0% 4 Mechanical Engineering Quiz 9 1 / 50 In a rigid link OA, velocity of A w.r.t. will be___________________? along AO perpendicular to OA parallel to OA at 45? to OA 2 / 50 Permalloy is a___________________? nickel and iron alloy having high permeability polymer kind of stainless steel none ferrous alloy 3 / 50 The correct composition of Babbit metal is__________________? 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg 87% Sn, 4% Cu, 8% Sb, 1% Al 4 / 50 Corrundum contains more than 95% _____________________? A1203 steel Si02 MgO 5 / 50 The direction of Corioli?s component of acceleration is the direction _____________________? along tangential acceleration of relative velocity vector for the two coincident points rotated by 90? in the direction of the angular velocity of the rotation of the link along the centripetal acceleration along perpendicular to angular velocity 6 / 50 The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, ? ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be__________________? 10 kg, ? ve sense 10 kg, + ve sense 20 kg, + ve sense 20 kg, ? ve sense 7 / 50 An isolated system is one in which_____________________? mass does not cross boundaries of the system, though energy may do so mass crosses the boundary but not the energy neither mass nor energy crosses the boundaries of the system both energy and mass cross the boundaries of the system 8 / 50 In a typical medium speed 4-stroke cycle diesel engine the inlet valve_____________________? opens at 10? after top dead center and closes 20? before the bottom dead center may open or close anywhere opens at top dead center and closes at bottom dead center opens at 20? before top dead center and closes at 35? after the bottom dead center 9 / 50 The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is________________? lower same higher unity 10 / 50 Effective moderators are those materials which contain____________________? light weight atoms zero weight atoms critical atoms heavy weight atoms 11 / 50 Jam nut is a locking device in which _____________________? through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming a slot is cut partly in middle of nut and then slot reduced by tightening a screw a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip 12 / 50 Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal_________________? electromagnetic axial centrifugal reciprocation 13 / 50 Incomplete combustion can be best judged by__________________? measuring carbon mono-oxide in flue gases measuring temperature of flue gases at exit of furnace excess air in flue gases smoky chimney exit 14 / 50 Which of the following is the example of lever of first order__________________? all of the above pair of clinical tongs pair of scissors arm of man 15 / 50 The region between the separation streamline and the boundary surface of the solid body is known as__________________? lift drag wake boundary layer 16 / 50 PERT/CPM, techniques can be used for following applications____________________? maintenance jobs all of the above once through project research and development 17 / 50 Plastic flow in ductile materials_____________________? has no effect on it increases the seriousness of static load-ing stress concentration depends on other considerations lessens the seriousness of static load?ing stress concentration 18 / 50 High carbon steel carries carbon %age c_________________? 0.1 to 0.3% 0.6 to 0.8% 0.3 to 0.6% 0.8 to 1.5% 19 / 50 The specific speed of turbine is defined as the speed of a unit___________________? of such a size that it requires unit power per unit head of such a size that it delivers unit dis-charge at unit head of such a size that it produces unit horse power with unit head of such a size that it delivers unit dis-charge at unit power 20 / 50 Queuing theory deals with problems of________________? better utilization of man services reducing the waiting time or idle Jajme effective use of machines material handling 21 / 50 Pitch point on a cam is_________________? the point on cam pitch curve having the maximum pressure angle any point on pitch curve any point on pitch circle the point on cam pitch curve having the minimum pressure angle 22 / 50 According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to_________________? weight of the fluid displaced by the body the weight of the body less than the weight of the body more than the weight of the body 23 / 50 Exhaust pipes of engines are covered with insulating marterial in order to_________________? reduce formation of condenstae reduce heat transfer to the engine room increase engine efficiency keep the exhaust pipes warm 24 / 50 Efficiency of a thermal cycle increases by ________________? regeneration All None reheating of steam 25 / 50 Which of the following varieties of coals is mostly used in steam boilers____________________? peat brown coal none of the above non-coking bituminous coal 26 / 50 The self-ignition temperature of diesel oil compared to petrol is_________________? higher depends on quality of fuel lower same 27 / 50 The diameters of fire tubes and superheaer tubes in locomotive boiler are_________________? 47.5 mm, 130 mm 32.5 mm, 180 mm 65.5 mm, 210 mm 24.5 mm, 65 mm 28 / 50 Gamma iron exits at following temperature___________________? room temperature between 1400?C and 1539?C between 910?C and 1400?C near melting point 29 / 50 If no resistance is encountered by displacement, such a substance is known as ___________________? gas fluid water ideal fluid 30 / 50 Barometric pressure is equal to_____________________? 1 mm Hg 735.6 mm Hg zero mm Hg 760 mm Hg 31 / 50 Carbon in iron is an example of__________________? all of the above interstitial solid solution substitutional solution intermetallic compounds 32 / 50 If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to___________________? 0.25 0.2 0.5 0.6 33 / 50 The following element can?t impart high strength at elevated temperature__________________? manganese silicon nickel magnesium 34 / 50 Descripancies of bar chart techniques are________________? all of the above consequential effects of lack in one activity on omer consequential effects of lack in one activity on the finish date free time available for an activity can?t be predicted 35 / 50 Fuel consumption with increase in back pressure will________________? increase decrease depend on other factors remain unaffected 36 / 50 Low specific speed of turbine implies it is__________________? impulse turbine propeller turbine Francis turbine any one of the above 37 / 50 Slow plastic defomiation of metals under a constant stress is known as________________? plastic deformation fatigue creep endurance 38 / 50 Which of the following has highest specific strength of all structural materials__________________? chromium alloys magnetic steel alloys magnesium alloys titanium alloys 39 / 50 Maximum work is done in compressing air when the compression is_________________? adiabatic any one of the above polytropic isothermal 40 / 50 An adiabatic wall is one which__________________? encourages thermal interaction discourages thermal interaction permits thermal interaction prevents thermal interaction 41 / 50 Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one_______________? ellipse circle hyperbola parabola 42 / 50 An engine operates between temperatures of 900?Kandr2 and another engine between T2 and 400?K For both to do equal work, value of T2 will be________________? 625?K 650?K 600?K 700?K 43 / 50 The unit of radio-activity is_____________? curie electron-ampere electron-volt MeV 44 / 50 Center of pressure compared to e.g. is___________________? below it above or below depending on area of body at same point above it 45 / 50 Other method of reducing shock load in the above case can be_________________? unaffected by length to increase length to decrease length other factors would decide same 46 / 50 In precombustion chamber in diesel engine________________? There are no valves The shape and layout of the pistion crown, the inlet port, and the valve produce the turbulent effect of fuel mixture Only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge Fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat 47 / 50 For the same size and weight, a two stroke engine as compared to four stroke engine will generate power_________________? about twice about 0.5 times about 1.7 times nearly equal 48 / 50 Corrosion resistance of steel is increased by adding__________________? nickel and molybdenum aluminium and zinc tungsten and sulfur chromium and nickel 49 / 50 Select the correct statement? Local atmospheric pressure is always below standard atmospheric pressure Local atmospheric pressure depends upon elevation of locality only Standard atmospheric pressure is the mean local atmospheric pressure a* sea level A barometer reads the difference be-tween local and standard atmospheric pressure 50 / 50 The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to_________________? 1000 21,000 2100 2700 Provide Your Information Your score is The average score is 67% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMechanical Engineering Quiz 8 Mechanical Engineering Quiz 10Next
