Identify the Salts That Are in Hard Water

question 124

Multiple Choice

Identify the salts that are in hard water.

• A) CaCO₃ and MgCO₃
• B) MgSO₄ and CaSO₄
• C) NaCl and KBr
• D) NaHSO₄ and Na₂SO₄
• E) NaOCl and HOCl

---

Definitions:

Momentary Contact

Momentary contact refers to an electrical switch or relay contact that only completes the circuit while being physically engaged or pressed.

Three-Wire

A wiring configuration typically used in electrical circuits, incorporating a live wire, a neutral wire, and a ground wire for safety.

Normally-Open

A contact configuration in switches or relays that is open (non-conducting) when at rest, closing only when activated.

Contactor

An electrically controlled switch used for switching an electrical power circuit, commonly used in motor control applications.