Related Questions
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Neutrons are present in all atoms except that of
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Which of the following heat treatment processes is usually applied to castings?
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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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4
Softening of hardened steel is done by its
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The unit of gc is
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The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be
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4
Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot
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4
Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode
A. Occurs higher in the electro-chemical series of metals
B. Is exemplified by magnesium plate
C. Is much cheaper than the cathodic base material to be guarded against corrosion
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Which of the following rays has the least wavelength?
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Which of the following material handling equipments is not suitable for moving materials in varying paths?
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Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.
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__________ iron is produced by the annealing of white cast iron.
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__________ cannot increase the fatigue strength of a material.
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Particle nature of cathode rays is proved due to the fact that they
A. Travel in a straight line
B. Get deflected by magnetic electric field
D. Heat the exposed material
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Which of the following is the largest quantum of pressure?
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Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.
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Removal of non-condensable from steam or other vapour is termed as the __________ process.
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High speed steel tools retain their hardness upto a temperature of __________ °C.
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Diamagnetic materials
A. Are magnetised by eddy currents only
B. Are non-magnetic and cannot be magnetised
C. Are magnetised in direction opposite to the magnetic field
D. Can be magnetised in one direction only
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__________ of austenite decreases the hardenability in steel.
D. Dissolved elements (except cobalt)
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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
Most important property of steels for use in automobile bodies is the
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The activity of pure hydrogen gas at 1000°C and 5 atm pressure
B. Is always greater than 1
D. Depends on the choice of the standard state
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Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.
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Yield strength of a polycrystalline metal with an average grain size d, is proportional to
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The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.
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The mechanism involved in the removal of metal in drilling operation is by
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LVDT used for displacement measurement is a/an __________ transducer.
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__________ stress cannot be sustained by a fluid in equilibrium.
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Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.