| Dislocations are _______________ defects? |
| A. Point B. Line C. Volume D. None of these |
| The minimum carbon content in steel should be ____________________ percent for it to respond to a hardening treatment ?A. 0.2 B. 0.4 C. 0.6 D. 0.8 |
| Which one of the following is incombustible ? |
| A. H2 B. CCl4 C. C2H2 D. S |
| As the fluid flow rate increases, the float of the Rotameter____________________? |
| A. Rises in the tube B. Rotates at higher speed C. Rotates at lower speed D. Drops down in the tube |
| High speed steel tools retain their hardness upto a temperature of __________________ °C? |
| A. 500 B. 750 C. 900 D. 1100 |
| Transformation range for ferrous material is the temperature interval during which ___________________ is formed during its heating? |
| A. Cementite B. Austenite C. Martensite D. Pearlite |
| Which of the following is not a charge material for cupola ? |
| A. Limestone B. Iron scrap C. Iron ore D. Pig iron |
| Sudden fall of atmospheric pressure by a large amount is an indication of the_____________________? |
| A. Rain B. Cold wave C. Storm D. Fair weather |
| _____________________ of grey cast iron produces white cast iron? |
| A. Tempering B. Rapid heating C. Rapid cooling D. Slow cooling |
| Stainless steel is welded with difficulty because of____________________? |
| A. Its high melting temperature B. Chances of cracking C. Oxide film formation D. Chromium carbide formation |
| 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 ? |
| A. Hard B. Soft C. Silicon carbide D. Aluminium oxide |
| What is the value of entropy at 273°K ? |
| A. 0 B. 1 C. ∞ D. None of these |
| Vernier calipers cannot be used to measure the______________________? |
| A. I.D. & O.D. of the shaft B. Thickness of parts C. Depth of holes D. Clearance between two mating surfaces |
| Powder metallurgy process does not make metal powder by_________________________? |
| A. Atomisation B. Grinding/milling C. Hammering D. Electrolytic deposition |
| With increase in steam pressure, its specific volume decreases ____________________? |
| A. Rapidly first and then slowly B. Linearly C. Slowly first and then rapidly D. Exponentially |
| Wrought iron is not____________________? |
| A. Ductile & resistant to corrosion/rusting B. Weldable easily C. Having uniform strength in all directions D. Having maximum tensile strength along the lines of slag distribution |
| Cast iron contains ____________________ percent carbon? |
| A. 2.5 B. 3.75 C. 4.75 D. 5.25 |
| Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of ? |
| A. Grashoff number B. Grashoff number & Reynolds number C. Reynolds number D. Grashoff number & Prandtl number |
| Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ? |
| A. Emissivity of pipe surface B. Diameter & length of the pipe C. Temperature of hot pipe surface & that of air in the room D. None of these |
| Ammonia leakage in the refrigeration system is detected by_________________? |
| A. Sulphur stick, which on detection gives white smoke B. Using chemical reagents C. Its smell D. Soap solution |
| Blast furnace slag is mainly molten_________________? |
| A. Sand B. Magnesium silicate C. Calcium silicate D. Iron pyrite |
| The best lubricants for a machine working at high temperature & load is_________________? |
| A. Grease B. Solid lubricant C. Animal oils D. Mineral oils |
| A high pressure boiler generates steam at a pressure greater than _____________________ kg/cm2 ? |
| A. 10 B. 30 C. 50 D. 80 |
| Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is ______________ Nm3 ? |
| A. 0.5 B. 1 C. 1/3 D. 2.5 |
| Titanium is added to molten aluminium alloys before casting for the purpose of_____________________? |
| A. Grain refinement B. Increasing corrosion resistance C. Reducing porosity D. Improving fluidity |
| Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as_________________? |
| A. Gr0.25, Gr B. Gr0.25, Gr0.33 C. Gr, Gr0.25 D. Gr0.33, Gr0.25 |
| Angular displacement can be measured suitably by a______________________? |
| A. Shaft encoder B. Linear variable differential transducer (LVDT) C. Stroboscope D. Tachometer |
| Maximum hardenability of steel depends upon its_______________________? |
| A. Chemical composition B. Carbon content C. Grain size D. Alloying elements content |
| Electrical conductivities of semi-conductors are of the order of ______________ ohm/cm ? |
| A. 10-3 B. 103 C. 10-15 D. 1015 |
| The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of ______________ mm ? |
| A. 0.001 B. 0.01 C. 0.002 D. 0.02 |
| Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________? |
| A. Tempering B. Hardening C. Annealing D. Normalising |
| 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 |
| Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by_________________? |
| A. Conduction B. Convection C. Radiation D. Both A. & B. |
| Nitriding of a steel part does not increase its__________________? |
| A. Grain size B. Fatigue limit C. Surface hardness D. Wear resistance |
| Chromium molybdenum steel cannot be welded using ______________ welding ? |
| A. Thermit B. Electrical resistance C. Oxy-acetylene D. Any of these |
| Which of the following fastening devices has a head at one end and a nut fitted to the other ? |
| A. Bolt B. Stud C. Top bolt D. None of these |
| The elastic strain in copper is due to the__________________? |
| A. Motion of dislocations B. Stretching of atomic bonds C. Breakage of atomic bonds D. None of the above |
| Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the ______________ temperature of air? |
| A. Wet bulb B. Dry bulb C. Saturation D. Dew point |
| Factor of safety in machine design is defined as the ratio of ultimate stress to _____________ stress ? |
| A. Working B. Bearing C. Yield D. None of these |
| Speisses is a mixture of the following ? |
| A. Arsenides of heavy metals B. Antimonides of heavy metals C. Arsenides & antimonides of heavy metals D. Iron, cobalt and nickel |
| The difference between gross & net calorific values of fuel is due to the___________________? |
| A. Sensible heat carried away by the flue gases B. Heat carried away by the steam from the moisture content of the fuel C. Heat lost by radiation D. Heat carried away by steam from the combustion of hydrogen in the fuel |
| The starting of a car takes time in winter, because the__________________? |
| A. Octane number of fuel is decreased B. Fuel supply for ignition is not sufficient C. Vaporisation of the fuel is decreased D. Pour point of fuel decreases |
| Pressure required to increase the density of water by about 1% is ____________________ atmosphere? |
| A. 10 B. 50 C. 200 D. 1000 |
| If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity_________________? |
| A. Is trebled B. Remains unchanged C. Decreases by a factor of 3 D. Decreases by a factor of 1/3 |
| A dense structure of grinding wheel is not used for the_____________________? |
| A. Ductile material B. Hard materials C. Brittle materials D. Finishing cuts |
| Direct conversion of thermal energy to electrical energy is facilitated by the____________________? |
| A. Fuel cells B. Photo voltaic cell C. Magneto hydrodynamic generator D. None of these |
| Annealing of white cast iron produces _____________________ iron? |
| A. Grey B. Nodular C. Malleable D. Spheroidal |
| Cemented carbide tools are not suitable for cutting___________________? |
| A. Aluminium B. Brass C. Cast iron D. Steel |
| Milk is fat dispersed in water. It is an example of__________________? |
| A. Suspension B. Emulsion C. Gel D. Solution |
| Case hardening of a material is__________________? |
| A. Followed by tempering or carburising B. Preceded by its tempering C. Done to get a soft ductile interior with a very hard surface D. Carried out to get extreme hardness in its core |
| According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point is__________________? |
| A. 180° B. 212° C. 32° D. 273° |
| Energy of the sun arises mainly from __________________ reactions? |
| A. Fusion B. Fission C. Combustion D. None of these |
| The phenomenon occurring during explosion of a hydrogen bomb is___________________? |
| A. Nuclear fission B. Nuclear fusion C. A combination of both nuclear fission & fusion D. None of these |
| Which of the following has the highest value of refractive index ? |
| A. Brine (sea water) B. Diamond C. Distilled water D. Glass |
| Resistance of an electrical conductor is proportional to its (where, l = length and A = crosssectional area of the conductor)________________? |
| A. A B. l C. A2 D. Both A. & B. |
| Thermit welding uses the following energy source ? |
| A. Electrical energy B. Chemical energy C. Energy of high velocity electrons D. Heat generated by friction |
| An alloy of Fe – 0.4 % C is__________________? |
| A. Cast iron B. Hypo-eutectoid steel C. Hyper-eutectoid steel D. Eutectoid steel |
| Out of the following, the ________________ pipe has the least corrosion resistance? |
| A. Mild steel B. Copper C. Cast iron D. Wrought iron |
| 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_______________? |
| A. Parabolic B. Hyperbolic C. Straight line D. None of these |
| Lead is poured into the joints between two ___________________ pipes? |
| A. Cast iron B. Steel C. Concrete D. Plastic |
| Reduction in the grain size reduces the _________________ of the material? |
| A. Fatigue resistance B. Tensile strength C. Creep resistance D. All A, B. & C |
| Wrought iron is never shaped by__________________? |
| A. Casting B. Cold working C. Forging D. Welding |
| Mild steel has _______________ crystal lattice structure? |
| A. Face centred cubic (fcc) B. Body centred cubic (bcc) C. Orthorhombic D. Cubic |
| Diffusion co-efficient of a metal in a solid solution depends upon its ? |
| A. Composition B. Temperature C. Both A. & B. D. Neither A. nor B. |
| The following type of bonding is strongly directional in solids ? |
| A. Vander Waal’s B. Ionic C. Metallic D. Covalent |
| Which of the following is not a principal alloying element for the structural steel ? |
| A. Molybdenum B. Nickel C. Manganese D. Chromium |
| Which of the following rays has the least wavelength ? |
| A. Ultraviolet rays B. Infrared rays C. Cosmic rays D. X-rays |
| Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when_________________? |
| A. Strain rate is increased B. Grain size is increased C. Prior cold deformation is increased D. Not affected by any of the above parameters |
| Corrosion of metals cannot be prevented by its__________________? |
| A. Tempering B. Chromising C. Aluminising D. Alloying |
| Absolute zero pressure can be attained at a temperature of___________________? |
| A. 0°C B. 50°K C. 0°R D. None of these |
| Recrystallisation temperature of steel is ______________________ °C? |
| A. 50 B. 300 C. 500 D. 800 |
| Which of the following does not have a sharp melting point ? |
| A. Thoria B. Glass C. Ice D. Pig iron |
| The usual energy consumption in electric arc furnace steel making is _____________ KWh/ton of steel ? |
| 0 |
| A. 60 – 100 B. 400 – 700 C. 1200 -1500 D. 2000 – 2300 |
| On being hit with a hammer, ___________________ will readily fracture? |
| A. Brass B. Mild steel C. Cast iron D. Lead |
| Nuclear fission of one atom of uranium-235 produces the energy equivalent to about ____________ MeV? |
| A. 20 B. 200 C. 500 D. 2000 |
| 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____________________? |
| A. 100 B. 900 C. 9000 D. 10000 |
| Fibre glass is a composite material of_________________? |
| A. Glass fibre in a polymer matrix B. Glass fibre in a metallic matrix C. Polymer fibre in a glassy matrix D. Both ‘b’ & ‘c’ |
| Stainless steel is welded using__________________? |
| A. Oxy-acetylene flame B. Oxy-hydrogen flame C. Arc welding D. Inert gas arc welding |
| All of the following alloying elements of steel increases hardness but sacrifice ductility, except________________? |
| A. Nickel B. Vanadium C. Molybdenum D. Chromium |
| The maximum thickness of the metal which can be welded using ultrasonic welding is _____________ mm ? |
| A. 0.5 B. 3 C. 10 D. 25 |
| The best guide to judge the general quality of water is the measurement of its__________________? |
| A. pH value B. Electrical conductivity C. Turbidity D. Dissolved oxygen content |
| A material in which the atoms are arranged regularly in some directions but not in others, is termed as ‘mesomorphous material’; an example of which is_________________? |
| A. Lead B. Glass C. Mica D. Silver |
| In case of simple harmonic motion, displacement is proportional to the_________________? |
| A. Velocity B. Acceleration C. Both A. & B. D. Neither A. nor B. |
| Which of the following is preferred for riveting ? |
| A. Lap joint B. Butt joint C. Either A. or B. D. Neither A. nor B. |
| Friction factor for fluid flow in pipe does not depend upon the________________? |
| A. Pipe length B. Pipe roughness C. Fluid density & viscosity D. Mass flow rate of fluid |
| Alloys having more than 80% copper are generally more______________________? |
| A. Abrasion resistant B. Corrosion resistant C. Prone to season cracking D. Machinable |
| __________________ is used for tying the steel columns to concrete foundation? |
| A. Grouting B. Eyebolt C. Anchor bolts D. Refractory castables |
| Cobalt – 60 is used as a source of _____________ in medical therapy & industrial radiography? |
| A. X-rays B. γ-rays C. α-rays D. β-rays |
| _______________ is the hardest oxide and is hence used where high wear resistance at high temperature is required? |
| A. Beryllium B. Zirconia C. Alumina D. Magnesia |
| For preparation of porous bearings by powder metallurgy, preferred particle shape is___________________? |
| A. Spherical B. Nodular C. Irregular D. No preferred shape |
| The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is ______________ BTU/hr? |
| A. 100 B. 200 C. 1000 D. 2000 |
| Tin based white metals are used, where bearings are subjected to___________________? |
| A. High pressure & load B. Low pressure & load C. High temperature D. Large surface wear |
| Hydro-cyclone is a____________________? |
| A. Crusher B. wet classifier C. Dry classifier D. Magnetic separator |
| Which of the following does not discharge the dust collected as a dry solid? |
| A. Electrostatic precipitator B. Wet scrubber C. Bag filter D. Gravity settling chamber |
| The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the_________________? |
| A. Pipe roughness & pipe diameter B. Fluid velocity C. Type of flowing fluid D. Both B. & C. |
| A solar cell converts the sunlight directly into ______________ energy? |
| A. Thermal B. Electrical C. Mechanical D. Chemical |
| In extrusion of metals, which of the following statement is true ? |
| A. Speed of the extruded material is same as that of ram speed B. Redundant work is a function of the die angle C. Relative motion between the billet surface and the container wall is always present D. Hollow ram is used for indirect extrusion |
| X-rays are__________________? |
| A. Positively charged B. Negatively charged C. Neutral D. Of higher wavelength than visible light |
| Wrought iron does not have__________________? |
| A. Uniform strength in all directions B. Ability to hold protective coating C. High ductility & corrosion resistance D. Easily weldable characteristics |
| Square steel key is normally strong in failure by shear & crushing. Keys are normally made of _______________ steel bars? |
| A. Hot rolled mild B. Cold rolled mild C. Forged D. Machinable stainless |
| A jet engine turbine blade is normally manufactured by____________________? |
| A. Forging B. Shell moulding C. Investment casting D. Pressure die casting |
| Fog is an example of colloidal system of___________________? |
| A. Solid dispersed in gas B. Solid dispersed in liquid C. Liquid dispersed in gas D. Gas dispersed in liquid |
| _________________ is the most suitable lubricant for drawing mild steel wires? |
| A. Kerosene B. Water C. Sodium stearate D. Lime water |
| Use of flux during soldering is done to__________________? |
| A. Increase fluidity of solder by lowering its melting temperature B. Prevent oxide formation C. Wash away surplus solder D. Full up the joint gap |
| Metalloids________________? |
| A. Are good conductor of heat & electricity B. Act as electron donors with metals & as electron acceptor with non-metals C. Are not necessarily solids at room temperature D. Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron |
| If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a _____________ reactor? |
| A. Critical B. Breeder C. Fertile D. Heterogeneous |
| Aluminium is extracted from____________________? |
| A. Chalcocite B. Bauxite C. Galena D. None of these |
| Out of the following, the joint produced by ______________ has the lowest strength? |
| A. Soldering B. Welding C. Brazing D. Riveting |
| Copper deposits are found in India at the following location ? |
| A. Kudremukh B. Kolar C. Khetri D. Ramagundam |
| Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore ? |
| A. High fusibility & fluidity B. High thermal conductivity C. Low density D. High chemical activity |
| Dies for wire drawing are generally made of__________________? |
| A. Mild steel B. Stainless steel C. Carbides D. High carbon steel |
| Maximum consumption of limestone is in the ____________________ industry? |
| A. Iron and steel B. Cement C. Glass D. Fertiliser |
| ‘Ice point’ is designated on Fahrenheit temperature scale by__________________? |
| A. 0° B. 32° C. 62° D. 212° |
| Which of the following is not an explosive ? |
| A. TNT B. CMC C. RDX D. Lead azide |
| The most important consideration in value engineering is the_____________________? |
| A. Profit maximisation B. Customer satisfaction C. Cost reduction D. Process improvement |
| __________________ fluid force is not considered in the Navier-Stokes equation? |
| A. Turbulent B. Viscous C. Gravity D. Pressure |
| Auto collimator is used to check____________________? |
| A. Flatness B. Angle C. Rotor balancing D. Roughness |
| ____________________ are normally subjected to sub-zero treatment? |
| A. Highly stressed parts B. Gauges or precision parts C. Cold rolled sheets D. Non machinable materials |
| Steel balls are manufactured by_____________________? |
| A. Sintering B. Casting C. Cold heading D. Spinning |
| In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that ? |
| A. Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller B. Maintaining vacuum on tube side is more difficult than that on the shell side C. Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam D. Condenser can act as a storage unit for condensed steam |
| Wood is a/an ______________ material ? |
| A. Amorphous B. Cellular C. Homogeneous D. Granular |
| Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories ? |
| A. A, C, B, D B. D, B, C, A C. D, C, B, A D. D, A, B, C |
| Induced draft fans provided in large thermal power plant boilers have __________________ blades? |
| A. Forward curved B. Backward curved C. Double curved D. Radial or straight |
| 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.) ? |
| A. t = 15 – 0.0065 h B. t = 15 + 0.0065 h C. t = 0.0035 h – 15 D. t = 15 – 0.0035 h |
| Work done by a/an _________________ process is determined by ∫p. dv ? |
| A. Adiabatic B. Quasi-static C. Isothermal D. Isentropic |
| Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about _______________ percent ? |
| A. 1 B. 10 C. 30 D. 50 |
| The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is__________________? |
| A. Magnesite B. Chrome C. Silica D. Fireclay |
| ______________________ temperature remains constant during adiabatic saturation process of unsaturated air ? |
| A. Dew point B. Dry bulb C. Wet bulb D. None of these |
| Resilience of a bolt can be increased by increasing its __________________? |
| A. Length B. Shank diameter C. Head diameter D. None of these |
| Maximum permissible air velocity in pipelines is about ______________ metre/second ? |
| A. 5 B. 10 C. 20 D. 40 |
| Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA) ? |
| A. Styrofoam B. Lucite C. Perspex D. Plexiglass |
| Elimination of brittleness resulting from welding of saw blades is done by __________________ of the welded portion ? |
| A. Annealing B. Toughening C. Work hardening D. Tempering |
| In a neutral solution__________________? |
| A. H+ ions are absent B. OH- ions are absent C. Both H+ and OH- ions are present in very small but equal concentration D. None of these |
| 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 |
| ____________________ of hard alloy and tool steel is done to make it easily machinable ? |
| A. Case carburising B. Tempering C. Normalising D. Annealing |
| In the Bayer’s process, bauxite is digested under pressure using ___________________? |
| A. H2SO4 B. NaOH C. NH3 D. HCl |
| Closeness of packing is maximum in case of ____________________ crystal lattice? |
| A. Face centred B. Simple cubic C. Body centred D. None of these |
| Brittleness induced due to the presence of sulphur in steel can be reduced by adding______________? |
| A. Manganese B. Magnesium C. Vanadium D. Copper |
| 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 ? |
| A. Temperature – entropy B. Temperature – pressure C. Enthalpy – entropy D. Enthalpy-pressure |
| The hardenability of steel decreases with__________________? |
| A. Decrease in dislocation density B. Increase in solutionising temperature C. Increase in strength D. Decrease in grain size |
| 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 |
| What is the value of included angle of a triangular notch for maximum discharge ? |
| A. 30° B. 60° C. 90° D. 120° |
| Which of the following is a boiler accessory i.e., not a boiler mounting ? |
| A. Blow off cock B. Feed check valve C. Feed water pump D. Stop valve |
| The most important requirement for aluminium industry is the availability of cheap _______________? |
| A. Ore B. Electrical power C. Labour D. Abundant water |
| Steel containing low percentage of nickel, chromium & tungsten are termed as the _____________ steel ? |
| A. Wrought B. Tool C. Alloy D. Plain carbon |
| Materials having resistivity ranging from 1 to 100 ohm. cm is termed as___________________? |
| A. Conductor B. Insulator C. Semi-conductor D. None of these |
| Plasma is_____________________? |
| A. A high temperature neutral gas B. Nothing but ionised gas C. A source of steady and highest controllable pressure D. Formed at very low temperature |
| Heat flow across a hollow sphere of inner radius ‘r1’ and outer radius ‘r2’ is directly proportional to__________________? |
| A. (r2 – r1)/r1. r2 B. r1. r2/(r2 – r1) C. (r2 + r1)/r1. r2 D. r1. r2/(r2 + r1) |
| Tempering of a material does not improve its____________________? |
| A. Machinability B. Toughness C. Internal stress level D. Softness |
| In connection with corrosion of metals, passivation is the process that__________________? |
| A. Intensifies deterioration B. Changes the composition of the metal C. Inhibits further deterioration D. None of these |
| On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the ______________ of the input signal? |
| A. Frequency B. Amplitude C. Damping D. None of these |
| Which of the following forces does not act on a fluid at rest ? |
| A. Viscous force B. Gravity force C. Hydrostatic force D. Surface tension force |
| Cold cracking in the heat affected zone of a high strength steel weld can take place because of the___________________? |
| A. Retained austenite B. Martensite formation C. Relatively high sulphur content in the base metal D. Sufficient hydrogen present in the welding arc |
| Moist climate is the most favourable factor in the site selection far a_________________? |
| A. Steel plant B. Textile factory C. Petroleum refinery D. Coke oven battery |
| 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__________________? |
| A. More B. Less C. Same D. More but less than the diameter of bolt |
| Powder metallurgy is used to produce__________________? |
| A. High precision components with complex cavities and sharp features B. Components of large size C. Porosity free components D. Components of such alloys whose constituents do not form alloys readily |
| Primary designation of steel is based on its__________________? |
| A. Hardness & tensile strength B. Carbon content C. Iron content D. Alloying elements content |
| Wohler test is a destructive test to find out the ___________________ strength of a prepared metal specimen ? |
| A. Creep B. Fatigue C. Endurance D. Tensile |
| The temperature at which ferromagnetic material can no longer be magnetized by the outside forces, is termed as the____________________? |
| A. Critical point B. Curie temperature C. Inversion temperature D. Eutectic temperature |
| The two elements required to form substitutional solid solution should not have___________________? |
| A. Same crystalline structure B. Same valency C. Widely differing electronegativity D. Same atomic sizes |
| ____________ test is the appropriate test to determine whether a material is ductile or brittle ? |
| A. Impact B. Cupping C. Hardness D. Tensile |
| Fire refining process is employed in case of___________________? |
| A. Tin B. Copper C. Zinc D. Aluminium |
| In chemical dehumidification of air___________________? |
| A. Both specific humidity & dry bulb temperature increases B. Both specific humidity & dry bulb temperature decreases C. Specific humidity decreases & dry bulb temperature increases D. Specific humidity increases & dry bulb temperature decreases |
| Gage pressure within a spherical droplet of a fluid is ‘p’. What will be gage pressure within a bubble of the same size & of the same fluid ? |
| A. p B. 2 p C. 0.5 p D. 0.25 p |
| One ton of refrigeration is not equivalent to the heat removal rate of ____________________? |
| A. 200 BTU/minute B. 50 kcal/minute C. 50 kJ/sec D. 3.5 KW |
| Which of the following commonly used condenser tube materials has the lowest thermal conductivity ? |
| A. Admiralty brass B. Stainless steel C. Aluminium brass D. Titanium |
| Change in volume of metals from absolute zero temperature to their melting points is___________________? |
| A. Almost same for all metals B. Different for different metals C. Less for low melting point metals D. Less for high melting point metals |
| Suitability of steel for its use in cable is judged by its strength in__________________? |
| A. Tension B. Compression C. Torsion D. Shear |
| Faraday’s law of electrolysis is related to the____________________? |
| A. Cation speed B. Atomic number of the cation C. Equivalent mass of the electrolyte D. None of these |
| Thermodynamic cycle involved in the working of a thermal power plant is the ______________ cycle ? |
| A. Joule B. Carnot C. Rankine D. Brayton |
| Gantt charts are used for streamlining the__________________? |
| A. Inventory control B. Production schedule C. Sales forecasting D. Quality control |
| The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is___________________? |
| A. Full annealing B. Bright annealing C. Patenting D. None of these |
| A jig is used while __________________ a hole? |
| A. Boring B. Counter boring C. Drilling D. Enlarging |
| The product (s) of roasting of a sulphide ore is (are) ? |
| A. Oxide only B. Sulphate only C. Oxide and sulphate D. Dependent on temperature and partial pressure of oxygen & sulphur dioxide |
| Glycerine is used as a coolant in cooling of some engines instead of water, because___________________? |
| A. Its higher boiling point (290°C) increases its heat carrying capacity B. Comparatively less weight of coolant is required C. Smaller radiator can be used D. All a, b & c |
| Alloy powder manufactured by the following process have spherical shapes ? |
| A. Electrochemical deposition B. Gaseous reduction C. Atomisation D. Mechanical attrition |
| Moist air is cooled along the line of constant ________________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs ? |
| A. Enthalpy B. Relative humidity C. Wet bulb temperature D. Dew point temperature |
| Rankine cycle comprises of two isothermal and two ___________________ processes? |
| A. Isobaric B. Polytropic C. Isentropic D. None of these |
| According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to _______________ times the yield stress ? |
| A. 0.5 B. 2 C. √2 D. √3/2 |
| Enzymes belong to the category of_____________________? |
| A. Proteins B. Carbohydrates C. Vitamins D. Fats |
| Dielectric___________________? |
| A. Is an electrical insulating material B. Of low resistivity is preferred C. Should have high thermal conductivity D. Need not defy the corrosive action of chemicals |
| Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog ? |
| A. Nitrogen oxides B. Hydrocarbons C. Both A. & B. D. Carbon monoxide |
| Dry saturated steam can be converted into super heated steam by____________________? |
| A. Increasing its cross-sectional area of flow B. Passing it through a pressure reducing valve C. Forcing it downwards through a vertical tube D. None of these |
| Ultimate strength in tension as compared to that in shear for steel is____________________? |
| A. Half B. One third C. One and half times D. One fourth |
| Fatigue resistance of a material is measured by the _____________________? |
| A. Elastic limit B. Ultimate tensile strength C. Young’s modulus D. Endurance limit |
| The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ? |
| A. 2-5 B. 18-20 C. 12-15 D. 6-12 |
| Hot working of lead is carried out at ___________________? |
| A. 75°C B. 373°K C. 150°C D. Room temperature |
| The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the________________? |
| A. Fatigue strength B. Creep strength C. Resilience D. Endurance limit |
| In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is ? |
| A. Less B. More C. Equal D. Unpredictable |
| Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at________________? |
| A. High vacuum B. Zero pressure C. 0°K D. Earth’s centre |
| Which of the following is the largest quantum of pressure ? |
| A. 1 kg/cm2 B. 1 bar C. 1 atmosphere D. 1 kilo Pascal |
| Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an ______________ body? |
| A. Grey B. Black C. Opaque D. White |
| Super conduction in metals is observed at a temperature of ________________ °K? |
| A. <100 B. >100 C. About 273 D. About 373 |
| The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the ‘Curie temperature’. Its value for cobalt is ______________ °C? |
| A. 768 B. 1127 C. 1359 D. 1480 |
| The product out from a cupola is called ____________________? |
| A. Wrought iron B. Pig iron C. Cast iron D. None of these |
| In the blast furnace, incorporation of water vapour in the blast gives the following effect ? |
| A. Increases the reducing potential of the gas B. Increases the flame temperature C. No significant change occurs D. Increases the hydrogen content in the metal |
| With increase in impurities in metals, their corrosion resistances____________________? |
| A. Increase B. Decrease C. Remain same D. May increase or decrease; depending on the type of metal |
| ______________________ iron is produced by the annealing of white cast iron? |
| A. Malleable B. Nodular C. Ductile D. Grey |
| While the bin cards are used in the effective stores management, the queuing theory is associated with the _______________ time ? |
| A. Waiting B. Idle C. Inspection D. Tool replacement |
| Baffles provided on the shell side of a shell and tube heat exchanger are meant for _____________________? |
| A. Providing support for the tubes B. Improving heat transfer C. Both A & B D. Preventing the fouling of tubes & stagnation of shell side fluid |
| Which of the following alloying elements is present in maximum percentage in high speed steel ? |
| A. Molybdenum B. Chromium C. Tungsten D. Vanadium |
| The main constituent of bones is ______________________? |
| A. CaF2 B. Ca3(PO4)2 C. CaCO3 D. CaCl2 |
| When an isolated thermodynamic system executes a process ___________________? |
| A. Work is done B. Heat transfer takes place C. Mass flow occurs across the boundary of the system D. No chemical reaction takes place within the system |
| A material is capable of resisting softening at high temperature, because of its property termed as____________________? |
| A. Hot temper B. Hot hardness C. Fatigue D. Creep |
| Which of the following heat treatment processes is usually applied to castings ? |
| A. Tempering B. Annealing C. Normalising D. Carburising |
| Atomic _________________ of an element is a whole number ? |
| A. Weight B. Number C. Volume D. Radius |
| Strain hardening effect in metals subjected to cold working is due to the _______________ mechanism? |
| A. Slip B. Fracture C. Winning D. Dislocation |
| Hardening of steel is not possible, unless it is heated _________________ critical point ? |
| A. Above the highest B. Above the lowest C. Between the first & second D. Between the second & third |
| 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__________________? |
| A. 30,000 J B. 60,000 J C. 90,000 J D. 2,40,000 J |
| 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 D. All A, B & C |
| Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete oxidation of un-burnt hydrocarbons is___________________? |
| A. Nickel B. Cobalt C. Vanadium D. Platinum |
| Pick out the wrong unit conversion ? |
| A. 1 Joule = 4.186 calorie B. 1 kcal = 3.968 BTU = 0.00116 kWh = 0.00156 hp C. 1 ton of TNT (tri-nitro-toluene) = 4.2 GJ (1G = 109) D. 1 ft.lbf= 0.3238 calorie = 0.1383 kg.m = 1.356 J = 1.356 N.m |
| Pick out the wrong unit conversion ? |
| A. 1 atm. = 760 mm Hg = 29.92 inch Hg = 14.7 psi = 1.013 bar = 1.013 kgf/cm2 B. 1 kPa = 100 bar C. 1 mm Hg = 1 torr = 133.3 Pa D. None of these |
| “The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements.” This is the statement of___________________? |
| A. Law of Petit and Dulong B. Kopp’s rule C. Nernst heat theorem D. Trouton’s rule |
| Pick out the correct statement ? |
| A. A substance existing above its critical temperature is called a saturated vapor B. A mixture of vapor gas is called saturated, if the equilibrium vapor pressure of the liquid is more than the partial pressure of the vapor at the same temperature C. Heat added to or given up by a substance at constant temperature is called the sensible heat D. The endpoints of a vapor pressure vs. temperature curve are critical and triple points |
| Pick out the wrong statement? |
| A. Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom B. The heat capacity of a solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state C. There is an increase in entropy when a spontaneous change occurs in an isolated system D. At absolute zero temperature, the heat capacity for many pure crystalline substances is zero |
