The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the

Question

The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the

A. Water alkalinity & leakage

B. Hydrazine addition during feed water treatment

C. Release of non-condensable gas from water in the boiler

D. Scale formation

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Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion.

A. Annealing

B. Toughening

C. Work hardening

D. Tempering

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The leaching solvent used in Baeyer's process for the purification of bauxite is

A. Ammonium hydroxide

B. Sodium carbonate

C. Sodium hydroxide

D. Ammonium carbonate

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Unbreakable crockeries are made from __________ polymers.

A. Polystyrene

B. Melamine

C. Polystyrene

D. Polyurethane

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Cementite is in the lamellar form in the __________ phase of steel.

A. Martenistic

B. Bainitic

C. Pearlitic

D. Ferritic

Discuss this answer

Dislocations are __________ defects.

A. Point

B. Line

C. Volume

D. None of these

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The dimensional formula of bulk modulus of elasticity is same as that of the

A. Pressure

B. Density

C. Force

D. None of these

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Powder metallurgy process does not make metal powder by

A. Atomisation

B. Grinding/milling

C. Hammering

D. Electrolytic deposition

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Oxyacetylene reducing flame is used while carrying out welding on

A. Alloy steel

B. Grey cast iron

C. Mild steel

D. High carbon steel

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Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?

A. Output & fineness

B. Velocity

C. Both (A) & (B)

D. None of these

Discuss this answer

Corona discharge is related to the operation of a/an

A. Induction motor

B. Electrostatic precipitator

C. Fast breeder reactor

D. Magneto hydrodynamic generator (MHD)

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Angular displacement can be measured suitably by a

A. Shaft encoder

B. Linear variable differential transducer (LVDT)

C. Stroboscope

D. Tachometer

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Pick out the wrong statement about the machinability of metals. Machinability of a metal

A. Decreases with increase in strain hardening tendencies

B. Decreases with increase in hardness, in general

C. Depend on the composition, microstructure and physical & mechanical properties

D. Decreases with increases in tensile strength & decrease in grain size

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While the bin cards are used in the effective stores management, the queuing theory is associated with the __________ time.

A. Waiting

B. Idle

C. Inspection

D. Tool replacement

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For a spontaneous natural process at constant temperature and pressure, the free energy of the system always

A. Increases

B. Decreases

C. Remain constant

D. Increases to a maximum before decreasing

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Pick out the wrong statement about nucleate boiling.

A. Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface

B. Surface temperature is greater than the saturation temperature of the liquid

C. Heat transfer from the surface of the liquid is less than that in film boiling

D. The temperature is less than that of film boiling

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Boiler draught of 10 mm water column is equivalent to

A. 1 kgf/m²

B. 10 kgf/m²

C. 10 kgf/mm²

D. 1 kgf/mm²

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In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material?

A. Tin

B. Lead

C. Zinc

D. Glass

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Which of the following fastening devices has its both ends threaded?

A. Bolt

B. Stud

C. Set screw

D. Split nut

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Increasing the carbon content of steel

A. Reduces the upper shelf energy

B. Increasing the ductility transition temperature

C. Decreases brittleness

D. Decreases hardness

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For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³) while the C.V. is same on weight basis (i.e., kcal/kg)?

A. Propane and acetylene

B. Propane and LPG

C. Sewage gas and gobar gas

D. B.F gas and coke oven gas

Discuss this answer

The same volume of all gases is representative of their

A. Specific gravities

B. Densities

C. Gas characteristic constants

D. Molecular weights

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Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.

A. 10

B. 20

C. 30

D. 40

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The joint for soldering is supported by binding wire made of

A. Mild steel

B. Copper

C. Soft iron

D. Stainless steel

Discuss this answer

The most serious manufacturing defect from fracture toughness point of view is

A. Surface roughness

B. Pores

C. Spherical inclusion

D. Crack

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More than 95% of __________ is present in corundum.

A. SiO₂

B. Al₂O₃

C. CaSiO₂

D. MgO

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Which of the following is not an ore of copper?

A. Cryolite

B. Azurite

C. Chalcopyrite

D. Malachite

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The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

A. More

B. Equal

C. Less

D. Double

Discuss this answer

A jet engine turbine blade is normally manufactured by

A. Forging

B. Shell moulding

C. Investment casting

D. Pressure die casting

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Annealing of cast iron

A. Softens it to facilitate machining

B. Decreases the free carbon

C. Increases the strength

D. None of these

Discuss this answer

Diffusion co-efficient of a metal in a solid solution depends upon its

A. Composition

B. Temperature

C. Both (A) & (B)

D. Neither (A) nor (B)

Discuss this answer

Accepted Answer

C. Release of non-condensable gas from water in the boiler

The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the

Correct Answer :

Show all Chemical Engineering Basics MCQ

Related Questions

Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion.

The leaching solvent used in Baeyer's process for the purification of bauxite is

Unbreakable crockeries are made from __________ polymers.

Cementite is in the lamellar form in the __________ phase of steel.

Dislocations are __________ defects.

The dimensional formula of bulk modulus of elasticity is same as that of the

Powder metallurgy process does not make metal powder by

Oxyacetylene reducing flame is used while carrying out welding on

Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?

Corona discharge is related to the operation of a/an

Angular displacement can be measured suitably by a

Pick out the wrong statement about the machinability of metals. Machinability of a metal

While the bin cards are used in the effective stores management, the queuing theory is associated with the __________ time.

For a spontaneous natural process at constant temperature and pressure, the free energy of the system always

Pick out the wrong statement about nucleate boiling.

Boiler draught of 10 mm water column is equivalent to

In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material?

Which of the following fastening devices has its both ends threaded?

Increasing the carbon content of steel

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³) while the C.V. is same on weight basis (i.e., kcal/kg)?

The same volume of all gases is representative of their

Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.

The joint for soldering is supported by binding wire made of

The most serious manufacturing defect from fracture toughness point of view is

More than 95% of __________ is present in corundum.

Which of the following is not an ore of copper?

The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

A jet engine turbine blade is normally manufactured by

Annealing of cast iron

Diffusion co-efficient of a metal in a solid solution depends upon its

Also checkout

The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the

Correct Answer :

Show all Chemical Engineering Basics MCQ

Related Questions

Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion.

The leaching solvent used in Baeyer's process for the purification of bauxite is

Unbreakable crockeries are made from __________ polymers.

Cementite is in the lamellar form in the __________ phase of steel.

Dislocations are __________ defects.

The dimensional formula of bulk modulus of elasticity is same as that of the

Powder metallurgy process does not make metal powder by

Oxyacetylene reducing flame is used while carrying out welding on

Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?

Corona discharge is related to the operation of a/an

Angular displacement can be measured suitably by a

Pick out the wrong statement about the machinability of metals. Machinability of a metal

While the bin cards are used in the effective stores management, the queuing theory is associated with the __________ time.

For a spontaneous natural process at constant temperature and pressure, the free energy of the system always

Pick out the wrong statement about nucleate boiling.

Boiler draught of 10 mm water column is equivalent to

In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material?

Which of the following fastening devices has its both ends threaded?

Increasing the carbon content of steel

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg)?

The same volume of all gases is representative of their

Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.

The joint for soldering is supported by binding wire made of

The most serious manufacturing defect from fracture toughness point of view is

More than 95% of __________ is present in corundum.

Which of the following is not an ore of copper?

The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

A jet engine turbine blade is normally manufactured by

Annealing of cast iron

Diffusion co-efficient of a metal in a solid solution depends upon its

Also checkout

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³) while the C.V. is same on weight basis (i.e., kcal/kg)?