Related Questions

Out of the following, __________ pipe is the least corrosion resistant.
A Mild steel
B Copper
C Wrought iron
D Stainless steel
A tank is fitted with 8 pipes, some of them that fill the tank and others that are waste pipe meant to those that empty the tank can empty it in 6 hours. If all the pipes are kept open when the tank is full, it will take exactly 6 hours for the tank to empty. How many of these are these are fill pipes?
A 2
B 4
C 6
D 5
The most resistant material to alkaline corrosion is
A Duriron
B Nickel
C Aluminium
D Karbate
Corrosion involves exchange of electrons in __________ corrosion.
A Chemical
B Electrochemical
C Both A & B
D Neither A nor B
Corrosion of well pipes may not be reduced by
A reducing the draw down and the pumping rate
B reducing the flow velocity
C using thicker pipes
D using screens having larger area of openings
The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called :
A Zinc plating
B Alloy formation
C Vulcanization
D Galvanization
A tank is filled by three pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The second pipe fills the tank 5 hours faster than the first pipe and 4 hours slower than the third pipe. The time required by the first pipe is:
A 6 hours
B 10 hours
C 15 hours
D 30 hours
Two pipes A and B can fill a tank in 20 and 30 minutes respectively . If both the pipes are used together , then how long will it take to fill the tank ?
A 12 min
B 15 min
C 25 min
D 50 min
Three pipes can independently fill a water tank in 10,12 and 15 hours. How many hours will it take for all three pipes opened together to fill half of the tank?
A 6
B 5
C 4
D 2
Two pipes A & B would fill a tank in 20 & 30 minutes respectively. Both pipes being open, find when A must be turned off so that tank may be just filled in 15 minutes.
A After 10 minutes
B After 20 minutes
C After 15 minutes
D None

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