Book 2 Unit 2

Question 1

If a faucet drips when closed, or vibrates when opened, the trouble is usually a worn __________ at the lower end of the spindle.
A) Washer
B) Seat
C) Gland
D) Spindle
E) Stem packing

Answer 1

A) Washer

Question 2

The standard or common trap has ________ of maintaining the seal.
A) 10 cm (4 in)
B) 5 cm (2 in)
C) 38 mm (1-1/2 in)
D) 16 mm (5/8 in)
E) 75 mm (2-15/16 in)

Answer 2

C) 38 mm (1-1/2 in)

Question 3

Wastes fro, plumbing fixtures, such as sinks, are discharged through the fixture outlet pipe into a:
A) X-trap
B) C-trap
C) P-trap
D) S-trap
E) B-trap

Answer 3

C) P-trap

Question 4

The purpose of a trap in a sanitary sewer piping system is to:
A) Stop hair and other solids from entering the sewer
B) Allow condensate to escape wile holding back steam
C) Stop sewer gases from escaping from the waste system through the fixture
D) Keep soap scum from getting into the septic system
E) Trap sewer in the system

Answer 4

C) Stop sewer gases from escaping from the waste system through the fixture

Question 5

The material used for indoor sanitary drainage piping in commercial buildings is:
A) PVC plastic
B) Galvanized steel
C) ABS plastic
D) Copper
E) Cast iron

Answer 5

E) Cast iron

Question 6

The atmospheric vacuum breaker has a moving element that should the flow stop and water pressure is lost it ____________ and break the siphon effect.
A) Closes to admit air
B) Closes to admit water
C) Opens to release pressure
D) Opens to admit water
E) Opens to admit air

Answer 6

E) Opens to admit air

Question 7

Most plumbing regulations prohibit single pipe systems over _______ in length from a water heater.
A) 30 m (100 ft)
B) 20 m (66 ft)
C) 40 m (130 ft)
D) 10 m (33 ft)
E) 60 m (200 ft)

Answer 7

A) 30 m (100 ft)

Question 8

Backwater valves are a form of __________ valve.
A) Check
B) Butterfly
C) Gate
D) Globe
E) Ball

Answer 8

A) Check

Question 9

Horizontal branch piping larger than 76 mm (3 in) should be installed with a slope of not less than:
A) 5cm/m (5/8 in/ft)
B) 2 cm/m (1/4 in/ft)
C) 4 cm/m (1/2 in/ft)
D) 3 cm/m (3/8 in/ft)
E) 1cm/m (1/8 in/ft)

Answer 9

E) 1cm/m (1/8 in/ft)

Question 10

The pressure system with pneumatic tank typically has a pump on/off control start of:
A) High water level
B) Low water level
C) High air pressure
D) Low air pressure
E) Below reserve storage level

Answer 10

B) Low water level

Question 11

The pressure system with pneumatic tank typically has a pump on/off pressure differential of:
A) 100 kPa (14.5 psi)
B) 140 kPa (20 psi)
C) 180 kPa (26 psi)
D) 120 kPa (17.4 psi)
E) 160 kPa (23.2 psi)

Answer 11

B) 140 kPa (20 psi)

Question 12

The pressure vacuum breaker consists of a single body containing a spring-loaded check valve and an internally loaded vacuum breaker that _________ whenever the pressure within the body approaches atmospheric pressure.
A) Closes to admit air
B) Opens to release pressure
C) Opens to admit water
D) Closes to admit water
E) Opens to admit air

Answer 12

E) Opens to admit air

Question 13

Water may leak from the flush valve of a water closet flush tank for the following reasons except:
A) The ball could be defective
B) The flush ball might not be seating properly
C) There might be dirt on the ball or the seat
D) The flush seat might be corroded or worn
E) The lift chain could be properly adjusted

Answer 13

E) The lift chain could be properly adjusted

Question 14

The pressure in a plumbing vent system is:
A) Neutral
B) Slightly above atmospheric
C) Vacuum
D) Slight vacuum
E) Atmospheric

Answer 14

E) Atmospheric

Question 15

Weeping tile is usually installed to prevent an accumulation of ground water around the building foundations and to reduce _________ water pressure on the walls below ground level.
A) Hydroscopic
B) Hydronic
C) Hypostatic
D) Hydraulic
E) Hydrostatic

Answer 15

E) Hydrostatic

Question 16

In the ________ system water enters directly into the pump suction is discharged into a pressurized tank from there it flows into the building cold water system.
A) Tankless constant pressure
B) Indirect constant pressure
C) Direct pressure
D) Pressure with pneumatic tank
E) Tank variable pressure

Answer 16

D) Pressure with pneumatic tank

Question 17

The deep trap has _______ of maintaining the seal.
A) 16 mm (5/8 in)
B) 10 cm (4 in)
C) 75 mm (2-15/16 in)
D) 5 cm (2 in)
E) 38 mm (1-1/2 in)

Answer 17

B) 10 cm (4 in)

Question 18

The main function of a storm water drainage system is to remove storm water and to provide ___________ drainage into a storm sewer.
A) Parking lot
B) Surface
C) Roof
D) Sanitary
E) Sub-surface

Answer 18

E) Sub-surface

Question 19

The material used for indoor sanitary drainage piping in single family dwelling is:
A) PVC plastic
B) ABS plastic
C) Cast iron
D) Copper
E) Galvanized steel

Answer 19

B) ABS plastic

Question 20

The reduced pressure principal device consists of two independently acting check valves with an automatic operating _________ valve located between the two check valves.
A) Pressure
B) Temperature differential relief
C) Pressure increasing
D) Pressure differential relief
E) Pressure reducing

Answer 20

D) Pressure differential relief