Architecture and Design Mechanical, Electrical, and Plumbing (MEP) Systems 2

Question 1

What is the standard electrical service voltage for residential buildings in the United States?

Accepted Answer

120/240V

Answer

220/440V

Answer

120/208V

Answer

277/480V

Question 2

Which device detects small imbalances between hot and neutral current to protect against electrical shock, and is required by code near water sources?

Accepted Answer

Ground Fault Circuit Interrupter (GFCI)

Answer

Arc Fault Circuit Interrupter (AFCI)

Answer

Surge protector

Answer

Circuit breaker

Question 3

What primary advantage does three-phase electrical distribution offer over single-phase systems in large commercial buildings?

Accepted Answer

It provides smoother, more efficient power delivery for motors and large equipment

Answer

It eliminates the need for a neutral conductor throughout the building

Answer

It reduces voltage to safe levels at all branch circuits

Answer

It allows backup power from two separate utility feeds simultaneously

Question 4

What does an electrical panel's amperage rating indicate?

Accepted Answer

The maximum current the panel can safely carry continuously

Answer

The voltage level of the incoming electrical service

Answer

The number of circuit breaker slots available in the panel

Answer

The total wattage capacity of all connected loads combined

Question 5

Which lighting control strategy uses photosensors to automatically reduce electric light output when sufficient daylight is available?

Accepted Answer

Daylight harvesting

Answer

Occupancy sensing

Answer

Time-of-day scheduling

Answer

Emergency load shedding

Question 6

What is the primary purpose of a building's electrical grounding system?

Accepted Answer

To provide a safe low-resistance path for fault currents and prevent shock hazards

Answer

To increase voltage efficiency across distribution panels

Answer

To filter electrical noise from sensitive electronic equipment

Answer

To balance loads evenly between all electrical phases

Question 7

Which electrical device uses electromagnetic induction to step down high utility transmission voltage to usable building service voltage?

Accepted Answer

Transformer

Answer

Circuit breaker

Answer

Motor control center (MCC)

Answer

Transfer switch