0% 4 Mechanical Engineering Quiz 13 1 / 50 Air fuel ratio at which a petrol engine can not work is_________________? 10:01 15:01 20 : 1 and less 8:01 2 / 50 Nickel in steel___________________? refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper?ties improves wear resistance, cutting ability and toughness gives ductility, toughness, tensile strength and anticorrosion properties improves cutting ability and reduces hardenability 3 / 50 The knocking in diesel engines for given fuel, will be__________________? unaflected by compression ratio first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed enhanced by decreasing compression ratio enhanced by increasing compression ratio 4 / 50 Stirling and Ericsson cycles are__________________? irreversible cycles quasi-static cycles reversible cycles semi-reversible cycles 5 / 50 German silver is an alloy of___________________? refined silver nickel, copper and zinc silver and some impurities nickel and copper 6 / 50 In locomotive boiler, maximum steam pressure is limited to_______________? 5 kg/cm2 10 kg/cm2 1 kg/cm2 18 kg/cm2 7 / 50 In ideal machines__________________? mechanical advantage is unity mechanical advantage is greater than velocity ratio mechanical advantage is less than velocity ratio mechanical advantage is equal to velocity ratio 8 / 50 A non-yielding support implies that the_________________? support is frictionless support can take any amount of reaction slope of the beam at the support is zero support holds member firmly 9 / 50 According to first law of thermodynamics__________________? work done by a system is equal to heat transferred by the system total energy of a system remains constant total internal energy of a system during a process remains constant internal energy, enthalpy and entropy during a process remain constant 10 / 50 A kinematic chain requires at least________________________? 4 links and 4 turning pairs 5 links and 4 turning pairs 2 links and 3 turning pairs 3 links and 4 turning pairs 11 / 50 Materials after cold working are subjected to following process to relieve stresses__________________? hot working tempering normalising annealing 12 / 50 In a diesel engine, injection pressure developed by injector is of the order of______________? 1400 kg/cm2 10 kg/cm2 500 kg/cm2 100 kg/cm2 13 / 50 Recrystallization temperature is one________________? at which crystals grow bigger in size at which crystals first start forming from molten metal when it is cooled at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated at which change of allotropic form takes place 14 / 50 The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of__________________? forces independence of forces resolution of forces dependence of forces 15 / 50 Which of the following instruments is used to measure flow on the application of Bernoulli?s theorem_________________? nozzle Orifice plate Venturimeter all of the above 16 / 50 Effect of a force on a body depends upon ________________? all of the above magnitude position or line of action direction 17 / 50 In an isothermal atmosphere, the pressure___________________? decreases linearly with elevation varies in the same way as the density remains constant increases exponentially with elevation 18 / 50 If the surface of liquid is convex, men ___________________? cohesion pressure is decreased there is no cohesion pressure cohesion pressure is increased cohesion pressure is negligible 19 / 50 A backing ring is used inside the pipe joint when making a___________________? fillet weld butt weld socket weld sleeve weld 20 / 50 Water is injected in gas turbine cycle to___________________? increase efficiency control output of turbine control temperature control fire hazards 21 / 50 The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is___________________? could be more or less depending on other factors same less more 22 / 50 In S.H.M., acceleration is proportional to _________________? velocity rate of change of velocity all of the above displacement 23 / 50 If some links are connected such that motion between them can take place in more than one direction, it is called_______________? incompletely constrained motion successfully constrained motion completely constrained motion partially constrained motion 24 / 50 The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________? 770?C 1050?C 910?C below recrystallisation temperature 25 / 50 1 m of air at atmospheric condition weighs approximately__________________? 0.5 kg 2.2 kg 1.0 kg 1.3 kg 26 / 50 Pig iron is the name given to________________? iron containing huge quantities of carbon raw material for blast furnace product of blast furnace made by reduction of iron ore iron in molten form in the ladles 27 / 50 Silver-based solder is used for__________________? flaring soft soldering brazing fusion welding 28 / 50 The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is________________? half double same four times 29 / 50 Aluminium bronze contains aluminium and copper in the ratio of___________________? 0.479166667 50:50:00 60:40:00 40 : 60 30 / 50 Which is not correct statement about the function of furnace____________________? separate ash from coal to provide proper conditions for con-tinuous complete combustion maintain heat supply to prepare and ignite the incoming fuel mix fuel with air and ignite 31 / 50 Cavitation is caused by_____________________? weak material high velocity high pressure low pressure 32 / 50 Volumetric efficiency is_____________________? index of compressor performance the ratio of the air actually delivered to the amount of piston displacement reciprocal of compression ratio the ratio of stroke volume to clearance volume 33 / 50 According to Stefan?s law, the total radiation from a black body per second per unit area is proportional to____________________? T2 T5 absolute temperature t 34 / 50 A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is_________________? 7 6 1 5 35 / 50 Bronze contains_____________________? 85-92% copper and rest tin with little lead and nickel 90% copper and 10% tin 70-75% copper and rest tin 70% copper and 30% zinc 36 / 50 A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227? C and 27? His claim is__________________? not possible justified cost will be very high may be possible with lot of sophistications 37 / 50 Which of the following cycles has maximum efficiency_____________? Stirling Brayton Carnot Rankine 38 / 50 A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ? 0.5 0.5 0.4 0.515 39 / 50 Coke is produced by__________________? heating wood in a limited supply of air at temperatures below 300GC binding the pulverised coal into brick-etts pulverising coal in inert atmosphere strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel 40 / 50 Which of the following is secondary fuel ? Th232andU238 U233andPu239 U233andPu238 non oh these 41 / 50 Spontaneous combustion is a phenomenon in which____________________? coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal all the fuel burns instantaneously producing high energy release explosion in furnace fuel burns with less air 42 / 50 The higher temperature in vapour compression cycle occurs at____________________? expansion valve evaporator receiver compressor discharge 43 / 50 Temperature of a gas is produced due to________________? its heating value repulsion of molecules kinetic energy of molecules attraction of molecules 44 / 50 Taper usually provided on cotter is_________________? 1 in 24 1 in 40 1 in 5 1 in 10 45 / 50 The unit of work or energy in S.I. units is_______________? joule pascal kilogram meter newton 46 / 50 If a heat pump cycle operates between the condenser temperature of +27?C and evaporator temperature of ? 23?C, then the Carnot COP will be_________________? 1.2 6 5 0.2 47 / 50 In A-B-C control policy, maximum attention is given to__________________? those items which consume more money those items which consume money those x items which are in more demand those items which are not readily available 48 / 50 Pick up the wrong statement about critical condition of steam___________________? liquid directly becomes steam specific volume of steam and liquid is same this is the maximum pressure limit latent heat is zero 49 / 50 Rotameter is a device used to measure______________? flow absolute pressure velocity of fluid rotation 50 / 50 Angle of descent of cam is defined as the angle__________________? during which the follower returns to its initial position of rotation of the cam for a definite displacement of the follower moved by the cam from the instant the follower begins to rise, till it reaches its highest position through which the cam rotates during the period in which the follower remains in the highest position Provide Your Information Your score is The average score is 75% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMechanical Engineering Quiz 12 Mechanical Engineering Quiz 14Next
