What is the most commonly used insulating materials for low and medium-voltage cables?

• Porcelain

• Silicone rubber

• Polyvinylchloride

• Nomex

Which one of the following is NOT a form of insulators?

• Liquid

• Gas

• Solid

• Foam

Please select apparatus(es) that could benefit from the application of insulation.

• Circuit breakers

• Power transformers

• Power capacitors

• High voltage bushing

How many principal areas where the application of insulation in a power transformer is needed?

• 3

• 4

• 5

• 6

Name the principal area labelled as 'd' in the figure.

• turn to turn insulation

• high voltage coil to low voltage coil insulation

• low voltage coil to earth insulation

• coil to coil insulation

The insulator in cables should have

• low dielectric constant and low power factor

• low dielectric constant and high power factor

• high dielectric constant and high power factor

• high dielectric constant and low power factor

Why does PVC is NOT suitable as an insulator for high voltage cable?

• High dielectric constant and high loss

• High dielectric constant and low loss

• Low dielectric constant and low loss

• Low dielectric constant and high loss

The required properties for an insulation paper in power capacitor application are

• high dielectric strength and high dielectric constant

• high dielectric strength and low dielectric constant

• low dielectric strength and low dielectric constant

• low dielectric strength and high dielectric constant

Which one from the list below is NOT the types of a treated paper insulator in high voltage bushing application?

• Resin-bonded paper (RBP)

• Resin-impregnated paper (RIP)

• Oil-bonded paper (OBP)

• Oil-impregnated paper (OIP)

The transformer should be in the liquid state over the complete operating range of temperatures between

• -50℃ and +10℃.

• -50℃ and -40℃.

• -140℃ and +150℃.

• -40℃ and +50℃.