Substation Installations Quiz

What is the purpose of earthing resistance in substation installations?

• To increase voltage

• To prevent electrical shock

• To enhance current flow

• To reduce power consumption

At what temperature does the effect on soil resistivity become negligible?

• 10°C

• 0°C

• 5°C

• -5°C

What happens to soil resistivity when the temperature is more than 0°C?

• It decreases

• It remains constant

• It becomes negligible

• It increases

What is the range of soil resistivity?

• 1 to 100 ohm-m

• 1 to 1000 ohm-m

• 10 to 100 ohm-m

• 10 to 1000 ohm-m

What is the abbreviation for earth fault loop impedance?

• Zf

• Zs

• Ze

• Zc

What does a higher earth fault loop impedance indicate?

• Higher fault current

• Lower fault current

• Faster circuit protection operation

• Increased power consumption

What type of transformer is used for generating a fault current to neutral?

• Step-down transformer

• Grounding transformer

• Isolation transformer

• Auto transformer

What is a reactor primarily composed of?

• A single wire

• A coil with a large number of turns

• A capacitor

• A transformer