1.  Excessive unbalanced applied voltage causes _.
a. the pump to run backwards
b. high heat buildup within the stator and rotor assembly
c. intense vibration or cavitation

2. Amperage is _.
a. a difference of potential or electrical pressure
b. a measurement of total energy
c. a measurement of electrical flow

3. Which of these chemicals would be most effective in achieving a pH adjustment to 8.4 so nitrification can take place in an RBC?
a. sulfuric acid
b. sodium hydroxide
c. soda ash
d. none of the above

4. Electric shock may result from current stored in _.
a. transformers
b. capacitors
c. fuses
d. A & B
e. All the above

5. Under which of the following circumstances should sludge wasting normally be increased?
a. mixed liquor settles too slowly
b. large billows of white foam start foaming on the aeration tank surface
c. a dark-brown, scummy foam appears on the aeration tank surface
d. all the above
e. none of the above

Answers:

1. b
2. c
3. c
4. b
5. c