0% 3 Mechanical Engineering Quiz 8 1 / 50 Mach number is significant in_____________________? simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship?s hulls supersonics, as with projectiles and jet propulsion full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. all of fhe above 2 / 50 Water and sediment in fuel oil can be removed by _______________________? burning the oil suspension cooling the oil in the settling tanks heating the oil in the settling tanks 3 / 50 Routing assists engineers in deciding in advance___________________? the methods of proper utilization of machines the layout of factory facilities the methods of proper utilization of manpower the flow of material in the plant 4 / 50 Drop forging dies contain carbon of the order of_________________? 0.25 to 0.5% 0.7 to 0.9% 0.6 to 0.7% 0.1 to 0.2% 5 / 50 During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is___________________? 22 tonnes/cm2 8 tonnes/cm2 16 tonnes/cm2 4 tonnes/cm2 6 / 50 Bomb calorimeter is used to determine ___________________? Higher calorific value at constant volume Higher calorific value at constant pressure Lower calorific value at constant volume , Lower calorific value at constant pressure 7 / 50 A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________? Brine Carbon dioxide Ammonia Freon 8 / 50 Heat flows from one body to other when they have_________________? different temperatures different heat contents different specific heat different atomic structure 9 / 50 Combustion in compression ignition engines is____________________? None laminar homogeneous heterogeneous 10 / 50 If n = number of members andy = number of joints, then for a perfect frame, n =________________? 2j-l j-2 3/-2 2/-3 11 / 50 The ratio of absolute viscosity to mass density is known as_________________? viscosity index specific viscosity coefficient of viscosity kinematic viscosity 12 / 50 Which is more viscous lub oil_________________? SEA 30 SAE 50 SAE 80 SAE 4? 13 / 50 A boiling water reactor uses following as fuel________________? plutonium thorium enriched uranium U 14 / 50 The compression ratio in a jet engine varies proportional to ____________________? speed altitude Vspeed speed 15 / 50 The C.G. of a plane lamina will not be at its geometrical centre in the case of a__________________? circle equilateral triangle right angled triangle square 16 / 50 The knock in diesel engine occurs due to____________________? instantaneous atuo iginition of last part of charge instantaneous and rapid burning of the first part of the charge reduction of delay period delayed burning of the first part of the charge 17 / 50 Cold rolled steel sheets contain carbon of the following order___________________? 0.20% 0.40% 0.10% 0.60% 18 / 50 Steel made from phosphatic iron is_________________? hard ductile brittle tough 19 / 50 A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t ? 4), the acceleration of the particle will be given by the equation __________________? 6f-8 6f-4 3t2+2t 3t2-lt 20 / 50 The draw of cotter need not exceed_________________? 20 mm 10 mm 3 mm 5 mm 21 / 50 Time study is__________________? machine setting time time taken by workers to do a job method of fixing time for workers the appraisal, in terms of time, of the value of work involving human effort 22 / 50 If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________? N/Zp p/ZN ZN/p Z/pN 23 / 50 Work study is concerned with_________________? improving production capability improving production planning and control improving present method and finding standard time motivation of workers 24 / 50 Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________? less power requirement lower volumetric efficiency less loss of air due to leakage past the cylinder better mechanical balance 25 / 50 The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________? increase remain unaffected decrease may increase or decrease depending on the type of refrigerant used 26 / 50 Critical Path Net Work helps an engineer_________________? to concentrate his attention on critical activities to be cautious for avoiding any delay in the critical activities to avoid delay of the whole project all of the above to divert the resources from non-critical advanced activities to critical activities 27 / 50 Capillary action is due to the_________________? surface tension all of the above cohesion of the liquid adhesion of the liquid molecules and the molecules on the surface of a solid 28 / 50 Antifriction bearings are__________________? sleeve bearings hydrodynamic bearings none of the above thin lubricated bearings 29 / 50 The difference of pressure between the inside and outside of a liquid drop is _______________? p = Txr p = T/2r p = 2T/r p = T/r 30 / 50 The stress at which extension of the material takes place more quickly as compared to the increase in load is called______________? breaking point of the material yielding point of the material elastic point of the material plastic point of the material 31 / 50 Molecular volume of any perfect gas at 600 x 103 N/m2 and 27?C will be ____________________? 41.7 m3/kg mol 0.15 m3/kg mol 4.17m3/kgmol 400 m3/kg mol 32 / 50 An engine indicator is used to determine the following___________________? temperature volume of cylinder speed m.e.p. and I.H.P. 33 / 50 Which of the following depreciation system ensures that the interest be charged on the cost of machine asset every year on the book value, but the rate of depreciation every year remains constant_____________________? A-B-C charging method sinking fund method annuity charging method straight line method 34 / 50 Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the_________________? force of cohesion force of adhesion force of friction force of diffusion 35 / 50 Micro motion study is__________________? motion study of a sequence of operations conducted systematically study of man and machine conducted simultaneously motion study* observed on enhanced time intervals analysis of a man-work method by using a motion picture camera with a timing device in the field of view 36 / 50 A chain comprises of 5 links having 5 joints. Is it kinematic chain ? data are insufficient to determine it yes no it is a marginal case 37 / 50 Work done is zero for the following process_________________? throttling constant volume all Of the above free expansion 38 / 50 Presence of moisture in a refrigerant affects the working of___________________? evaparator expansion valve compressor condenser 39 / 50 String diagram is used when__________________? team of workers is working at a place all of the above idle time is to be reduced material handling is to be done 40 / 50 An example of amorphous material is____________? silver zinc glass lead 41 / 50 The main advantage of line organisation is its_______________? effective command and control all of the above rigid discipline in the organisation defined responsibilities at all levels 42 / 50 A large Roynold number is indication of________________? laminar flow highly turbulent flow smooth and streamline flow steady flow 43 / 50 According to Avogadro?s Hypothesis ______________________? gases have two values of specific heat the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature the sum of partial pressure of mixture of two gases is sum of the two product of the gas constant and the molecular weight of an ideal gas is constant 44 / 50 Density of water is maximum at__________________? 0?C 100?C 0?K 4?C 45 / 50 Detonation is caused by the following unstable compounds______________________? peroxides, aldehydes, oxides and sul-phides peroxides, aldehydes and ketones ketones and sulphur compounds aldehydes, oxides and ketones 46 / 50 Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to________________? static loading combined static and dynamic loading dynamic loading completely reversed loading 47 / 50 A nuclear unit becoming critical means_______________? it is generating power to rated capacity chain reaction that causes automatic splitting of the fuel nuclei has been established there is danger of nuclear spread it is capable of generating much more than rated capacity 48 / 50 The mean effective pressure obtained from engine indicator indicates the________________? average pressure instantaneous pressure at any instant maximum pressure developed minimum pressure 49 / 50 A two stroke crank compressed engine has following ports in the cylinder_______________? suction port, exhaust port and transfer port suction port and exhaust port transfer port only suction port and transfer port 50 / 50 A key capable of tilting in a recess milled out in a shaft is known as______________________? gib head key wood-ruff key flat saddle key feather key Provide Your Information Your score is The average score is 83% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMechanical Engineering Quiz 7 Mechanical Engineering Quiz 9Next
