| Boiling point of water gets lowered at high altitudes (e.g., hills), because ___________________? |
| A. Temperature is low B. Atmospheric pressure is low C. Atmospheric pressure is high D. None of these |
| The leaching solvent used in Baeyer’s process for the purification of bauxite is___________________? |
| A. Ammonium hydroxide B. Sodium carbonate C. Sodium hydroxide D. Ammonium carbonate |
| With increase in annealing temperature, the following defect density decreases? |
| A. Vacancy B. Dislocation C. Grain boundary D. All of these |
| A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its_______________? |
| A. Aqueous tension B. Saturated humidity C. Vapor pressure D. Absolute humidity |
| Addition of _______________ to steel does not help in improving its machinability ? |
| A. Sulphur B. Silicon C. Lead D. Phosphorous |
| 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 ? |
| A. 5 B. 10 C. 20 D. 35 |
| 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 |
| _______________ test can be termed as the semi-destructive test? |
| A. Impact B. Torsion C. Hardness D. Charpy |
| Dowtherm is a____________________? |
| A. High temperature heating medium (a petroleum product) B. Product of coal tar distillation C. Very heat sensitive material D. None of these |
| Boiler tube size is specified by its thickness and _____________________ diameter ? |
| A. Outside B. Inside C. Mean D. None of these |
| The rolling process cannot be used to produce______________________? |
| A. Plates B. Rods C. Tubes D. Wires |
| In “Imperial Smelting Process” for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _______________________? |
| A. Jet of water at high pressure B. Blast of air C. Mixture of water and air D. Rain of molten lead |
| The most suitable material of construction for a sewer to carry sewage under high pressure is________________________? |
| A. Asbestos cement B. Steel C. Cement concrete D. Stoneware |
| Which of the following is not a dielectric material ? |
| A. Cotton, silk and paper B. Asbestos, glass, porcelain and mica C. Rubber and polymeric resins D. All refractory materials |
| 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 C. Produce fluorescence D. Heat the exposed material |
| Which of the following is prone to cup and cone fracture ? |
| A. Cast iron B. Soft brass C. Round specimen of ductile metal D. Flat tensile specimen of ductile metal |
| Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank) ? |
| A. H B. H/2 C. H/4 D. H/6 |
| Austempering process results in the formation of ________________ structure ? |
| A. Martensitic B. Bainitic C. Carburised D. Stressed |
| Good design of the casing of a centrifugal pump aims at minimising the __________________________? |
| A. Cavitation B. Frictional losses C. Kinetic energy loss D. Static head |
| 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 ? |
| A. 159 B. 1837 C. 2537 D. 10000 |
| Matte smelting is used in the extraction of_____________________? |
| A. Lead B. Zinc C. Aluminium D. Copper |
| Carnot cycle is also termed as the constant _________________ cycle in thermodynamics? |
| A. Entropy B. Pressure C. Volume D. Heat |
| Large diameter reinforced cement concrete (RCC) pipes are generally joined by ____________________ joint ? |
| A. Flanged iron B. Collar C. Flexible D. Expansion |
| A dummy activity is used in PERT network to describe the_____________________? |
| A. Precedence relationship B. Resource idleness C. Resource restriction D. Necessary time delay |
| Unit of viscosity in CGS system is_______________________? |
| A. gm .cm-1 sec-1 B. gm . cm2 . sec-2 C. gm .cm-2, sec-1 D. gm . cm . sec-1 |
| The refractory lining of the bottom in a basic electric arc furnace is made of___________________? |
| A. Silica B. Alumina C. Magnesia D. Fireclay |
| The specific gravity of coal depends mainly on its __________________ content ? |
| A. Carbon B. Volatile matter C. Ash D. Moisture |
| In practice, the compression ratio of compression-ignition (CI) engine ranges from ______________________? |
| A. 15 to 25 B. 5 to 10 C. 40 to 55 D. 60 to 70 |
| Brittleness induced due to the presence of sulphur in steel can be reduced by adding____________________? |
| A. Manganese B. Magnesium C. Vanadium D. Copper |
| With increase in temperature, the surface tension of water_______________________? |
| A. Increases B. Decreases C. Remain constant D. Increases linearly |
| Spherical shape of mercury droplets is due to its____________________? |
| A. High viscosity B. Low surface tension C. High density D. High surface tension |
| Carbon is present in the form of _______________________ in grey cast iron ? |
| A. Spheroids B. Nodular aggregates of graphite C. Flakes D. Cementite |
| The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong _____________________? |
| A. Base and strong acid B. Base and weak acid C. Acid and weak base D. None of these |
| ‘Cryogenics’ is concerned with the generation & use of low temperature in the range of____________________? |
| A. 0°K to 123°K B. 0°C to – 123°C C. 0°C to – 273°C D. 0°K to 273°K |
| __________________ of air does not increase with increase in temperature? |
| A. Density B. Thermal diffusivity C. Viscosity D. Thermal conductivity |
| The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be_____________________? |
| A. 0.8 B. 1 C. 1.4 D. 1.8 |
| Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner ? |
| A. Output & fineness B. Velocity C. Both A. & B. D. None of these |
| ______________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently ? |
| A. Collar B. Flanged C. Bell and Spigot D. Expansion |
| The pressure outside a bubble/droplet of liquid is ________________ the internal pressure? |
| A. Greater than B. Less than C. Equal to D. Unpredictable; depends on the bubble size |
| Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is_____________________? |
| A. 5CaO. 3 Al2O3 B. 3CaO. Al2O3 C. 3CaO. SiO2 D. 2CaO. SiO2 |
| Oxygen cylinders used for autogenous (cutting/welding) purposes are ___________________? |
| A. Seamless & made of steel B. Heat treated before use C. Made by sand casting D. Welded steel cylinders |
| Heating of ferromagnetic materials to a temperature above Curie temperature makes it ________________________? |
| A. Insulator for heat & electricity transmission B. Ferritic C. Behave like paramagnetic materials D. Superconductor |
| Which of the, following is not associated with the functioning of a petrol engine ? |
| A. Compression ignition system B. Spark plug C. Carburettor D. Otto cycle |
| Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ? |
| A. Cobalt, chromium & tungsten B. Cobalt, chromium & nickel C. Molybdenum, tungsten & chromium D. Cobalt, zirconium & molybdenum |
| Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost________________? |
| A. Only B. Plus variable cost C. Plus overhead cost D. Plus selling expenses |
| Property responsible for the talcum powder to cling to the skin is the__________________? |
| A. Capillary action B. Adhesion C. Cohesion D. Surface tension |
| During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to____________________? |
| A. Time B. Square root of time C. Square of time D. Cube of time |
| Percentage of differential pressure lost in a Venturimeter with a tapering of 15° may be about___________________? |
| A. 1 B. 10 C. 25 D. 50 |
| ____________________ flux is used for the extraction of metal from its self fluxing ores? |
| A. No B. Acid C. Basic D. Neutral |
| Uniform ramming of sand in green sand moulding process leads to____________________? |
| A. Reduced chance of gas porosity B. Greater dimensional stability of the casting C. Uniform flow of molten metal into the mould cavity D. Less sand expansion type of casting defect |
| At the point of boundary layer separation in fluid flow, the _____________________? |
| A. Shear stress is maximum B. Velocity gradient is flat C. Density variation is maximum D. Shear stress is zero |
| In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is__________________? |
| A. More B. Less C. Equal D. Much more |
| ________________ property of steel increases by addition of large amount of silicon in it? |
| A. Mechanical B. Machining C. Magnetic D. Refractory |
| When the wavelength of incident X-rays increases, the angle of diffraction__________________? |
| A. Decreases B. Increases C. Remain constant D. Shows no systematic variation |
| Liquid nitrogen containers can be made from ___________________? |
| A. Ferritic stainless steel B. HSLA steel C. Titanium D. Austenitic stainless steel |
| To counteract the bad effects of strain hardening on a cold formed part, it must be ______________________? |
| A. Tempered B. Normalised C. Annealed D. Hardened |
| The thermodynamic law, PVy = constant, is not followed by the __________________? |
| A. Free expansion of an ideal gas B. Adiabatic expansion of steam in turbine C. Adiabatic compression of air D. Ideal compression of air |
| Material of construction of foundry crucible is _________________? |
| A. Lead B. Stainless steel C. Graphite D. Cast iron |
| _______________ test determines the yield strength, Young’s modulus of elasticity, percentage reduction in area & percentage elongation of a material ? |
| A. Tensile B. Fatigue C. Impact D. None of these |
| Bad odour in sanitary latrines is reduced by periodically sprinkling_____________________? |
| A. Bleaching powder B. Lime powder C. Aluminium sulphate D. None of these |
| The minimum and the maximum number of members required to form a Private Limited Joint Stock Company are respectively __________________? |
| A. 7 and 30 B. 10 and 50 C. 2 and 50 D. 13 and 55 |
| Which of the following metals reacts violently with water ? |
| A. Mercury B. Sodium C. Calcium D. Magnesium |
| Steel is welded using the ________________ flame ? |
| A. Carburising B. Neutral C. Oxidising D. All A, B. & C |
| ________________ is a special constituent of chlorophyll without which photosynthesis is not possible ? |
| A. Calcium B. Nitrogen C. Phosphorous D. Hydrogen |
| The highest stress that a material can withstand for a specified length of time without excessive deformation is called the ____________ strength ? |
| A. Creep B. Endurance C. Fatigue D. None of these |
| Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of _______________ gms of zinc per m2 of steel strip ? |
| A. 5-10 B. 1000-1500 C. 120-500 D. 1500-3000 |
| 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__________________? |
| A. 1 : 1 B. 1 : 2 C. 2 : 1 D. 1 : 4 |
| Force between the molecules of the same substance is called ______________________ force? |
| A. Adhesive B. Cohesive C. Molecular D. Vander Walls |
| Quartz is a ________________ material ? |
| A. Diamagnetic B. Ferromagnetic C. Ferroelectric D. Piezoelectric |
| The majority charge carriers in p-type silicon are______________________? |
| A. Free electrons B. Ions C. Conduction electrons D. Holes |
| Which of the following is the most suitable abrasive for grinding high tensile strength materials ? |
| A. Silicon carbide B. Corundum C. Aluminium oxide D. Boron carbide |
| The noble metals________________? |
| A. Are exemplified by Na, K and Li B. Do not resist corrosion very strongly C. Are the lowermost in the electro-chemical series of metals D. None of these |
| Unit of surface tension in S.I. unit is_________________? |
| A. Watt/m B. Joule/m2 C. Newton/m2 D. Joule/m |
| Co-efficient of performance of a Carnot cycle refrigerator operating between – 23°C and + 27°C is ________________? |
| A. 3 B. 5 C. 0.5 D. 1.5 |
| Lead is poured into the joint between two _______________ pipes ? |
| A. Mild steel B. Concrete C. Cast iron D. Asbestos cement |
| ______________ circuit is most commonly used to measure strain with the help of a strain gauge? |
| A. Ballast B. Voltage balancing potentiometric C. Simple current sensitive D. None of these |
| Basic open hearth furnace (BOF) is not used for producing ______________ steel? |
| A. Killed B. Rimming C. High alloy D. None of these |
| Laser is a device to produce___________________? |
| A. Gamma rays B. Microwaves C. A beam of white light D. A beam of coherent light |
| Which of the following is the most wear resistant grade of carbide used for the cutting tools ? |
| A. Aluminium carbide B. Tungsten carbide C. Nickel carbide D. Iron carbide |
| Thermal efficiency of an internal combustion engine is around ______________ percent? |
| A. 8 B. 35 C. 65 D. 80 |
| Hydrogen in liquid steels is dissolved_________________? |
| A. As tiny gas bubbles B. In the atomic form C. In the ionic form D. In the molecular form |
| Nickel and ______________ are the alloying element added in steel to increase its toughness? |
| A. Molybdenum B. Chromium C. Vanadium D. Silicon |
| The lightest non-inflammable gas is_________________? |
| A. H2 B. He C. Ar D. O2 |
| The surface tension of a liquid, at critical temperature is____________________? |
| A. Indeterminate B. Zero C. Infinity D. Same as that at any other temperature |
| ‘Amortization’ in respect of financial obligation of a company means the_____________________? |
| A. Liquidation of financial obligations on instalment basis B. Commitment of financial obligation on priority C. Liquidation of all the obsolete equipments of the company D. Modernisation of the plant equipments |
| The same volume of all gases is representative of their_____________________? |
| A. Specific gravities B. Densities C. Gas characteristic constants D. Molecular weights |
| The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the _____________ of the slag ? |
| A. Fluidity B. Basicity C. Acidity D. Viscosity |
| For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by__________________? |
| A. (ε1 + ε2)/ε1.ε2 B. ε1.ε2/(ε1 + ε2 – ε1.ε2) C. ε1.ε2 D. ε1 + ε2 |
| Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of ________________? |
| A. Paper B. Cloth C. Lead D. Aluminium |
| Which of the following is an unconventional source of energy ? |
| A. Thermal power B. Hydroelectric power C. Nuclear-fusion power D. Solar power |
| 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 ? |
| A. Copper B. Steel C. Aluminium D. Brass |
| 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 D. All ‘A’, ‘B’ & ‘C’ |
| Super heating of steam is done at constant___________________? |
| A. Enthalpy B. Entropy C. Pressure D. Volume |
| Corrosion is____________________? |
| A. A physical phenomenon B. A chemical phenomenon C. Same as erosion D. An uncontrollable phenomenon |
| Which of the following phenomenon will exhibit the minimum heat transfer ? |
| A. Boiling B. Forced convection in air C. Free convection in air D. Conduction in air |
| Which of the following metals cannot be hot worked at room temperature ? |
| A. Zinc B. Nickel C. Lead D. Tin |
| Which of the following equipments is used for liquid dispersion ? |
| A. Packed column B. Venturi scrubber C. Bubble cap plate column D. Wetted wall column |
| Limestone is added in the blast furnace (during pig iron manufacture) to______________________? |
| A. Form slag by combining with impurities B. Supply heat by undergoing exothermic reaction with impurities C. Reduce the coke consumption D. Reduce slag viscosity |
| The boiling & freezing points on a newly defined temperature scale in degree ‘D’ are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to _____________ °D ? |
| A. 140 B. 180 C. 240 D. 280 |
| Difference at any instant between the value of the controlled variable and the set point is called the__________________? |
| A. Deviation B. Derivative time C. Error ratio D. Differential gap |
| Cementite is in the lamellar form in the _____________________ phase of steel ? |
| A. Martenistic B. Bainitic C. Pearlitic D. Ferritic |
| Brazing is the joining of metals_____________________? |
| A. Without melting the base metal B. With a non-ferrous filler C. Both A. & B. D. Neither A. nor (B) |
| Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of_________________? |
| A. Lumps B. Pellets C. Briquettes D. Sinter |
| Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be_____________________? |
| A. 5 B. 1.25 C. 2.5 D. 3.75 |
| Which of the following low melting alloy containing bismuth and lead is used for electric fuse ? |
| A. Wood’s metal B. Babbitt metal C. Monel metal D. Duralumin |
| Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of_____________________? |
| 0 |
| A. 90% tungsten carbide and 10% cobalt B. 70% aluminium oxide & 30% silica C. 30% nickel, 15% chromium & 55% tungsten D. 65% tungsten & 35% zirconium |
| The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the___________________? |
| A. Final control element B. On-off control C. Floating control action D. None of these |
| The substance used as a smoke screen in warfare is___________________? |
| A. C2H2 B. SiCl4 C. P2O5 D. PCl5 |
| Increasing sulphur content in pig iron tends to make it ________________? |
| A. Soft B. Hard C. Tough D. Ductile & malleable |
| Fahrenheit and Centigrade scales have the same readings at _____________________? |
| A. -55° B. -40° C. -33° D. -58° |
| For separating small pieces of metal from engine oil of a car, the best separating technique is the _____________________ ? |
| A. Chromatography B. Evaporation C. Filtration D. Fractional distillation |
| In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet ? |
| A. Zirconia B. Alumina C. Bakelite D. Tungsten carbide |
| In TIG welding, thoriated tungsten electrodes are used, because it ____________________? |
| A. Has higher current carrying capacity B. Has better electron emissivity C. Is stronger than ordinary tungsten D. Is easy to prepare |
| The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased ___________________ times ? |
| A. Two B. Four C. Six D. Eight |
| A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material ? |
| A. Steel B. Glass C. Rubber D. Brass |
| The dimensional formula of bulk modulus of elasticity is same as that of the ____________________? |
| A. Pressure B. Density C. Force D. None of these |
| Working of linear variable differential transducer (LVDT) is based on the principle of variable_____________________? |
| A. Capacitance B. Resistance C. Mutual inductance D. None of these |
| A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson’s ratio of the rod is___________________? |
| A. 0 B. 0.33 C. 0.44 D. 0.25 |
| Which of the following metals is the most prone to work hardening ? |
| A. Brass B. Aluminium C. Copper D. Lead |
| Wavelength of radiation emitted by a body depends on the ________________ of its surface? |
| A. Temperature B. Area C. Nature D. All ‘A’, ‘B’ & ‘C’ |
| A pycnometer is used for the measurement of________________________? |
| A. Flow rate of molten metal B. Specific gravity of a liquid C. Composition of alloys D. Concentration of a solution |
| Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot_____________________? |
| A. Piercing B. Spinning C. Drawing D. Extrusion |
| Metal shots used in shot blasting are made of ______________________? |
| A. Stellite B. Steel C. Bronze D. Lead |
| Inertial forces are obtained, when the elastic forces are multiplied by ______________ number? |
| A. Mach B. Froude C. Reynolds D. Euler |
| Dephosphorization of molten pig iron is favoured by_______________________? |
| A. Oxidising and basic slag B. Reducing and basic slag C. High activity co-efficient of phosphorous in metal D. Oxidising and neutral slag |
| To improve the machinability of steel, it is generally subjected to _____________________? |
| A. Spheroidising B. Tempering C. Normalising D. Annealing |
| For a spontaneous natural process at constant temperature and pressure, the free energy of the system always____________________? |
| A. Increases B. Decreases C. Remain constant D. Increases to a maximum before decreasing |
| Oxyacetylene reducing flame is used while carrying out welding on___________________? |
| A. Alloy steel B. Grey cast iron C. Mild steel D. High carbon steel |
| __________________ stress cannot be sustained by a fluid in equilibrium ? |
| A. Shear B. Tensile C. Compressive D. None of these |
| Out of the following, which will fracture most readity, when hit with a hard hammer ? |
| A. Brass B. Bronze C. German silver D. Cast iron |
| The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element ? |
| A. Silicon B. Carbon C. Phosphorous D. Chromium |
| Ferromagnetic materials owe their properties to __________________ inner sub-shells ? |
| A. Completely filled B. Partially filled C. Equally filled D. Vacant |
| Water-tube boiler is the one, in which _____________________? |
| A. Water passes through tubes and flue gases around it B. Tube carrying hot flue gases are immersed in a pool of water C. Tubes are placed in vertical position D. None of these Answer: Option A |
| The refrigerant freon-12 is chemically_______________________? |
| A. CCl2F2 B. CCl3F C. CClF3 D. CCl4F |
| Eutectoid composition of carbon steel at room temperature is___________________? |
| A. Cementite B. Pearlite C. Martensite D. Ferrite |
| Larger length & diameter water pipes are made by____________________? |
| A. Electrical resistance welding B. Die casting C. Semi-centrifugal casting D. Continuous casting |
| Which of the following is an acidic constituent of B.F. slag ? |
| A. SiO2 B. FeO C. MgO D. CaO |
| Addition of _____________________ to steel does not impart hardness? |
| A. Nickel B. Copper C. Chromium D. Silicon |
| M10 index of coke indicates its____________________? |
| A. Compressive strength B. Hardness C. Abrasion resistance D. Impact strength |