Question68:-Which method of casting C.I. pipes gives good result .....
A:-sand casting
B:-mud casting
C:-centrifugal casting
D:-none of the above
Correct Answer:- Option-C
Question69:-What is the range of S.W. pipes available in the market......
A:-100 to 600 mm
B:-100 to 300 mm
C:-100 to 180 mm
D:-100 to 700 mm
Correct Answer:- Option-A
Question70:-Which side of mixing tap hot water line to be connected
A:-right side
B:-Left side
C:-Middle side
D:-Corner side
Correct Answer:- Option-B
Question71:-How to prevent algae growth in O.H. tank?
A:-copper sulphate
B:-aluminium sulphate
C:-lead powder
D:-bleaching powder
Correct Answer:- Option-A

Question72:-What is check the alignment and condition of inside the pipe .....

A:-smoke test
B:-mirror test
C:-air test
D:-hydraulic test
Correct Answer:- Option-B
Question73:-How many days curing is required for S.W. pipe joints .....
A:-7 days
B:-2 days
C:-5 days
D:-3 days
Correct Answer:- Option-A
Question74:-What is the size of flush pipe for low level flushing cistern
A:-32 mm
B:-40 mm
C:-25 mm
D:-50 mm
Correct Answer:- Option-B
Question75:-What causes the siphonic action in soil pipe .....
A--leaked air
B:-foul air
C:-sucked air
D:-air diffuser
Correct Answer:- Option-C

Question76:-What instrument is used while conducting air test in pipe line .....

A:-manometer

inometer

thermometer
D:-tint meter
Correct Answer:- Option-A

Question77:-State the size of ball used in ball test .....
A:-13 mm less than inside diameter of pipe
B:-12 mm less than inside diameter of pipe
C:-11 mm less than inside diameter of pipe
D:-10 mm less than inside diameter of pipe