CBC Mechanical, Electrical & Plumbing (MEP) Systems 2

Question 1

What is the purpose of a backflow preventer in a building's plumbing system?

Accepted Answer

To prevent contaminated water from flowing back into the potable water supply

Answer

To increase water pressure throughout the system

Answer

To reduce water hammer in the pipes

Answer

To regulate domestic hot water temperature

Question 2

Which wiring method is typically required for exposed electrical installations in commercial construction?

Accepted Answer

Electrical metallic tubing (EMT) conduit

Answer

NM cable (Romex)

Answer

Underground feeder cable (UF)

Answer

Service entrance cable (SE)

Question 3

Which HVAC component is responsible for removing excess moisture from indoor air during the cooling process?

Accepted Answer

Evaporator coil

Answer

Furnace heat exchanger

Answer

Condenser fan motor

Answer

Expansion valve only

Question 4

What does the SEER (Seasonal Energy Efficiency Ratio) rating measure on air conditioning equipment?

Accepted Answer

Cooling efficiency over an entire cooling season relative to energy consumed

Answer

Maximum sound output level of the compressor in decibels

Answer

Peak cooling capacity expressed in BTUs per hour

Answer

Airflow speed of the air handler blower in CFM

Question 5

What is the purpose of a GFCI (Ground Fault Circuit Interrupter) outlet in a building?

Accepted Answer

To detect small ground faults and cut power within milliseconds to prevent electrocution

Answer

To provide surge protection against lightning strikes

Answer

To prevent electrical overloads from damaging connected appliances

Answer

To regulate voltage fluctuations on the circuit

Question 6

Where is a service entrance located in a residential electrical system?

Accepted Answer

At the main connection point where utility power enters the building

Answer

At each individual branch circuit outlet

Answer

Inside the sub-panel that feeds a detached garage

Answer

At the grounding electrode system buried in the yard

Question 7

What is the minimum clearance required between a gas water heater and combustible materials per standard codes?

Accepted Answer

6 inches

Answer

1 inch

Answer

3 inches

Answer

12 inches