0% 3 Mechanical Engineering Quiz 11 1 / 50 At which pressure the properties of water and steam become identical_________________? 100 kg/cm2 1 kg/cm2 0.1 kg/cm2 225.6 kg/cm2 2 / 50 The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is__________________? high initial cost high heat rejection in condenser higher cost of nuclear fuel lower temperature and pressure condi-tions 3 / 50 Hard coke is used in________________? thermal power plant cement industry domestic use blast furnace 4 / 50 Entropy change depends on___________________? heat transfer change of temperature mass transfer thermodynamic state 5 / 50 Crankcase explosion in I.C engines usuall occurs as ___________________? first a big explosion followed by a mil explosion both mild and big explosions occi simultaneously never occurs first a mild explosion followed by a bi explosion 6 / 50 Which is false statement about normalizing. Normalizing is done to _________________? induce stresses- refine grain structure improve mechanical properties reduce segregation in casting 7 / 50 A fusible plug is fitted in small boilers in order to ___________________? control steam dome avoid explosion avoid excessive build up of pressure extinguish fire if water level in the boiler falls below alarming limit 8 / 50 The pitch of threads on a Jock nut in comparison to pitch of nut is_________________? very coarse finer same coarser 9 / 50 Theoretically, the following engine should have maximum efficiency________________? 4-stroke S.I. engine 2-stroke S.I. engine 4-stroke C.I. engine gas engine 10 / 50 Thermal conductivity of solid metals with rise in temperature normally___________________? remains constant increases decreases may increase or decrease depending on temperature 11 / 50 Ferromagnetic alpha iron exists in temperature range of________________? 1400-1539?C 770 ? 910?C below 723?C 910-1440?C 12 / 50 The state of vapour under saturation condition is described by_______________? pressure and dryness fraction pressure alone pressure and temperature temperature alone 13 / 50 In regenerative air preheater, the heat is transferred _____________________? from a metal wall from one medium to another by direct mixing from heating an intermediateanaterial and then heating the air from this material heat is transferred by bleeding some gas from furnace 14 / 50 A fast breeder reactor uses_______________? U-235 U-238 90% U-235 Pu-239 15 / 50 Primary air is the air used to__________________? convert CO (formed in lower zone of furnace) into C02 at higher zone provide air around burners for obtaining optimum combustion transport and dry the coal air-delivered by forced draft fan 16 / 50 Actual compression curve is___________________? same as isothermal in between isothermal and adiabatic same as adiabatic better than isothermal and adiabatic 17 / 50 One ton of the refrigeration is_________________? the standard unit used in refrigeration problems the cooling effect produced by melting 1 ton of ice the refrigeration effect to produce 1 ton of ice at NTP conditions the refrigeration effect to freeze 1 ton of water at 0?C into ice at 0?C in 24 hours 18 / 50 Buttress threads are usually found on____________________? railway carriage couplings screw cutting lathes feed mechanisms spindles of bench vices 19 / 50 The volumetric efficiency of a compressor falls roughly as follows for every 5?C increase in atmospheric temperature__________________? 0.50% 5% 1% 0.10% 20 / 50 Which of the following is steam dbal? non-coking bituminous coal pulverised coal coking bituminous coal brown coal 21 / 50 Scheduling gives information about____________________? that how idle time can be minimized proper utilisation of machines when work should start and how much work should be completed during a certain period when work should complete 22 / 50 Producer gas is produced by_____________________? passing steam over incandescent coke carbonisation of coal partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast passing air and a large amount of steam over waste coal at about 65?C 23 / 50 The two important forces for a floating body are__________________? buoyancy, gravity buoyancy, pressure buoyancy, inertial inertial, gravity 24 / 50 Queuing theory is associated with __________________? inspection time production time waiting time sales 25 / 50 The unique property of cast iron is its high ___________________? ductility surface finish damping characteristics malleability 26 / 50 Which of the following is an irreversible cycle_____________________? Stirling carnot none of the above ericsson 27 / 50 Shear stress theory is applicable for____________________? brittle materials ductile fnaterials all of the above elastic materials 28 / 50 The volumetirc efficiency of a compressor is calculated on the basis of __________________? volume at 20?C and 1 kg/cm2 volume of air inhaled at N.T.P. conditions volume at 0?C and 1 kg/cm2 volume of air inhaled at working conditions 29 / 50 What does symbol ?V? employ in work study________________? operation inspection delay/ temporary Storage permanent storage 30 / 50 Pick up the incorrect statement? lithium bromide used in vapour absorption cycle is nonvolatile concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator lithium bromide plant can?t operate below 0?C a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing 31 / 50 Half life of a radioactive isotope corresponds to the time required for half of the following to decay__________________? protons atom neutrons electrons 32 / 50 Which is false statement about air receivers ___________________? These act as reservoir to- take care of sudden demands These knock out some oil and moisture These are used to dampen pulsations , These increase compressor efficiency 33 / 50 Dynamic friction as compared to static friction is___________________? less may be less of more depending on nature of surfaces and velocity more same 34 / 50 The hardness of steel increases if it contains____________________? martensite austenite pearlite cementite 35 / 50 Pressure intensifier increases the pressure in proportion to____________________? square of inverse ratio of diameters square of ratio of diameters inverse ratio of diameters ratio of diameters 36 / 50 Alkaline pyrogallate is used in Orsat?s apparatus for absorption of _________________? CO N2 2 C02 37 / 50 In a naturally aspirated diesel engine, the air is supplied by________________? a vacuum chamber a centrifugal blower a supercharger an injection tube 38 / 50 Rating of a domestic refrigerator is of the order of__________________? 0.1 ton 5 tons 10 tons 40 tons 39 / 50 A material capable of absorbing large amount of energy before fracture is known as________________? shock proof resilience toughness ductility 40 / 50 The number of isotopes of hydrogen are _________________? 3 U 1 2 41 / 50 Solid- fuel for nuclear reactions may be fabricated into various small shapes such as___________________? pins plates any one of the above pallets 42 / 50 Angular acceleration of a link can be determined by dividing the___________________? resultant acceleration with length of link centripetal component of acceleration with length of link tangential component of acceleration with length of link all of the above 43 / 50 The hardness of steel primarily depends on _____________________? heat treatment employed %age of carbon %age of alloying elements shape of carbides and their distribution in iron 44 / 50 the chain is constrained when_________________? there is no such criterion for checking above requirement L.H.S. R.H.S. None L.H.S. = R.H.S. 45 / 50 Steam engine operates on_________________? brayton cycle carnot cycle Stirling cycle joule cycle 46 / 50 The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of __________________? repose friction kinematic friction limiting friction 47 / 50 On volume basis, air contains following parts of oxygen _____________________? 23 25 21 77 48 / 50 The linear programming techniques can be applied successfully to industries like_________________? food processing all of the above oil and chemical iron and steel 49 / 50 Cap screws are___________________? provided with detachable caps slotted for a screw driver and generally used with a nut similar to?small size tap bolts except that a greater variety of shapes of heads are available used to prevent relative motion be-tween parts 50 / 50 If two springs are in parallel then their overall stiffness will be_______________? half unpredictable double same Provide Your Information Your score is The average score is 85% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMechanical Engineering Quiz 10 Mechanical Engineering Quiz 12Next
