0% 2 Mechanical Engineering Quiz 25 1 / 50 Sulphur in steel________________? lowers the toughness and transverse ductility acts as deoxidiser reduces the grain size decreases tensile strength and hardness 2 / 50 Admiralty gun metal contains__________________? 88% copper, 10% tin and rest zinc alloy of tin, lead and cadmium 63 to 67% nickel and 30% copper iron scrap and zinc 3 / 50 Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be_______________? 2000 kg 8000 kg 1000 kg 4000 kg 4 / 50 The difference between the time available to do the job and the time required to do the job, is known as_________________? constraint duration event float 5 / 50 Hardness of steel depends on_________________? amount of carbon it contains contents of alloying elements the shape and distribution of the car-bides in iron method of fabrication 6 / 50 In nitrated parts, the origins of the fatigue cracks will occur at__________________? none of the above within the core surface just below the surface 7 / 50 The machinability of steel is increased by___________________? phosphorous and aluminium sulphur, graphite and aluminium phosphorous, lead and sulphur silicon and sulphur 8 / 50 Queuing theory is used for____________________? all of the above inventory problems traffic congestion studies job-shop scheduling 9 / 50 In diesel engine, the compression ratio in comparison to expansion ratio is_______________? less same more variable 10 / 50 If a spring is cut down into two springs, the stiffness of cut springs will be _________________? half double same unpredictable 11 / 50 The air-fuel ratio in petrol engines-is controlled by__________________? controlling valve opening/closing carburettion governing injection 12 / 50 Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to________________? T Vr J2 j 13 / 50 In above example, the minimum length of the coupler will be__________________? slightly more than 45 mm slightly less than 45 mm 45 mm 95 mm 14 / 50 Cooling water is required for following equipment in ammonia absorption plant__________________? condenser condenser, absorber and separator (rectifier) evaporator absorber 15 / 50 Standard air is the air at_____________________? 20?C and 1 kg/cm2 and relative humidity 36% 0?C and standard atmospheric conditions atmospheric conditions at any specific location 15?C and 1 kg/cm2 16 / 50 The discharge through a reaction turbine with increase in unit speed____________________? remains unaffected decreases first increases and then decreases increases 17 / 50 In heat transfer, conductance equals conductivity (kcal/hr/sqm/?C/cm) divided by ________________? sqm (area) hr (time) cm (thickness) ?C (temperature) 18 / 50 Which of the following manometer has highest sensitivity_________________? U-tube with mercury micro-manometer with water inclined U-tube U-tube with water 19 / 50 Extensive property of a system is one whose value______________________? does not depend on the mass of the system, like temperature, pressure, etc. is not dependent on the path followed but on the state depends on the mass of the system like volume is dependent on the path followed and not on the state 20 / 50 Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts___________________? applied mechanics mechanisms theory of machines kinetics 21 / 50 The mathematical technique for finding the best use of limited resources in an optimum manner is known as___________________? linear programming queuing theory operation research network analysis 22 / 50 Choose the wrong statement? Viscosity is due primarily to interaction between fluid molecules Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force Viscosity of liquids decreases with in-crease in temperature Viscosity of liquids is appreciably affected by change in pressure 23 / 50 Stoichiometric quantity of air is the___________________? air present in atmosphere at NTP conditions air required for complete combustion of fuel with no excess air air required to convert CO into C02 air required for optimum combustion so as to have reasonable excess air 24 / 50 Barometer is used to measure__________________? pressure in pipes, channels etc. very low pressure atmospheric pressure difference of pressure between two points 25 / 50 Expanding steam to a very low pressure (high vacuum) in steam engines is _________________? uneconomical essential economical desirable 26 / 50 Pressure ratio in gas turbines is the ratio of ____________________? inlet pressure to exhaust pressure compressor pressure ratio highest pressure to exhaust pressure pressures across the turbine 27 / 50 An ideal regenerative cycle is ______________________? less than carnot cycle could be anything more than carnot cycle equal to carnot cycle 28 / 50 The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called_______________? buoyancy upthrust reaction metacentre 29 / 50 Choose the correct statement? Precooling and subcooling bf refrigerant are same If operating temperature of system is low, then refrigerant with low boiling point should be used Superheat and sensible heat of refrigerant are same A refrigerant should have low latent heat 30 / 50 If the radius of wire stretched by a load is doubled, then its Young?s modulus will be_______________? halved become four times doubled remain unaffected 31 / 50 Which is false statement about case hardening. Case hardening is done by_______________? cyaniding nitriding electroplating induction hardening 32 / 50 1 kg.m is equal to_________________? 427 Joules 9.81 Joules All Joules 102 Joules 33 / 50 When a reactor becomes critical, then the production of neutrons is_________________? initiated infinite exactly balanced by the loss of neutrons through leakage zero 34 / 50 Elements of pairs held together mechanically is known as ___________________? open pair rolling pair closed pair mechanical pair 35 / 50 Diesel fuel, compared to petrol is_________________? less difficult to ignite highly ignitable more difficult to ignite just about the same difficult to ignite 36 / 50 For measuring flow by a venturimeter, if should be installed in __________________? vertical line horizontal line in any direction and in any location inclined line with flow downward 37 / 50 In detennining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than____________________? two members with unknown forces of the frame four members with unknown forces of the frame three members with unknown forces of the frame three members with known forces of the frame 38 / 50 Which of the following is the case of heat transfer by radiation ___________________? blast furnace heating of building heat received by a person from fireplace cooling of parts in furnace 39 / 50 The permissible stress for carbon steel under static loading is generally taken as__________________? 3000-4000 kg/cm2 7500-10,000 kg/cm2 4000-4500 kg/cm2 2000-3000 kg/pm2 40 / 50 A mechanism is an assemblage of ____________________? four links or more than four links three links two links all of the above 41 / 50 Energy can neither be created nor destroyed but can be converted from one form to other is inferred from_________________? basic law of thermodynamics first law of thermodynamics second law to thermodynamics zeroth low of thermodynamic 42 / 50 The notch angle of the Izod impact test specimen is________________? 30? 20? 10? 45? 43 / 50 Maximum percentage of carbon in ferrite is___________________? 0.10% 0.06% 0.03% 0.25% 44 / 50 The reasons which are basically responsible for the formation of a queue should be that ___________________? output rate is linearly proportional to input the average service rate Hess than the average arrival rate all of the above output rate is constant and the input varies in a random manner 45 / 50 The C.G. of a plane lamina will not be at its geometrical centre in the case of a __________________? square right angled triangle equilateral triangle circle 46 / 50 The effort required to lift a load W on a screw jack with helix angle a and angle of friction Wtan(a + ) Wsin(a + ) Wcos(a + ) Wtan(a-) 47 / 50 Gun metal contains__________________? 70-78% copper and rest tin 90% copper and 10% tin 70% copper and 30% zinc 85-92% copper and rest tin with little lead and nickel 48 / 50 If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be________________? h w/h h/w wh 49 / 50 The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents_____________________? metering of the refrigerant liquid compression of the refrigerant vapour condensation of the refrigerant vapour evaporation of the refrigerant liquid 50 / 50 The edges of a boiler plate are bevelled to an angle of______________? 30? 60? 45? 80? 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