CITB CITB Electrical and Mechanical Services 2

Question 1

What is the purpose of a lockout/tagout (LOTO) procedure in construction electrical work?

Accepted Answer

To prevent accidental energization of equipment during maintenance

Answer

LOTO procedures ensure energy sources are isolated and cannot be re-energized while workers perform maintenance.

Question 2

What British thermal unit (BTU) rating indicates the heating or cooling capacity of HVAC equipment?

Accepted Answer

BTU/hr

Answer

BTU per hour (BTU/hr) is the standard US measurement of heating or cooling output for HVAC equipment.

Question 3

Which type of electrical conduit provides the best mechanical protection in exposed construction areas?

Accepted Answer

Rigid metal conduit (RMC)

Answer

Rigid metal conduit (RMC) offers the highest mechanical protection and is used in areas subject to physical damage.

Question 4

What is the minimum ampacity required for a 20-amp branch circuit conductor under NEC rules?

Accepted Answer

20 amps

Answer

Conductors for a 20-amp branch circuit must be rated at least 20 amps under NEC Article 210.

Question 5

In plumbing, what is the function of a P-trap?

Accepted Answer

To hold a water seal preventing sewer gas entry

Answer

A P-trap maintains a water seal in the drain line that blocks sewer gases from entering the building.

(CITB) Construction Industry Training Board Practice Test