Plumbing Level 1 Exam
Questions and Complete
Solutions Graded A+
What do IPS and NPS Stand for? - Answer: Iron Pipe Size, Nominal Pipe Size
How many threads per inch are on 1/4" and 3/8" NPS? - Answer: 18 threads per inch
How many threads per inch are on 1/2" and 3/4" NPS? - Answer: 14 Threads per inch
How many threads per inch are on 1", 1 1/4", 1 1/2", and 2" NPS - Answer: 11 1/2 threads per inch
How many threads per inch are on 2 1/2" NPS and Larger - Answer: 8 Threads per inch
What angle are the threads on an end of threaded pipe? - Answer: 60 degrees
What is Thread pitch? - Answer: The space between the crowns or roots of two threads
What do you call a thread with no taper? - Answer: Running Thread
At what size is steel pipe no longer measured from by its inside diameter? - Answer: 12 inch
What is the letter designation for the heaviest wall thickness - Answer: XXS OR XXH
When does the building drain become the building sewer? - Answer: 1m from the outside of the
foundation wall
, Define Fixture Drain - Answer: The pipe that connects the fixture trap to another part of the drainage
system
When is a pipe considered to be vertical? - Answer: 45 degrees or more above true horizontal plane
What are the 4 sanitary fixtures - Answer: WC, Urinal, Bedpan Washer and Bidet
How many fixtures does a horizontal branch receive discharge from? - Answer: Two or More
What 4 components promote bacterial growth in a waste pipe - Answer: Temperature, Moisture,
Darkness, Oxygen
What is the minimum trap seal depth - Answer: 38 mm (1.5 inches)
What is the minimum trap seal depth if the trap sees acid - Answer: 2 inches
4 factors that determine minimum trap size for a fixture - Answer: - The volume of waste to be removed
- The Type of waste to be removed
- Type of fixture and its flushing characteristics
- Depth of trap seal
At what capacity is horizontal drainage pipe designed to flow at? - Answer: 65%
At what capacity is vertical drainage pipe designed to flow at? - Answer: 29%
What Type of trap seal loss would be likely to result from the use of an S-trap? - Answer: Direct
Siphonage
Questions and Complete
Solutions Graded A+
What do IPS and NPS Stand for? - Answer: Iron Pipe Size, Nominal Pipe Size
How many threads per inch are on 1/4" and 3/8" NPS? - Answer: 18 threads per inch
How many threads per inch are on 1/2" and 3/4" NPS? - Answer: 14 Threads per inch
How many threads per inch are on 1", 1 1/4", 1 1/2", and 2" NPS - Answer: 11 1/2 threads per inch
How many threads per inch are on 2 1/2" NPS and Larger - Answer: 8 Threads per inch
What angle are the threads on an end of threaded pipe? - Answer: 60 degrees
What is Thread pitch? - Answer: The space between the crowns or roots of two threads
What do you call a thread with no taper? - Answer: Running Thread
At what size is steel pipe no longer measured from by its inside diameter? - Answer: 12 inch
What is the letter designation for the heaviest wall thickness - Answer: XXS OR XXH
When does the building drain become the building sewer? - Answer: 1m from the outside of the
foundation wall
, Define Fixture Drain - Answer: The pipe that connects the fixture trap to another part of the drainage
system
When is a pipe considered to be vertical? - Answer: 45 degrees or more above true horizontal plane
What are the 4 sanitary fixtures - Answer: WC, Urinal, Bedpan Washer and Bidet
How many fixtures does a horizontal branch receive discharge from? - Answer: Two or More
What 4 components promote bacterial growth in a waste pipe - Answer: Temperature, Moisture,
Darkness, Oxygen
What is the minimum trap seal depth - Answer: 38 mm (1.5 inches)
What is the minimum trap seal depth if the trap sees acid - Answer: 2 inches
4 factors that determine minimum trap size for a fixture - Answer: - The volume of waste to be removed
- The Type of waste to be removed
- Type of fixture and its flushing characteristics
- Depth of trap seal
At what capacity is horizontal drainage pipe designed to flow at? - Answer: 65%
At what capacity is vertical drainage pipe designed to flow at? - Answer: 29%
What Type of trap seal loss would be likely to result from the use of an S-trap? - Answer: Direct
Siphonage
