Related Questions
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The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the
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A jig is used while __________ a hole.
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4
Secondary hardening in steels arises out of the
A. Precipitation of fine alloy carbides at high temperatures
B. Refinement of ferrite grain size by working
C. Decomposition of retained austenite upon heat treatment
D. Precipitation of complex inter-metallic upon heat treatment
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4
The activity co-efficient of the solute in a dilute solution
A. Decreases with the increase of concentration of the solute
B. Increases with the increase of concentration of the solute
D. Is unity at infinite dilution
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4
Increase in temperature, in general results in the
A. Decrease in the viscosities of both liquids & gases
B. Increase in the viscosities of both liquids & gases
C. Increase in the viscosity of liquids and decrease in that of gases
D. Decrease in the viscosity of liquids and increase in that of gases
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4
The burnout heat flux in the nucleate boiling regime is not a function of the
C. Temperature difference
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The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is
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The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.
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4
Copper deposits are found in India at the following location:
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Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.
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4
At 100% relative humidity, the dew point temperature of moist air is
A. Less than the wet bulb temperature
B. More than the wet bulb temperature
C. Equal to the wet bulb temperature
D. Equal to the ambient temperature
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4
With increase in steam pressure, its specific volume decreases
A. Rapidly first and then slowly
C. Slowly first and then rapidly
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Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are:
A. Nickel, cobalt & chromium
B. Tungsten, chromium & cobalt
C. Manganese, chromium & cobalt
D. Tungsten, molybdenum & nickel
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Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.
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4
Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of
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4
Oxide layer formed on the non-ferrous metal surface after its annealing is
A. Removed by acid pickling
B. Hammered into the surface
C. Removed with coarse emery cloth
D. Left as such to protect the surface
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4
Moist climate is the most favourable factor in the site selection far a
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Out of the following __________ iron has the best capability to bear sudden & excessive shocks.
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Silicon crystal can be converted to p-type semiconductor by doping with
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Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same
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Materials having resistivity ranging from 1 to 100 ohm. cm is termed as
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Glass reacts with
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Which of the following materials has the poorest electrical conductivity?
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One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W. m- 1. k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is
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4
The condition of diffraction from a crystal is given by
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The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then
A. Wet bulb temperature=dry bulb temperature
B. Wet bulb temperature=dew point temperature
C. Saturation temperature=dew point temperature
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Force between the molecules of the same substance is called __________ force.
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For the irreversible reaction, Ca+ 2C = Ca C2 , Δ H°298 = - 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be
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__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.
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For separating small pieces of metal from engine oil of a car, the best separating technique is the
D. Fractional distillation