0% 1 Mechanical Engineering Quiz 34 1 / 50 Rivets are generally specified by_______________? diameter of head length of rivet thickness of plates to be riveted nominal diameter 2 / 50 The leaks in a refrigeration system using Freon are detected by____________________? halide torch which on detection produces greenish flame lighting using reagents sulphur sticks which on detection gives white smoke smelling 3 / 50 The crest diameter of a screw thread is same as _____________________? major diameter minor diameter pitch diameter core diameter 4 / 50 Ignition timing of a multicylider petrol engine can be adjusted by_________________? adjusting the spark plug gap rotating the distributor adjusting ignition coil position rotating the crank 5 / 50 Emissivity of a white polished body in comparison to a black body is________________? higher same depends upon the shape of body lower 6 / 50 All the terms of energy in Bernoulli?s equation have dimension of_______________? length energy work mass 7 / 50 The flow in which conditions do not change with time at any point, is known as_________________? turbulent flow steady flow uniform flow one dimensional flow 8 / 50 Casting of a centrifugal pump is designed so as to minimize________________? friction loss static head loss of kinetic energy cavitation 9 / 50 The vapour pressure over the concave surface is______________________? zero greater than the vapour pressure over the plane surface equal to the vapour pressure over the plane surface less man the vapour pressure over the plane surface 10 / 50 Foundry crucible is made of_________________? lead graphite german silver mild steel 11 / 50 Efficiency of a Carnot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle_________________? 0.8 0.25 1.25 0.5 12 / 50 The output of a diesel engine can be increased without increasing the engine revolution or size in following way_________________? feeding more fuel increasing flywheel size heating incoming air supercharging 13 / 50 Boyle?s law i.e. pV = constant is applicable to gases under ___________________? steady change of pressures only small range of pressures all ranges of pressures high range of pressures 14 / 50 For an irreversible gas turbine cycle, the efficiency and work ratio both depend on___________________? both pressure ratio and maximum cycle temperature maximum cycle temperature alone pressure ratio alone minimum cycle temperature alone 15 / 50 Rupture stress is________________? breaking stress load at breaking point/A maximum load/original cross-sectional area load at breaking point/neck area 16 / 50 In the case of compression ignition engine, the %age of CO in exhaust gases is________________? Depends on load 5-10% Zero Considerable percent 17 / 50 Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value ___________________? (1 + moisture content) 1 + moisture content (1- moisture content) 1 ? moisture content 18 / 50 The major axis of elliptical manholes on the shell should be provided___________________? on dished end anywhere longitudinally circumferentially 19 / 50 Inter cooling in compressors__________________? enables compression in two stages cools the delivered air results in saving of power in compressing a given volume to given pressure is the standard practice for big compressors 20 / 50 Addition of copper to aluminium results in_____________________? improving machinability improvement of corrosion resistance one of the best known age and precipitation-hardening systems improvement of casting characteristics 21 / 50 The capacity of compressor will be highest when its intake temperature is___________________? anything. highest lowest atmospheric 22 / 50 Isothermal compression though most efficient, but is not -practicable because_________________? it does not increase pressure much ityrequires very big cylinder it is impossible in practice compressor has to run at very slow speed to achieve it 23 / 50 The unit of length in S.I. units is________________? meter kilometer centimeter millimeter 24 / 50 In the equation of virtual work, following force is neglected_______________________? reaction at a point or an axis, fixed in space, around which a body is con-strained to turn reaction of any smooth surface with which the body is in contact reaction of a rough surface of a body which rolls on it without slipping all of the above 25 / 50 Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is_________________? equal higher can?t be compared lower 26 / 50 The ultimate analysis of fuel lists _____________________? various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash 27 / 50 Statistical quality control techniques are based on the theory of___________________? quality statistics all of the above probability 28 / 50 A 75 cc engine has following parameter as 75 cc ___________________? lub oil capacity fuel tank capacity swept volume cylinder volume 29 / 50 The property of fluid by virtue of which it offers resistance to shear is called________________? surface tension viscosity adhesion cohesion 30 / 50 PERT stands for k (fit) project evaluation and review technique__________________? process execution and reporting technology project examination and review technique project execution and results technique project evaluation and reporting technique 31 / 50 Which of the following layouts is suited to job production__________________? fixed position layout plant layout product layout process layout 32 / 50 The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is______________________? flexible coupling universal coupling chain coupling Oldham?s coupling 33 / 50 The safe twisting moment for a compound shaft is equal to the _________________? extreme value maximum calculated value minimum calculated value mean value 34 / 50 Normal heptane_______________? does not affect auto-ignition has no relation with auto-ighition helps to resist auto-ignition accelerates auto-ignition 35 / 50 The forces, which meet at one point, but their lines of action do not lie in a plane, are called_________________? non-coplanar concurrent forces non-coplanar non-concurrent forces coplanar non-concurrent forces intersecting forces 36 / 50 A riveted joint in which the number otrivets decrease from innermost to outer most row is called__________________? criss-cross riveted joint chain riveted joint diamond riveted joint zig-zag riveted joint 37 / 50 Lower pairs are those which have___________________? point or line contact between the two elements when in motion two elements that permit relative motion elements of pairs not -held together mechanically surface contact between the two elements when in motion 38 / 50 The power available for take off and climb in case of turbojet engine as compared to reciprocating engine is ___________________? same less may be less or more depending on ambient conditons more 39 / 50 Tensile strength of a mild steel specimen can be roughly predicted from following hardness test_________________? Vicker Brinell Rockwell Shore?s sceleroscope 40 / 50 Which is the false statement about the properties of instantaneous center____________________? the two rigid links have no linear velocities relative to each other at the instantaneous centre the double centre can be denoted either by 02 or Ol2, but proper selection should be made at the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered the two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link 41 / 50 Balls for ball bearings are made of_________________? mild steel carbon-chrome steel cast iron stainless steel 42 / 50 To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use__________________? bevel gear spiral gear spur gear worm gear 43 / 50 The work ratio of simple gas turbine cycle depends on_________________? all of the above maximum cycle temperature pressure ratio minimum cycle temperature 44 / 50 The termal efficiency of a petrol engine at design load is around_________________? 40% 90% 30% 50% 45 / 50 High specific speed of turbine implies it is__________________? propeller turbine impulse turbine Francis turbine any one of the above 46 / 50 The simplex method is the basic method for__________________? model analysis value analysis operation research linear programming 47 / 50 Water contained in a beaker can be made to boil by passing steam through it__________________? at a pressure below the firuosphejric pressure at a pressure greater than atmospheric pressure at atmospheric pressure any pressure 48 / 50 In an ideal machine, the output as compared to input is_______________? equal more less may be less or more depending on efficiency 49 / 50 Enriched uranium is one in which__________________? %age of U234 has been artificially in-creased extra energy is pumped from outside %age of U has been artificially increased %age of U235 has been artificially in-creased 50 / 50 The basis for measuring thermodynamic property of temperature is given by___________________? third law of thermodynamics zeroth law of thermodynamics second law of thermodynamics first law of thermodynamics Provide Your Information Your score is The average score is 56% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMechanical Engineering Quiz 33 Mechanical Engineering Quiz 35Next
