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Which of the following is an acidic constituent of B.F. slag?

A.

B. FeO

C. MgO

D. CaO

Correct Answer :

A.


Related Questions

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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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Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position.

A. Horizontal

B. Vertical

C. Inclined

D. Any

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Which of the following is resistant to the action of both heat & chemicals?

A. Borosilicate glass

B. Silica glass

C. Soda lime glass

D. None of these

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Resilience of a bolt can be increased by increasing its

A. Length

B. Shank diameter

C. Head diameter

D. None of these

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During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to

A. Time

B. Square root of time

C. Square of time

D. Cube of time

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Cold chisels hammers are made of

A. High speed steel

B. High carbon steel

C. Forged steel

D. Mild steel

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Minimum thermal efficiency of a steam boiler may be around __________ percent

A. 25

B. 45

C. 65

D. 20

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Factor of safety is the ratio of the __________ stress to the working stress.

A. Tensile

B. Compressive

C. Yield

D. Bearing

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Coarse grained steels have

A. Low toughness

B. No tendency to distort

C. High density

D. Very high toughness

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Rankine cycle comprises of two isothermal and two __________ processes.

A. Isobaric

B. Polytropic

C. Isentropic

D. None of these

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Water hammer is caused in steam carrying pipelines, because of

A. Partial condensation of steam

B. Vibration of the pipeline

C. High degree of superheat of steam

D. Its exposure to torrential rain

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In troposphere (the weather domain), the temperature 't' at height 'h' above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

A. t = 15 - 0.0065 h

B. t = 15 + 0.0065 h

C. t = 0.0035 h - 15

D. t = 15 - 0.0035 h

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Which of the following is not categorised as the ore agglomeration process?

A. Nodulising

B. Pelletising

C. Balling

D. Briquetting

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Inertial forces are obtained, when the elastic forces are multiplied by __________ number.

A. Mach

B. Froude

C. Reynolds

D. Euler

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Which of the following is a boiler accessory
i.e., not a boiler mounting?

A. Blow off cock

B. Feed check valve

C. Feed water pump

D. Stop valve

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__________ is the most suitable lubricant for drawing mild steel wires?

A. Kerosene

B. Water

C. Sodium stearate

D. Lime water

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4

Brinell Hardness Number (BHN) for talc is approximately in the range of

A. 1-5

B. 20-30

C. 100-150

D. 200-250

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The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the

A. Ability to absorb shock

B. Capacity to store energy

C. Ratio of the wire & coil diameters

D. Load to produce unit deflection

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A psychrometer does not measure the __________ temperature of moist air.

A. Dew point

B. Dry bulb

C. Wet bulb

D. None of these

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A spring material should have low

A. Elastic limit

B. Deflection value

C. Fatigue resistance

D. None of these

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The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.

A. 768

B. 1127

C. 1359

D. 1480

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Pick out the wrong statement.

A. Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly caused by the formation and coalescence of voids in the necked region

B. Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation

C. Fatigue fracture of a material is always brittle in nature and takes place due to the existence of line imperfections

D. Brittle materials are generally tested in tension

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In connection with corrosion of metals, passivation is the process that

A. Intensifies deterioration

B. Changes the composition of the metal

C. Inhibits further deterioration

D. None of these

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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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Gantt charts are used for streamlining the

A. Inventory control

B. Production schedule

C. Sales forecasting

D. Quality control

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Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the

A. Length of the pipe

B. Diameter of the pipe

C. Density of the fluid

D. Velocity of the fluid

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Plastics as a material of construction suffer from the drawback of low

A. Machinability

B. Density

C. Strength

D. Plastic deformation

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The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.

A. Creep

B. Endurance

C. Fatigue

D. None of these

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The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm.

A. 0.001

B. 0.01

C. 0.002

D. 0.02

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Maraging steels derive their strength from the following mechanism:

A. A fine, highly dislocated and strong martensite

B. Fine dispersions of inter-metallic of Fe, Ni, Ti etc

C. Fine dispersions of alloy carbides in a ferrite matrix

D. Fine dispersions of C nucleated on dislocations in austenite