Related Questions
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The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)
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4
The order of a chemical reaction
A. Can be determined only experimentally
B. Can be determined from the stoichiometry of the reaction
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Atomic __________ is a whole number for an element.
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Maximum permissible air velocity in pipelines is about __________ metre/second.
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A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2.
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Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
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4
Fibre reinforced plastic (FRP) are
A. Made of glass fibre and thermoplastic resins
C. Made of thermosetting resin and glass fibre
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Super conduction in metals is observed at a temperature of __________ °K.
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At absolute zero temperature, for any reaction involving condensed phases
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A spring material should have low
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Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C.
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Materials having resistivity ranging from 1 to 100 ohm. cm is termed as
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Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.
A. Induced draft fan
B. Economiser
C. Air preheater
D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories?
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4
Fine grained steels have
B. Higher tendency to distort
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Air intake for an air compressor should be preferably taken from
A. A site, where cooling towers are located nearby
B. A site, where open coal yard in located nearby
C. An air conditioned room maintained at a temperature of 18°C
D. An outside atmosphere at 10°C
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4
Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.
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Compressed dry air is used as the cutting fluid, while machining
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In the Bayer's process, bauxite is digested under pressure using
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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.)
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4
Pick out the wrong statement.
A. Geothermal energy is a non-conventional source of energy
B. Mass is converted into energy in both nuclear fission & fusion reaction
C. Inhalation of mercury vapour is not harmful for human beings
D. Inhalation of arsenic causes cancer
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The most detrimental impurity in high pressure boiler feed water is
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The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.
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Absolute zero pressure can be attained at a temperature of
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Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as
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An approximately __________ process exemplifies the flow of a gas through a very long pipe of uniform cross-section.
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M10 index of coke indicates its
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Silicon in steel
A. Makes it usable in almost all magnetic circuits where alternating current is used
B. Increases its electrical resistivity and decreases the hysteresis loss
C. Is present upto 5% & 4% respectively when used in transformers & motor armatures
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4
Transformer cores are normally made from
C. Grain oriented Fe-Si alloy
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Ganister contains maximum percentage of
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Pick out the wrong statement.
A. Cold cracking of a weld is due to the presence of hydrogen gas in the weld
B. True stress is given by, σ = σE (1 + εE), where σE and εE are engineering stress and engineering strain respectively
C. Phosphorous can be easily recovered in the iron blast furnace
D. High residual stress at the surface is beneficial for fatigue properties of a material