Related Questions
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4
The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is
D. More but less than the diameter of bolt
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4
Angular displacement can be measured suitably by a
B. Linear variable differential transducer (LVDT)
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What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.
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4
Material of construction of the electrode used in the electric resistance welding is
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With increase in temperature, the electrical conductivity of semiconductors
D. Either (A) or (B), depends on the type of semi-conductor
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A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons.
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Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than
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A jet engine turbine blade is normally manufactured by
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In the Bayer's process, bauxite is digested under pressure using
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In the acid Bessemer process, the hot metal should have the following composition.
A. S < 0.05% and P < 0.05%
B. S < 0.05% and P < 1.5%
C. S < 0.05% and P > 1.5%
D. S > 1.5% and P < 0.05%
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4
Cascade control is
A. The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller
B. Used when changes in process conditions cause serious upsets in the controlled variable
C. Useful to control flow from temperature
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Colour comparator is used to measure the
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Evaporative cooling process employs a combination of cooling and humidification in which the
A. Sensible heat is added
B. Sensible heat is removed and the latent heat is added
C. Latent heat is removed
D. Sensible heat is added and latent heat is removed
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A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec2 is
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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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Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per of steel strip.
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The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.
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__________ stress cannot be sustained by a fluid in equilibrium.
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Pick out the wrong statement.
A. Weldability of high carbon steel is poorer compared to low carbon steel
B. Invar is a magnetic alloy
C. Magnetic permeability of the diamagnetic material is less than one
D. Martenistic transformation never goes to completion (i.e., 100%) at room temperature
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Which of the following materials has the least scrap value?
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Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?
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The thickness of oxide film is y at time t. If are the temperature dependent constants, the parabolic law of oxidation is given by
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More than 95% of __________ is present in corundum.
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The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
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Laser welding is widely employed in the __________ industries.
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Reduction in the grain size reduces the __________ of the material.
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Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is
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In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of
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Hydro-cyclone is a
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Which of the following fastening devices has a head at one end and a nut fitted to the other?