Related Questions

Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode
A Occurs higher in the electro-chemical series of metals
B Is exemplified by magnesium plate
C Is much cheaper than the cathodic base material to be guarded against corrosion
D All of the above
A pipeline buried in soil is commonly protected from corrosion by
A anodic protection
B cathodic protection
C using inhibitors
D using a special alloy resistant to corrosion
Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an
A Weir
B Hot wire anemometer
C Cup and vane aneometer
D None of these
Cathodic protection is widely used in controlling corrosion in
A High pressure vessels
B Marine structure & underground pipelines
C Overhead fuel gas pipelines
D Overhead water pipelines
Which of the following is an example of cathodic protection of metals against corrosion ?
A Painted steel
B Galvanised iron
C Case hardened steel
D Lead lined reactor
Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher
A Ductility
B Impact strength
C Machinability
D Melting point
Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction?
A Oxidation of Na+ ions
B Oxidation of Cl- ions
C Reduction of Na+ ions
D Reduction of Cl- ions
The material commonly used for sheaths of underground cables is
A Lead
B Rubber
C Copper
D Iron
A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
A Increase
B Decrease
C Remain unaffected
D May increase or decrease; depends on the thickness of each layer
A steel mill produces 180 tons of steel per month Raw materials cost for each ton of production is Tk. 1200. Other expenses of that mill are Tk. 90,000 in each month what should be the selling price of each ton of steel in order to make 10% profit?
A 1870
B 1845
C 1842
D 18145

Next steps