0% 12 Mechanical Engineering Quiz 2 1 / 50 One time measurement unit (TMU) in method time measurement system equals______________? 0.001 minute 0.006 minute 0.0001 minute 0.0006 minute 2 / 50 When two plates are butt together and riveted with cover plates with two rows of rivets, the joi;it is known as ___________________? single riveted single cover butt joint butt joint double riveted double cover butt joint lap point 3 / 50 The spark plug gap is normally maintained at________________? 0.2 to 0.4 mm 0.45 to 0.6 mm 0.1 to 0.2 mm 0.6 to 0.8 mm 4 / 50 If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix i and o stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity______________? U,<V0 Vi=V0B Vt>V0 V,= U0 5 / 50 The criterion of the thermodynamic efficiency for rotary compressor is_________________? isentropic compression polytropic compression any one of the above isothermal compression 6 / 50 More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________? 14.7 kg/cm2 6 kg/cm2 2 kg/cm2 10 kg/cm2 7 / 50 A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________? slant down towards direction of pull remain horizontal unpredictable slant up towards direction of pull 8 / 50 The probability distribution of project completion in PERT follows following distribution_________________? normal beta binomial Gaussian 9 / 50 In forced circulation type boiler__________________? water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum feed pump is employed to supplement natural circulation in water wall type furnace water is converted into steam in one pass without any recirculation 10 / 50 The center of percussion of the homogeneous rod of length L suspended at the top will be___________________? L/3 3L/4 2L/3 L/2 11 / 50 With increase in load, radiant super heater has____________________? lihear characterisstic drooping characteristic flat characteristic rising characteristic 12 / 50 In testing a material for endurance strength, it is subjected to_______________________? static load completely reversed load impact load dynamic load 13 / 50 Centrifugal pump is started with its delivery valve __________________? kept fully closed kept fully open irrespective of any position kept 50% open 14 / 50 In grey cast iron, carbon is present in the form of____________________? cementite free carbon spheroids flakes 15 / 50 Gas turbine works on______________? Rankine cycle Erricsson cycle Brayton or Atkinson cycle Carnot cycle 16 / 50 Amorphous material is one___________________? which is not attacked by phosphorous in which atoms align themselves in a geometric pattern upon solidification which emits fumes on melting in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid 17 / 50 The following type of nut is used with alien bolt____________________? hexagonal nut alien nut slotted nut any one of the above 18 / 50 White cast iron__________________? is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable is produced by annealing process. It is soft, tough and easily machined metal contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material 19 / 50 Which of the following materials is most elastic_________________? brass rubber steel plastic 20 / 50 Ram compression in turbojet involves____________________? compression of inlet air reduction of speed of incoming air and conversion of part of it into pressure energy increasing speed of incoming air lost work 21 / 50 The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is______________________? 29.27 kgfm/mol?K 427kgfm/mol?K 848kgfm/mol?K 8314kgfm/mol?K 22 / 50 Thermal diffusivity is ____________________? a physical property of the material used as mathematical model a dimensionless parameter function of temperature 23 / 50 Isotropic materials are those which have the same ____________________? stresses induced in all directions electric and magnetic properties in all directions elastic properties in all directions thermal properties in all directions 24 / 50 Which of the following substance will have same percentage in both proximate and ultimate analysis___________________? ash hydrogen volatile matter moisture 25 / 50 Frictional force encountered after commencement of motion is called ___________________? limiting friction dynamic friction kinematic friction post friction 26 / 50 A material is known as allotropic or polymorphic if it __________________? exists in several crystal forms at different temperatures has its atoms distributed in a random pattern responds to heat treatment has a fixed structure under all conditions 27 / 50 The feed check valve is used in order to ______________________? regulate flow of boiler water recirculate unwanted feed water allow high pressure feed water to flow to drum and not allow reverse flow to take place check level of water in boiler drum 28 / 50 The specific heat of superheated steam in kcal/kg is generally of the order of___________________? 0.1 0.3 0.8 0.5 29 / 50 A hmh flame speed is obtained in diesel engine when air fuel ratio is_______________? about 10% rich mixture about 3-5% rich mixture uniform throughout the mixture chemically correct mixture 30 / 50 The buckling load for a given material depends on___________________? Poisson?s ratio and modulus of elasticity slenderness ratio, area of cross-section and modulus of elasticity slenderness ratio and area of cross-section slenderness ratio and modulus of elasticity 31 / 50 In a refrigeration cycle, the flow of refrigerant is controlled by___________________? compressor expansion valve evaporator condenser 32 / 50 An alien bolt is___________________? used in high speed components same as stud provided with hexagonal depression in head self locking bolt 33 / 50 Condensing temperature in a refrigerator is the temperature_________________? of cooling medium of freezing zone of evaporator at which refrigerant gas becomes liquid 34 / 50 The unit?of universal gas constant is___________________? dynes/?C ergscm/?K erg/?K watts/?K 35 / 50 The ratio of elongation in a prismatic bar due to its own weight (W) as compared to another similar bar carrying an additional weight (W) will be _________________? 1:03 1:02 1:04 01:02.5 36 / 50 The unit of overall coefficient of heat transfer is___________________? kacl/m hr ?C kcal/hr ?C kcal/m2 kcal/m2 hr ?C 37 / 50 Work study is done with the help of_______________? material handling process chart all of the above stop watch 38 / 50 Which of the following is false statement in respect of differences between machine and structure___________________? Machines modify movement and work, whereas structures modify forces Efficiency of machines as well as structures is below 100% Machines transmit mechanical work, whereas structures transmit forces In machines, relative motion exists be-tween its members, whereas same does hot exist in case of structures 39 / 50 The elasticity of various materials is controlled by its___________________? stress at elastic limit ultimate tensile stress stress at yield point proof stress 40 / 50 Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits ? 02, N2, H2, air 02, N2, steam, C02 S02, NH3, C02, moisture Oz, N2, water vapour 41 / 50 The rating of a diesel engine, with increase in airintlet temperature, will ___________________? increase parabolically decrease parabolically increase linearly decrease linearly 42 / 50 The maximum strain energy that can be stored in a body is known as________________? resilience impact energy modulus of resilience proof resilience 43 / 50 Three different weights fall from a certain height under vacuum. They will take______________? times inversely proportional to weight to reach earth times proportional to weight to reach earth same time to reach earth unpredictable 44 / 50 The height of chimney in a power plant is governed by__________________? control of pollution the draft to be created limitation of construction facilities quantity of flue gases to be handled 45 / 50 A jet engine works on the principle of conservation of____________________? flow linear momentum energy mass 46 / 50 In an isothermal process, the internal energy of gas molecules________________? may increase/decrease depending on the properties of gas decreases remains constant increases 47 / 50 The thrust on the rotor in a centrifugal compressor is produced by________________? resultant component tangential component axial component radial component 48 / 50 Which of the following disciplines provides study of relative motion between the parts of a machine______________? kinematics mechanisms applied mechanics theory of machines 49 / 50 A supercritical boiler is one that operates above the pressure and temperature of following values_____________________? 218 kg/cm2 abs and 540?C 218 kg/cm2 abs and 373?C 100 kg/cm2 and 540?C 1 kg/cm2 and 100?C 50 / 50 Forces are called coplanar when all of them acting on body lie in __________________? one plane perpendicular planes different planes one point 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 1 Mechanical Engineering Quiz 3Next
