0% 2 Mechanical Engineering Quiz 26 1 / 50 High carbon content in diesel oil used for diesel engine leads to_________________? excessive engine wear deposition on engine parts production of highly corrosive gases corroding the cylinder walls and exhaust system damaging of both the storage tank and the engine 2 / 50 Resilience of a material is considered when it is subjected to_________________? shock loading fatigue creep frequent heat treatment 3 / 50 A bench vice has following type of threads____________________? acme buttress square metric 4 / 50 Carbon residue in diesel oil should not be more than___________________? 0.50% 0.10% 0.00% 1% 5 / 50 Impulse turbine is generally fitted______________________? about 2.5 m above the tail race to avoid cavitation at the level of tail race little above the tail race slightly below the tail race 6 / 50 The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is_______________? half four times double same 7 / 50 In order to have constant clain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be________________? less than 1.0 equal to 1.0 greater than 1.0 equal to zero 8 / 50 Size of boiler tubes is specified by___________________? outside diameter and thickness inside diameter and thickness outside diameter and inside diameter mean diameter and thickness 9 / 50 A cold chisel is made of_______________? mild steel cast iron high carbon H.S.S. 10 / 50 The three ?Ts? for good combustion are____________________? thorough mixing, total air, and temperature temperature, time, and turbulance total air, time, and temperature total air, true fuel, and turbulance 11 / 50 Heat transfer by radiation mainly depends upon___________________? its temperature all of the above kind and extent of its surface nature of the body 12 / 50 The value of mass density in kgsecVm4 for water at 0?C is_________________? 101.9 1000 1 100 13 / 50 Carnot cycle efficiency is maximum when______________? final temperature is 0?C final temperature is 0?K initial temperature is 0?K difference between initial and final temperature is 0?K 14 / 50 The ratio of lateral strain to the linear strain within elastic limit is known as_______________? modulus of rigidity Young?s modulus bulk modulus Poisson?s ratio 15 / 50 A universal joint is an example of_____________________? higher pair sliding pair lower pair rolling pair 16 / 50 Compressed air coming out from a punctured football___________________? becomes cooler1 remains at the same temperature becomes hotter may become hotter or cooler depend-ing upon the humidity of the surround?ing air 17 / 50 Center of percussion is___________________? the point of metacentre point of suspension the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis the point of C.G. 18 / 50 Pick up the false statement ? overall efficiency of gas turbine plant is lower than that of a reciprocating engine gas turbine does not require huge quantity of water like steam plant exhaust losses in gas turbine are high due to large mass flow rate gas turbine is a self-starting unit 19 / 50 The change in internal energy in steam engines equals to__________________? work done during adiabatic expansion work done during compression. change in enthalpy work done during the rankine cycle ; 20 / 50 The size of inlet valve of.an engine in comparison to exhaust valve is_________________? less same more/less depending on capacity of engine more 21 / 50 The efficiency of I.C engines normally is of the order of_________________? 15-20% 25-30% 30-35% 20-25% 22 / 50 For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal____________________? ratio of inertial force to force due to gravitation ratio of inertial force to force due to surface tension ratio of inertial force to force due to viscosity all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity 23 / 50 If D1 and D2 be the diameters of driver and driven pulleys, then belt speed is proportional to__________________? D2/D1 D1 D1/D2 D1-D2. 24 / 50 ABC analysis deals with_________________? ordering schedule of job flow of material analysis of process chart controlling inventory costs money 25 / 50 A refrigeration cycle operates between condenser temperature of + 27?C and evaporator temperature of- 23?. The Cannot coefficient of performance of cycle will be_________________? 0.2 1.2 6 5 26 / 50 Instantaneous center of rotation of a link in a four bar mechanism lies on _______________? can?t occur a point obtained by intersection on extending adjoining links right side pivot of this link lift side pivot of this link 27 / 50 On weight basis, air contains following parts of oxygen_________________? 23 73 21 25 28 / 50 For the same lift and same angle of ascent, a smaller base circle will give_______________? a small value of pressure angle something else there is no such relation with pressure angle a large value of pressure angle 29 / 50 Atomic number of an element in the periodic table represents the numbers of_________________? electrons in me nucleus neutrons in the nucleus protons in the nucleus electrons in the atom 30 / 50 Critical temperature is? the temperature above which _____________________? water will never evaporate water will evaporate a gas will never liquefy a gas will immediately liquefy 31 / 50 Thermal diffusivity of a substance is __________________? directly proportional to thermal con?ductivity inversely proportional to density of substance inversely proportional to specific heat all of the above 32 / 50 The fatigue life of a part can be improved by_____________________? shot peening electroplating coating polishing 33 / 50 The value of the wavelength for maximum emissive power is given by ___________________? Planck?s law Fourier?s law Wien?s law Stefan?s law 34 / 50 What does symbol ?D? imply in work study ___________________? permanent storage inspection delay/temporary storage transport 35 / 50 The unit of power in S.I. units is_______________________? watt newton pascal erg 36 / 50 For a floating body to be in equilibrium_____________________? centre of buoyancy and e.g. must lie on same vertical plane meta centre should be above e.g. a righting couple should be formed all of the above 37 / 50 The condition of perfect vacuum, i.e., absolute zero pressure can be attained at ____________________? a temperature of ? 273.16?C a negative pressure and 0?C temperature a temperature of 273 ?K a temperature of 0?C 38 / 50 Slack represents the difference between the___________________? proposed allowable time and the earliest expected time latest allowable time and the earliest expected time latest allowable time and the normal expected time normal allowable time and the latest expected time 39 / 50 Pick up the correct statement ? gas .turbine?s blade will appear as impulse section at the hub and as a reaction section at tip gas turbines use both air and liquid cooling gas turbines have their blades similar to steam turbine large gas turbines use radial inflow turbines 40 / 50 Pick up the wrong statement? In 4-stroke engine, a power stroke is obtained in 4-strokes thermal efficiency of 4-stroke engine is more due to positive scavenging 2-stroke engine can run in any direction petrol engines occupy more space than diesel engines for same power output 41 / 50 A self locking screw has________________> coefficient of friction > tangent of load angle coarse threads hole for inserting split pin fine threads 42 / 50 The fuel in diesel engine is normally injected at pressure of_________________? 20-25 kg/cm2 90-130 kg/cm2 60-80 kg/cm2 5-10 kg/cm2 43 / 50 Two pipe systems can be said to be equivalent, when the following quantities are same__________________? friction factor and diameter length and diameter friction loss and flow flow and length 44 / 50 Reflector in nuclear plants is used to________________? shield the radioactivity completely return the neutrons back into the core check polllution conserve energy 45 / 50 Which of the following processes is irreversible process___________________? adiabatic throttling isothermal all of the above 46 / 50 Total heat of a substance is also known as __________________? internal energy enthalpy thermal capacity entropy 47 / 50 The total energy released in fission of U is__________________? 199 MeV 5 MeV 10 MeV 168 MeV 48 / 50 The Bifilar suspension method is used to determine__________________? position of balancing weights moment of inertia centripetal acceleration? natural frequency of vibration 49 / 50 In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called_____________? yielding plasticity creeping breaking 50 / 50 The sense of Corioli?s component is such that it_________________? leads the sliding velocity vector by 90? is along the sliding velocity vector leads the sliding velocity vector by 180? lags the sliding velocity vector by 90? 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