AEP Material Selection & Properties 2

Question 1

Which property describes a material's ability to return to its original shape after the applied load is removed?

Accepted Answer

Elasticity

Answer

Elasticity is the property that allows a material to recover its original dimensions once the deforming stress is removed.

Question 2

In electrical applications, which material is most commonly used for overhead transmission line conductors due to its combination of conductivity and strength?

Accepted Answer

ACSR (Aluminum Conductor Steel Reinforced)

Answer

ACSR combines the high conductivity of aluminum with the tensile strength of a steel core, making it ideal for long-span overhead transmission lines.

Question 3

What does the term 'dielectric strength' refer to in electrical insulating materials?

Accepted Answer

The maximum electric field a material can withstand without breakdown

Answer

Dielectric strength is the maximum electric field intensity (V/m) that an insulating material can sustain without electrical breakdown.

Question 4

Which type of corrosion occurs when two dissimilar metals are in electrical contact in the presence of an electrolyte?

Accepted Answer

Galvanic corrosion

Answer

Galvanic corrosion occurs when two metals with different electrochemical potentials are coupled in a conductive electrolyte, causing the less noble metal to corrode faster.

Question 5

For transformer core laminations, which material property is most critical to minimize energy losses?

Accepted Answer

Low hysteresis and eddy current losses

Answer

Silicon steel with low hysteresis and eddy current losses is used for transformer cores to minimize the energy dissipated as heat during each magnetization cycle.

(AEP) American Electric Power Practice Test

(AEP) American Electric Power Practice Test

AEP Material Selection & Properties 2