The approximate height of a blast furnace having a useful volume ofm3 is about __________ metres
Air standard Otto cycle is more efficient than the diesel cycle for the same
In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.
Stellite is a __________ material.
Most of the phosphorous present in the blast furnace burden enters into
During sensible heating of humid air
The most important requirement for aluminium industry is the availability of cheap
Spheriodising of a material is a/an __________ process.
Most important property of steels for use in automobile bodies is the
Consideration of the creep is the most important in case of the
The driving force for the sintering of a powder compact is
When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively
Preheating before welding is done to
Catalyst used in the catalytic converter employed in automobiles to convert CO into CO and for complete oxidation of un-burnt hydrocarbons is
Spark plug is provided in a/an
Which of the following gases cause global warming ?
Rankine cycle comprises of two isothermal and two __________ processes.
Desalination of water
Viscoelastic behaviour is observed in __________ materials.
Temperature attained in soldering of metals is about __________ °C.
Pick out the correct statement.
Thermal conductivity of a material does not depend upon its
Multistage compression is necessary for high efficiency,
A freely floating object is stable, if its centre of buoyancy
Which of the following heat treatment processes is usually applied to castings ?
Nusselt number/Biot number varies
Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
The cathode in an electrochemical cell always carries
A suitable lubricant used for watches is
Percentage of argon (by volume) in dry atmospheric air is about
The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.
Limestone addition in the blast furnace is done to flux __________ present in the raw materials.
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
Dew point temperature always gives an indication of the __________ of the moist air.
For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot ?
Oxyacetylene reducing flame is used while carrying out welding on
Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as
Multistage compression of air as compared to single stage compression offers the advantage of
Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation
The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.
If a solid is compressed adiabatically in its elastic range, its __________ remains constat
The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.
Notched bar test is used for testing the __________ of a material.
Glass reacts with
__________ can not increase the fatigue strength of a material.
If the head is doubled in & centrifugal pump, the power required will increase in the ratio of
Which of the following materials does not form adherent oxide film on surface ?
Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type
An oxidation process is accompanied with decrease in the