Polytechnic Engineering Fundamentals 2

Question 1

What is the First Law of Thermodynamics?

Accepted Answer

Energy cannot be created or destroyed, only converted

Answer

The First Law of Thermodynamics is the conservation of energy: total energy in a closed system remains constant.

Question 2

What is the SI unit of power?

Accepted Answer

Watt (W)

Answer

Power is measured in watts (W), where 1 watt equals 1 joule per second.

Question 3

What does Kirchhoff's Current Law (KCL) state?

Accepted Answer

The sum of currents entering a node equals the sum of currents leaving it

Answer

KCL states that current is conserved at any node — what flows in must flow out.

Question 4

Which material property describes resistance to plastic deformation?

Accepted Answer

Hardness

Answer

Hardness is a material's resistance to permanent (plastic) deformation, often measured by indentation tests.

Question 5

What is the purpose of a capacitor in a circuit?

Accepted Answer

To store electrical energy in an electric field

Answer

A capacitor stores electrical energy in the electric field between its two conductive plates.

Polytechnic Practice Test