More Collection Questions

Which of the following terms refers to groundwater seeping into a sanitary sewer?

1. Exfiltration
2. Filtration
3. Infiltration
4. Inflow

Hydrogen sulfide gas is most likely found in a collection system with a low pH or high pH?

Chlorine ton cylinders at room temperature will deliver gas at a maximum rate of

      150 lb cylinders        Ton Containers

A.  10 pounds per day      100 pounds per day

B.  25 pounds per day      250 pounds per day

C.  40 pounds per day      450 pounds per day

D.  150 pounds per day    2000 pounds per day

Which of the following valves only permits flow to move in one direction?

A.  Butterfly

B.  Check

C.  Gate

D.  Plug

The specific gravity of a colloidal solid is very close to 1.  This means that the colloid

A.  Will float within an hour

B.  Will settle within an hour

C.  Won’t settle or float

The specific gravity of a settleable solid is

A.  1

B.  Greater than 1

C.  Less than 1

The specific gravity of a floatable solid is

A.  1

B.  Greater than 1

C.  Less than 1

The specific gravity of chlorine gas is

A.  1

B.  Greater than 1

C.  Less than 1

Which of the following is correct?

A.  A is the follower and B is the lantern ring

B.  A is the lantern ring and B is a packing ring

C.  A is a packing ring and B is the lantern ring

D.  A is a packing ring and B is the follower

pH measures

A.  H⁺

B.  OH^–

C.  O₂

D.  Phosphorus

How do you know that your pump is cavitating?

A.  It doesn’t sound right

B.  It runs hot

C.  It won’t start

D.   All of the above

An atom is composed of

A.  Electrons

B.  Neutrons

C.  Protons

D.  All of the above

Throttling the discharge valve on a centrifugal pump will the likely ______ temperature of the motor and ______ the temperature of the pump

A.  Increase, increase

B.  Increase, reduce

C.  Reduce, increase

D.  Reduce, reduce

The chemical symbol for chlorine gas is

A.  Cl

B.  Cl^–

C.  Cl₂

D.  HOCl

Which of the following is the indicator used for pathogens?

A.  Amoebic dysentery

B.  E. coli

C.  Salmonella typhosa

D.  V. comma

Pump suction and discharge pressures are usually measured in

A.  gpm

B.  kWh  

C.  mg/L

D.  psi

The PE for flow is _____ gpcd and PE for BOD is _____ lbs BOD/person/day.

A.  0.17 for both

B.  0.17 and 100

C.  100 and 0.17

D.  100 for both

What is the minimum recommended velocity in sanitary sewers?

A.  0.2 fps

B.  1 fps

C.  2 fps

D.  10 fps