Cr21 practice questions with answers
The mortar joint having a vertical transverse plane best
describes ? - CORRECT ANSWERS ✔✔head joint
What is the minimum spacing between block and rebar
when grouting masonry unit ? - CORRECT ANSWERS
✔✔1/4 inch
What are pipe loops used for ? - CORRECT ANSWERS
✔✔To reduce friction loss
How many volts does an automated sprinkler system
use ? - CORRECT ANSWERS ✔✔24
What is the minimum grade needed for proper drainage ?
- CORRECT ANSWERS ✔✔3 % or greater
Which of the following is used to prevent back siphonage
only ? - CORRECT ANSWERS ✔✔vacuum breakers
What minimum size perforated pipe shall be used in a
gray water irrigation system ? - CORRECT ANSWERS ✔✔3
inches
, Wall ties should be placed how far from the exposed edge
of a masonry unit ? - CORRECT ANSWERS ✔✔5/8 inch
According to the OSHA standards for the construction
industry , compressed air shall not be used for cleaning
purposes except when - CORRECT ANSWERS ✔✔less than
30 psi and with chip guarding
Which of the following conditions in sprinkler's control
wiring could cause a remote control valve that is open to
remain open ? - CORRECT ANSWERS ✔✔current leakage
to the earth from a valve control wire
At which slope is grading required ? - CORRECT ANSWERS
✔✔Less than 5 %
According to code , what is the maximum area of a brick
veneer wall that an anchor tie shall support ? - CORRECT
ANSWERS ✔✔2 square feet
How much base is needed for a paver driveway ? -
CORRECT ANSWERS ✔✔8 to 12 inches
The mortar joint having a vertical transverse plane best
describes ? - CORRECT ANSWERS ✔✔head joint
What is the minimum spacing between block and rebar
when grouting masonry unit ? - CORRECT ANSWERS
✔✔1/4 inch
What are pipe loops used for ? - CORRECT ANSWERS
✔✔To reduce friction loss
How many volts does an automated sprinkler system
use ? - CORRECT ANSWERS ✔✔24
What is the minimum grade needed for proper drainage ?
- CORRECT ANSWERS ✔✔3 % or greater
Which of the following is used to prevent back siphonage
only ? - CORRECT ANSWERS ✔✔vacuum breakers
What minimum size perforated pipe shall be used in a
gray water irrigation system ? - CORRECT ANSWERS ✔✔3
inches
, Wall ties should be placed how far from the exposed edge
of a masonry unit ? - CORRECT ANSWERS ✔✔5/8 inch
According to the OSHA standards for the construction
industry , compressed air shall not be used for cleaning
purposes except when - CORRECT ANSWERS ✔✔less than
30 psi and with chip guarding
Which of the following conditions in sprinkler's control
wiring could cause a remote control valve that is open to
remain open ? - CORRECT ANSWERS ✔✔current leakage
to the earth from a valve control wire
At which slope is grading required ? - CORRECT ANSWERS
✔✔Less than 5 %
According to code , what is the maximum area of a brick
veneer wall that an anchor tie shall support ? - CORRECT
ANSWERS ✔✔2 square feet
How much base is needed for a paver driveway ? -
CORRECT ANSWERS ✔✔8 to 12 inches
