0% 0 Mechanical Engineering Quiz 38 1 / 50 Which of the following laws is applicable for the behavior of a perfect gas__________________? Charles?law all of the above Boyle?s law Gay-Lussac law 2 / 50 The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is_________________? larger smaller equal larger/smaller depending on diameter of spring coil 3 / 50 Calorie is a measure of entropy specific heat thermal capacity quantity of heat 4 / 50 The reason for supercharging in any engine is to________________? increase efficiency effect fuel economy reduce weight and bulk for a given out-put increase power 5 / 50 The number of electrons in 1 cm3 of metal would be of the order of_______________? 1022 1010 TO16 1040 6 / 50 The moment on the pulley which produces rotation is called ___________________? torque moment of momentum inertia momentum 7 / 50 The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be_________________? 3 times more 2 times more 4 times more same in both cases 8 / 50 In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________? high, of the order of 25? any value as low as possible (3 to 11?C) zero 9 / 50 For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then_________________? perfectly tight vapour seal should be used refrigerant with lower evaporation temperature should be used bigger cabinet should be used smaller cabinet should be used 10 / 50 The effective power of gas turbines is increased by adding the following in compressor__________________? carbon dioxide ammonia and water vapour hydrogen nitrogen 11 / 50 Film coefficient is defined as Inside diameter of tube________________? Equivalent thickness of film Thermal conductivity Equivalent thickness of film Specific heat x Viscocity Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity Film coefficient x Inside diameter Thermalconductivity 12 / 50 The crown of the fire box is made hemispherical in order to___________________? give maximum space resist intense heat in fire box withstand pressure inside boiler , give maximum strength 13 / 50 Which of the following mechanisms produces mathematically an exact straight line motion____________________? Tchabichiff mechanism Grasshopper mechanism Peaucellier?s mechanism Watt mechanism 14 / 50 Relationship between the number of links (L) and number of pairs (P) is___________________? P = 2L-2 P = 2L + 4 P = 2L-4 P = 2L+2 15 / 50 Frederick W. Taylor introduced a system of working known as________________? line and staff organisation line organisation functional organisation effective organisation 16 / 50 For which of the following substances, the internal energy and enthalpy are the functions of temperature only____________________? perfect gas water saturated steam any gas 17 / 50 Steam in water tube boiler as compared to fire tube boiler_________________? is raised at same rate can be raised rapidly is raisd at slower rate could be raised at fast/slow rate depending on design 18 / 50 Phenomenon of choking in compressor means __________________? increased inclination of chord with air steam no flow of air reducing mass flow rate with increase in pressure ratio fixed mass flow rate regardless of pressure ratio 19 / 50 Short horizontal lines on pressure-enthalpy chart show__________________? constant pressure lines constant total heat lines constant entropy lines constant temperature lines 20 / 50 Which one of the following represents a group incentive plan ? Rowan Plan Taylor Differential Piece Rate System Bedaux Plan Scanlon Plan 21 / 50 Choose the wrong statement ? Temperature of medium being cooled must be below that of the evaporator All solar thermally operated absorption systems are capable only of intermittent operation frost on evaporator reduces heat transfer Refrigerant leaves the condenser as liquid 22 / 50 In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________? 80% 25% 50% 40% 23 / 50 Air refrigeration cycle is used in ____________________? commercial refrigerators air conditioning gas liquefaction domestic refrigerators 24 / 50 Freon group of refrigerants are___________________? toxic inflammable non-toxic and non-inflammable non-inflammable and toxic 25 / 50 The center of gravity of a triangle lies at the point of __________________? intersection of diagonals intersection of its altitudes intersection of bisector of angles concurrence of the medians 26 / 50 The value of Poisson?s ratio for cast iron is_________________? 0.25 to 0.33 0.23 to 0.27 0.1 to 0.2 0.4 to 0.6 27 / 50 Chilled cast iron has____________________? a low percentage of graphite a very high percentage of graphite graphite as its basic constituent of composition no graphite 28 / 50 Poise is the unit of________________? viscosity surface tension capillarity shear stress in fluids 29 / 50 If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to___________________? 1.25 x diameter of bolt 0.75 x diameter of bolt diameter of bolt 1.5 x diameter of bolt 30 / 50 Isothermal compression effeicency can be attained by running the compressor__________________? at average speed at zero speed at very slow speed at very high speed 31 / 50 In queuing theory, the nature of the waiting situation can be studied and analysed mathematically if_________________? the laws governing arrivals, service times, and the order in which the arriving units are taken into source are known complete details?of items in, waiting line are known all variables and constants are known and form a linear equation arrival and waiting times are known and can be grouped to form a waiting line model 32 / 50 Free cutting steels_____________________? are used where ease in machining is the criterion require least cutting force contain carbon in free form do not exist 33 / 50 If n = number of members andy = number of joints, then for a perfect frame, n =_________________? 2/-3 2j-l j-2 3/-2 34 / 50 The flow in which each liquid particle has a definite path and their paths do not cross each other is called__________________? uniform flow steady flow one dimensional flow streamline flow 35 / 50 The bulk modulus of elasticity with increase in pressure__________________? decreases remains constant increases increases first up to certain limit and then decreases 36 / 50 Which of the following has least value of conductivity_________________? water air glass plastic 37 / 50 Which of the following cycles is not a reversible cycle_____________________? none of the above Ericsson Stirling Carnot 38 / 50 Fuel oil consumption guarantees for I C engine are usually based on__________________? net calorific value of oil calorific value of fuel low heat value of oil high heat value of oil 39 / 50 The probability distribution of activity times in PERT follows following distribution__________________? binomial normal beta exponential 40 / 50 The lenght of Cornish boiler is of the order of _________________? 5-7.5 m 7-9 m 3-5 m 2-4 m 41 / 50 For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be___________________? infinity zero minimum maximum 42 / 50 Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________? not true true at full load true at part load true at both part and full load 43 / 50 Which of the following pipe joints would be suitable for pipes carrying steam_____________? flanged threaded expansion bell and spigot 44 / 50 When a body floating in a liquid, is displaced slightly, it oscillates about _________________? metacentre e.g. of body center of buoyancy center of pressure 45 / 50 Reheating of steam under ideal conditions takes place at constant __________________? enthaply pressure entropy temperature 46 / 50 All radiations in a black body are___________________? reflected transmitted refracted absorbed 47 / 50 Leakage past the piston rings and valve seats in I.C engines with increase in speed_______________? remains same decreases increases. unpredictable 48 / 50 The impact strength of a material is an index of its ___________________? capability of being cold worked hardness toughness tensile strength 49 / 50 The first unclear power plant in India is located at____________________? Kota Tarapur Baraeilly Kalapakkam 50 / 50 Isotopes of same elements have___________________? different chemical properties and same atomic numbers same atomic number and different masses different masses and different atomic numbers same chemical properties but different atomic numbers Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMechanical Engineering Quiz 37 Mechanical Engineering Quiz 39Next
