1. Hazards that may damage a TV camera going through a sewer include _.
a. deep water that submerges the camera
b. fogging of optical lens
c. offset joints
d. all the above

2. Centrifugal pump parts include _.
a. diaphragm
b. piston
c. rotor
d. volute

3. When packing a centrifugal pump, the packing gland should be tightened _.
a. slowly over a period of several hours
b. to 20 foot pounds
c. with wrench and then backed off 1/4 turn
d. none of the above

4. What factors should be considered when providing trench shoring?
a. grade of sewer
b. pipe material
c. structures or sources of vibration near trenches
d. all the above

5. What factors should be considered when providing trench shoring?
a. grade of sewer
b. pipe material
c. structures or sources of vibration near trenches
d. all the above

Answers:

1. d
2. d
3. a
4. a
5. c