The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the
Water alkalinity & leakage
Hydrazine addition during feed water treatment
Release of non-condensable gas from water in the boiler
Scale formation
- Liquor poisoning generally occurs due to the presence of __________ in it.
- One ton of refrigeration is not equivalent to the heat removal rate of
- Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating…
- Function of gear box is to
- __________ rubber is generally used for making 'O' rings used for vacuum sealings.
- Good design of the casing of a centrifugal pump aims at minimising the
- Biological shield in a nuclear reactor is generally provided to protect against the
- Pressure exerted by a liquid depends upon its
- Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded…
- Which of the following alloying elements is present in maximum percentage in high speed steel?
- Broaching tools are usually made of
- According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear…
- The dew point of moist air becomes __________ with decrease in its relative humidity.
- With increase in impurities in metals, their corrosion resistances
- Air-petrol ratio for maximum power generation in spark ignition engine is about
- Minimum number of members required to form a Public Limited Joint Stock Com-pany is
- With increase in compression ratio, the volumetric efficiency of air compressor
- A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C.…
- The leaching solvent used in Baeyer's process for the purification of bauxite is
- 'Amortization' in respect of financial obligation of a company means the
- L.D. (Linz-Donawitz) converter is used in the production of
- The refractory lining of the bottom in a basic electric arc furnace is made of
- Which of the following is resistant to the action of both heat & chemicals?
- Damage to metal surface by mechanical action is called
- Addition of __________ to steel does not impart hardness.
- Which of the following heat treatment processes is usually applied to castings?
- Increase in temperature, in general results in the
- Identify the false statement
- The joint for soldering is supported by binding wire made of
- Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling…