. armoured
• 3. PVC sheathed cables
• 4. all of the above

Question: The material for armouring on cable is usually__________?

• 1. steel tape
• 2. galvanised steel wire
• 3. any of the above
• 4. none of the above

Question: The relative permittivity of rubber is____________?

• 1. between 2 and 3
• 2. between 5 and 6
• 3. between 8 and 10
• 4. between 12 and 14

Question: Pressure cables are generally not used beyond__________?

• 1. 11 kV
• 2. 33 kV
• 3. 66 kV
• 4. 132 kV

Question: A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?

• 1. one half
• 2. double
• 3. four times
• 4. none of the above

Question: Solid type cables are considered unreliable beyond 66 kV because___________?

• 1. insulation may melt due to higher temperature
• 2. skin effect dominates on the conductor
• 3. of corona loss between conductor and sheath material
• 4. there is a danger of breakdown of insulation due to the presence of voids

Question: In cables the charging current__________?

• 1. lags the voltage by 90°
• 2. leads the voltage by 90°
• 3. lags the voltage by 180°
• 4. leads the voltage by 180°