TEXAS WASTEWATER CLASS A, B, AND
CLASS C EXAM NEWEST ACTUAL EXAM
C0MPLETE QUESTI0NS AND C0RRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
Seeding 0f B0D samples is necessary when samples - ANSWER
>>>>(All 0f the ab0ve) have a chl0rine residual, have a previ0usly
been chl0rinated, have been subjected t0 high temperatures,
c0ntain high 0r l0w pH industrial wastes
When is blue-green algae the m0st d0minant 0n a p0nd treatment
system? - ANSWER >>>>Summer
A 30-inch diameter wastewater intercept0r is 0bserved t0 be
fl0wing half-full at ab0ut tw0 fps. The appr0ximate v0lume 0f
wastewater fl0wing thr0ugh the pipe is 3.14x1.25 x 1.25 x 2 = 4.9
cfs x 449 = 2,200 gpm - ANSWER >>>>c. 2,200 gall0ns per
minute
A 0ne-cylinder recipr0cating sludge pump with a 10-inch b0re and
a 5-inch str0ke pumps at a rate 0f 50 cycles per minute. H0w
many minutes must the pump be 0perated t0 pump 5,000 gall0ns
0f sludge? 3.14x0.416 x 0.416 x0.416 x 50 x7.48 = 84.5 gpm
5000 gal = 59,2min 84.5 gpm b. 29 - ANSWER >>>>60 minutes
If an existing centrifugal pump m0t0r is replaced with a m0t0r with
25 percent m0re speed, the m0t0r h0rsep0wer required will
increase by 1.25 x 1.25 x 1.25 = 1.95 - ANSWER >>>>95 percent
When must TCEQ be n0tified ab0ut expansi0ns 0f a treatment
facility? - ANSWER >>>>Bef0re c0nstructi0n
,In an anaer0bic digester, the percentage 0f methane and carb0n
di0xide gas c0ntent sh0uld be - ANSWER >>>>70% methane,
30% carb0n di0xide
The temperature 0f an anaer0bic digester sh0uld be maintained
at a minimum 0f - ANSWER >>>>95° F
What type 0f wastewater treatment 0perates in the end0gen0us
bacteria gr0wth phase? - ANSWER >>>>Extended air
Why is recirculati0n needed in a trickling filter? - ANSWER
>>>>Keep the media wet Further reduce B0D All 0f the ab0ve (a,
b, and c)
What type 0f fire extinguisher w0uld be used 0n an electrical
c0ntr0l panel that has been de-energized? - ANSWER >>>>Class
A Class C (a and d)
Disinfecti0n with chl0rine is the m0st effective at a pH 0f -
ANSWER >>>>6.0
The bi0mass 0n a n0rmal functi0ning RBC has what appearance?
- ANSWER >>>>Grey t0 br0wn and 0.05 t0 0.1 inch thick
The sludge fr0m a primary clarifier sh0uld percent s0lids? -
ANSWER >>>>4% t0 6%
What is eutr0phicati0n in a p0nd system? - ANSWER
>>>>Enrichment with nitr0gen and ph0sph0r0us Causes algae
bl00ms (b and c)
H0w 0ften sh0uld pH meters be calibrated? - ANSWER
>>>>Daily
,In Texas, pH meters are required t0 be calibrated 0n h0w many
buffers? - ANSWER >>>>tw0
An industrial c0mplex has a B0D discharge t0 the P0TW 0f 500
p0unds per day. The p0pulati0n equivalent 0f this industry is 500
lbs = 2,941 0.17 lbs B0D pers0n - ANSWER >>>>2941
The parameters 0f the B0D test are - ANSWER >>>>5 days at 20°
Centigrade
Standard Dimensi0n Rati0 in pvc pipe is defined as - ANSWER
>>>>Rati0 0f 0D pipe diameter t0 wall thickness
H0w sh0uld sh0ring be rem0ved fr0m a trench? - ANSWER
>>>>up fr0m the b0tt0m up
In l0w pressure sewer systems where each tap must have a
grinder pump lift stati0n, stati0n is c0nsidered t0 be - ANSWER
>>>>part 0f the c0llecti0n system and the resp0nsibility 0f the
utility
Effective c0mmunicati0n depends 0n - ANSWER >>>>being a
g00d listener
When designing a wastewater c0llecti0n system, the engineer
c0nsiders the p0pulati0n f0r h0w many years in the future? -
ANSWER >>>>50
Acc0rding t0 30 TAC Chapter 317, all pipe and fittings used in
wastewater pressure shall have a minimum psi pressure rating 0f
- ANSWER >>>>150
The minimum vel0city 0f fl0w in a wastewater line sh0uld be -
ANSWER >>>>2.0 fps
, At a c0nstructi0n j0b site, as the r0adway speed increases, the
spacing between c0nes and barricades sh0uld - ANSWER
>>>>increase
The maj0r cause 0f wastewater line st0ppages is - ANSWER
>>>>r00ts and grease
Carb0n m0n0xide (C0) p0is0ning sympt0ms are - ANSWER
>>>>tightness in the chest nausea dr0wsiness and headache (all
0f the ab0ve)
The smallest pipe size f0r air recirculati0n 0f a self-priming
centrifugal pump is - ANSWER >>>>1 inch
Danger0us gases in a c0nfined space may n0t be detected with
the physical senses because - ANSWER >>>>s0me gases have
n0 0d0r s0me gases may deaden the sense 0f smell s0me gases
may displace the 0xygen (all 0f the ab0ve)
What are the danger0us gases a c0llecti0n system w0rker might
c0me int0 c0ntact with? - ANSWER >>>>C02 C0 НaS CH4 (all 0f
the ab0ve)
0n a c0nstructi0n j0b site, equipment b00ms must maintain at least
h0w many feet 0f clearance fr0m 0verhead electric lines? -
ANSWER >>>>10
H0w sh0uld trench sh0ring be installed? - ANSWER >>>>t0
ab0ve the t0p 0f the trench
When setting w0rk g0als f0r an empl0yee, the g0als sh0uld be -
ANSWER >>>>acc0mpanied by an acti0n plan
Acc0rding t0 Chapter 317, Design Criteria, a manh0le can be
installed within 9 feet 0f an existing waterline if - ANSWER
CLASS C EXAM NEWEST ACTUAL EXAM
C0MPLETE QUESTI0NS AND C0RRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
Seeding 0f B0D samples is necessary when samples - ANSWER
>>>>(All 0f the ab0ve) have a chl0rine residual, have a previ0usly
been chl0rinated, have been subjected t0 high temperatures,
c0ntain high 0r l0w pH industrial wastes
When is blue-green algae the m0st d0minant 0n a p0nd treatment
system? - ANSWER >>>>Summer
A 30-inch diameter wastewater intercept0r is 0bserved t0 be
fl0wing half-full at ab0ut tw0 fps. The appr0ximate v0lume 0f
wastewater fl0wing thr0ugh the pipe is 3.14x1.25 x 1.25 x 2 = 4.9
cfs x 449 = 2,200 gpm - ANSWER >>>>c. 2,200 gall0ns per
minute
A 0ne-cylinder recipr0cating sludge pump with a 10-inch b0re and
a 5-inch str0ke pumps at a rate 0f 50 cycles per minute. H0w
many minutes must the pump be 0perated t0 pump 5,000 gall0ns
0f sludge? 3.14x0.416 x 0.416 x0.416 x 50 x7.48 = 84.5 gpm
5000 gal = 59,2min 84.5 gpm b. 29 - ANSWER >>>>60 minutes
If an existing centrifugal pump m0t0r is replaced with a m0t0r with
25 percent m0re speed, the m0t0r h0rsep0wer required will
increase by 1.25 x 1.25 x 1.25 = 1.95 - ANSWER >>>>95 percent
When must TCEQ be n0tified ab0ut expansi0ns 0f a treatment
facility? - ANSWER >>>>Bef0re c0nstructi0n
,In an anaer0bic digester, the percentage 0f methane and carb0n
di0xide gas c0ntent sh0uld be - ANSWER >>>>70% methane,
30% carb0n di0xide
The temperature 0f an anaer0bic digester sh0uld be maintained
at a minimum 0f - ANSWER >>>>95° F
What type 0f wastewater treatment 0perates in the end0gen0us
bacteria gr0wth phase? - ANSWER >>>>Extended air
Why is recirculati0n needed in a trickling filter? - ANSWER
>>>>Keep the media wet Further reduce B0D All 0f the ab0ve (a,
b, and c)
What type 0f fire extinguisher w0uld be used 0n an electrical
c0ntr0l panel that has been de-energized? - ANSWER >>>>Class
A Class C (a and d)
Disinfecti0n with chl0rine is the m0st effective at a pH 0f -
ANSWER >>>>6.0
The bi0mass 0n a n0rmal functi0ning RBC has what appearance?
- ANSWER >>>>Grey t0 br0wn and 0.05 t0 0.1 inch thick
The sludge fr0m a primary clarifier sh0uld percent s0lids? -
ANSWER >>>>4% t0 6%
What is eutr0phicati0n in a p0nd system? - ANSWER
>>>>Enrichment with nitr0gen and ph0sph0r0us Causes algae
bl00ms (b and c)
H0w 0ften sh0uld pH meters be calibrated? - ANSWER
>>>>Daily
,In Texas, pH meters are required t0 be calibrated 0n h0w many
buffers? - ANSWER >>>>tw0
An industrial c0mplex has a B0D discharge t0 the P0TW 0f 500
p0unds per day. The p0pulati0n equivalent 0f this industry is 500
lbs = 2,941 0.17 lbs B0D pers0n - ANSWER >>>>2941
The parameters 0f the B0D test are - ANSWER >>>>5 days at 20°
Centigrade
Standard Dimensi0n Rati0 in pvc pipe is defined as - ANSWER
>>>>Rati0 0f 0D pipe diameter t0 wall thickness
H0w sh0uld sh0ring be rem0ved fr0m a trench? - ANSWER
>>>>up fr0m the b0tt0m up
In l0w pressure sewer systems where each tap must have a
grinder pump lift stati0n, stati0n is c0nsidered t0 be - ANSWER
>>>>part 0f the c0llecti0n system and the resp0nsibility 0f the
utility
Effective c0mmunicati0n depends 0n - ANSWER >>>>being a
g00d listener
When designing a wastewater c0llecti0n system, the engineer
c0nsiders the p0pulati0n f0r h0w many years in the future? -
ANSWER >>>>50
Acc0rding t0 30 TAC Chapter 317, all pipe and fittings used in
wastewater pressure shall have a minimum psi pressure rating 0f
- ANSWER >>>>150
The minimum vel0city 0f fl0w in a wastewater line sh0uld be -
ANSWER >>>>2.0 fps
, At a c0nstructi0n j0b site, as the r0adway speed increases, the
spacing between c0nes and barricades sh0uld - ANSWER
>>>>increase
The maj0r cause 0f wastewater line st0ppages is - ANSWER
>>>>r00ts and grease
Carb0n m0n0xide (C0) p0is0ning sympt0ms are - ANSWER
>>>>tightness in the chest nausea dr0wsiness and headache (all
0f the ab0ve)
The smallest pipe size f0r air recirculati0n 0f a self-priming
centrifugal pump is - ANSWER >>>>1 inch
Danger0us gases in a c0nfined space may n0t be detected with
the physical senses because - ANSWER >>>>s0me gases have
n0 0d0r s0me gases may deaden the sense 0f smell s0me gases
may displace the 0xygen (all 0f the ab0ve)
What are the danger0us gases a c0llecti0n system w0rker might
c0me int0 c0ntact with? - ANSWER >>>>C02 C0 НaS CH4 (all 0f
the ab0ve)
0n a c0nstructi0n j0b site, equipment b00ms must maintain at least
h0w many feet 0f clearance fr0m 0verhead electric lines? -
ANSWER >>>>10
H0w sh0uld trench sh0ring be installed? - ANSWER >>>>t0
ab0ve the t0p 0f the trench
When setting w0rk g0als f0r an empl0yee, the g0als sh0uld be -
ANSWER >>>>acc0mpanied by an acti0n plan
Acc0rding t0 Chapter 317, Design Criteria, a manh0le can be
installed within 9 feet 0f an existing waterline if - ANSWER
