Adiabatic Equations Quiz

What is the purpose of adiabatic equations for electricians?

• To calculate the time it takes for a cable to reach its limiting temperature

• To determine the size of the conductor to avoid overheating

• To predict the temperature changes in the cable

• To calculate the resistance of the cable

What does the letter 'i' represent in the adiabatic equations?

• Current

• Fault current

• Resistance

• Voltage

What is the limiting temperature for thermoplastic cables?

• 100 degrees centigrade

• 90 degrees centigrade

• 50 degrees centigrade

• 70 degrees centigrade

What is the formula to calculate the time it takes for a cable to reach its limiting temperature?

• t = k + s - i

• t = k * s * i

• t = k^2 * s^2 / i^2

• t = k / s * i

What is the minimum size of copper conductor required to carry a fault current of 800 amps with a k factor of 143 and a disconnection time of 0.4 seconds?

• 7 millimeters

• 8 millimeters

• 6 millimeters

• 5.49 millimeters

What is the tabulated size for an earth conductor installed with live conductors of csa 25 millimeters?

• 30 millimeters

• 25 millimeters

• 20 millimeters

• 16 millimeters

What is the purpose of using a lookup table in adiabatic equations?

• To calculate the resistance of the cable

• To determine the size of the conductor to avoid overheating

• To ensure the cable is more than big enough

• To predict the temperature changes in the cable

What is the fault current for a circuit protective conductor in a final circuit with a disconnection time of 0.4 seconds, if the minimum size of copper conductor required is 6 millimeters with a k factor of 115?

• 340 amps

• 500 amps

• 650 amps

• 800 amps

What is the minimum size of copper conductor required to carry a fault current of 1000 amps with a k factor of 115 and a disconnection time of 0.4 seconds?

• 8 millimeters

• 5.49 millimeters

• 6 millimeters

• 7 millimeters

What is the tabulated size for an earth conductor installed with live conductors of csa 35 millimeters?

• 20 millimeters

• 16 millimeters

• 35 millimeters

• 25 millimeters