Explore topic-wise MCQs in Engineering.

Resistance to slag attack of a refractory

Grog

Chromite refractories

Test piece for determination of RUL of a refractory is heated in a/an

Magnesite refractories are used for the construction of those furnaces, which are

Roof of a basic electric furnace is made of __________ bricks.

Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ C.

An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?

Which is the stable form of silica below 870 C ?

Refractoriness of a typical silica brick corresponds to Segar cone number, '32', which is equivalent to a temperature of __________ C.

Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900 C ) use, except

Firing of refractory brick is done to

Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called

Panel test determines the __________ of refractories.

Fusion point of a basic refractory material is

RUL of refractories depends on the

Which is the stable form of silica between 1470 C and the melting point 1713 C ?

Magnesite bricks are used in those parts of furnaces, which are

Which is not a basic refractory ?

Thoria

Which property of refractories is the most important for top section of the blast furnace?

With increase in the alumina content, the refractoriness of high alumina refractories

A steel member used in the furnace construction to take the thrust of the brickwork is called

With increase in the porosity, thermal spalling resistance of fireclay brick

Maximum alumina content in high alumina refractory can be as high as __________ percent.

On an average __________ fast neutrons are produced by nuclear fission of each atom of uranium-235.

Stellite is a trade name for the

High __________ of cast iron makes it suitable for use in machine beds.

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

Wrought iron is not

Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of

The ratio of the shear stress to the principal stress on a principal plane is

Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam.

Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of

__________ welding will be the most suitable for butt welding two 20 cms thick boiler drum mild steel plates.

Three elastic constants for a completely anisotropic elastic material which follows the Hooke's law are young's modulus, elastic limit stress and yield stress. Which of the following properties is most sensitive to increase in strain rate ?

High endurance limit of carburised machine parts is because of the fact that carburisation

Out of the following materials, the one which generally exhibits an yield point is

Carbon is present in the form of __________ in grey cast iron.

Lap joints are preferred over butt joints in soldering/brazing, because these joints are

Lead is most readily dissolved in

Toughness of a material is measured by the

The most abundant metal present in the earth's crust is;

Pressure gauges are never connected directly to the live steam line; rather a loop or syphon is interposed as close as possible to the pressure gauge. This is done to

The gases used in the treatment of asthma is a mixture of __________ and oxygen.

Solute atoms which cause yield point phenomenon in mild steel are/is

Thermit welding is categorised as the __________ welding.

In case of a, centrifugal pump, the ratio h₁/h₂ is termed as the __________ efficiency (where, h₁ = actual measured head & h₂ = head imparted to the fluid by impeller).

Runga-Kutta method is used to solve a/an

Firing temperature of magnesite bricks is about __________ C.