Free Master Plumber MCQ Questions And Answers — Questions and Answers
Question 1: How much grade is typically needed for each liner foot of a domestic drainage pipe?
- 1/4 inch (Correct answer)
- 3/4 inch
- 1 inch
- 1/8 inch
Correct answer: 1/4 inch
The size of the drain pipe determines the grade, also known as pitch or fall, for the drain pipe. These plumbing system components are created by master plumbers and other design experts based on the minimal requirements set out by local codes. As a general rule,.25 inch per liner foot of slope is required for a drain with a diameter up to 4 inches.
Question 2: What happens if the size of a 4 inch pipe is decreased in the flow's direction?
- This could cause blockage to build up at the reduction point. (Correct answer)
- This could cause slugging in the waste system.
- This will have no affect on the drainage system.
- The waste will travel faster which will allow for better cleaning of the pipe.
Correct answer: This could cause blockage to build up at the reduction point.
Due to the flow direction at the reduction point, waste might accumulate and clog the ping system.
Question 3: Vacuum pump exhaust must be discharged into the following areas in Med Gas systems:
- Indirect drain
- Outdoors (Correct answer)
- Relief vent
- Designated receptor
Correct answer: Outdoors
Exhaust must be sent outside in a manner that reduces the risk of noise and environmental contamination.
Question 4: In the course of brazing, flux can only be applied when
- Not allowed
- Brazing copper to copper
- Brazing copper to brass (Correct answer)
- Both Brazing copper to brass and Brazing copper to copper
Correct answer: Brazing copper to brass
Only different metals can be brazed together with flux.
Question 5: Gray water must be _____ when it enters a collection reservoir.
- Flow controlled
- Filtered (Correct answer)
- Monitored
- Measured
Correct answer: Filtered
Gray water must first be filtered before entering a gray water collection reservoir. This is necessary to prevent particles from getting into the collection reservoir. There is a chance that some sort of material could end up in the drainage water, even though the fixtures that permit the recycling of gray water shouldn't be conveying solids. These pollutants are prevented from entering the collection of recycled gray water by the filters.
Question 6: How long can gray water be kept in storage before it can be used to flush a toilet or urinal?
- 96 hours
- 24 hours
- 48 hours
- 72 hours (Correct answer)
Correct answer: 72 hours
The retention of gray water that will be utilized to flush toilets or urinals may not last longer than 72 hours. Long-term water storage might encourage the growth of microorganisms. The plumbing system does not need this bacteria. For instance, green water in a toilet tank is unattractive and may be dangerous to one's health. The water held in a collection reservoir would be balanced to the fixtures served by a gray water recycling system when it is suitably sized, and the regular daily use of the fixtures will draw down from the reservoir frequently enough to prevent lengthy water storage.
Question 7: A laundry chute has gas piping installed.
- Is a code violation (Correct answer)
- Is required to be installed with only vertical pipe sections
- Must be secured at maximum intervals of 6 feet
- Must be protected from damage in the normal course of use of the chute
Correct answer: Is a code violation
It is inappropriate to install gas piping in a location that could distribute gas beyond the location of the leak, such as laundry chutes, dumbwaiters, air-circulating ducts, or elevators, which are all prohibited from having gas piping installed in them.
Free Master Plumber MCQ Questions And Answers
How much grade is typically needed for each liner foot of a domestic drainage pipe?