0% 1 Mechanical Engineering Quiz 35 1 / 50 Normal depth in open channel flow is the depth of flow corresponding to_______________? steady flow laminar flow uniform flow unsteady flow 2 / 50 According to Bernoulli?s equation for steady ideal fluid flow____________________? velocity and pressure are inversely proportional the energy is constant along a stream-line but may vary across streamlines total energy is constant throughout principle of conservation of mass holds 3 / 50 The advantage of dry compression is that________________? it results in high volumetirc and mechanical efficiency it permits complete evaporation in the evaporator all of the above it permits higher speeds to be used 4 / 50 For water, at pressures below atmospheric___________________? melting point rises markedly and boiling point drops markedly melting point drops slightly and boiling point drops markedly melting point drops slightly and boiling point drops slightly melting point rises slightly and boiling point drops markedly 5 / 50 Inconel is an alloy of___________________? nickel, chromium nickel, chromium and iron nickel, zinc nickel, copper 6 / 50 In carburettors, the top of the fuel jet with reference to the level in the float chamber is kept at_________________? may be anywhere slightly higher level slightly lower level same level 7 / 50 Chromium in steel_________________? improves wear resistance, cutting ability and toughness gives ductility, toughness, tensile strength and anticorrosion properties improves cutting ability and reduces hardenability refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties 8 / 50 Vanadium in high speed steels__________________? promotes retention of austenite forms very hard carbides and thus in-creases wear resistance promotes decarburisation provides high hot hardness 9 / 50 The more effective way of increasing efficiency of Carnot engine is to____________________? decrease higher temperature increase lower temperature increase higher temperature decrease lower temperature 10 / 50 A boiler in India should conform to safety regulations of__________________? IBR DIN BS ASTM 11 / 50 Uniform flow occurs when_____________________? the direction and magnitude of the velocity at all points are identical the velocity of successive fluid paiticles, at any point, is the same at successive periods of time the magnitude and direction of the velocity do not change from point to point in the fluid the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each pleasure 12 / 50 The thermodynamic efficiency of rotary compressor is based on_______________? polytropic compression isothermal compression adiabatic compression isentropic compression 13 / 50 Which of the following incentive plansrensures a part of the swing to the worker and rest to the employer_______________? Emerson efficiency plan Taylor plan None Halsey premium plan 14 / 50 Which one of the following represents a group incentive plan ? Lincoln Plan Halsey Premium Plan Rowan Plan Bedaux Plan 15 / 50 The weakest section of a diamond riveting is the section which passes through ___________________? one rivet hole of the end row the second row the first row the central row 16 / 50 Klein?s construction gives a graphica construction for________________? slider-crank mechanism acceleration polygon four bar chain mechanism velocity polygon 17 / 50 Differential monometer is used to measure___________________? pressure in pipes, channels etc. difference of pressure between two points atmospheric pressure very low pressure 18 / 50 A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as______________________? diamond riveted joint zig-zag riveted joint criss-cross riveted joint chain riveted joint 19 / 50 A closed system is one in which_________________________? both energy and mass cross the boundaries of the system mass does not cross boundaries of the system, though energy may do so mass crosses the boundary but not the energy neither mass nor energy crosses the boundaries of the system 20 / 50 The number of flue tubes in Lancashire boiler is_________________? one zero two four 21 / 50 Principle of similitude forms the basis of_________________? hydraulic designs comparing two identical equipments designing models so that the result can be converted to prototypes comparing similarity between design and actual equipment 22 / 50 The pressure angle of a cam depends upon___________________? lift of follower angle of ascent all of the above offset between centre lines of cam and follower 23 / 50 Delta metal is an alloy of__________________? iron, lead and tin copper, zinc and iron iron, aluminium and magnesium iron, nickel and copper 24 / 50 Lancashire boiler is of____________________? all of the above horizontal type natural cirulation type stationary<fire tube-type 25 / 50 All heat engines utilize_____________________? calorific value of fuel net claorific value of oil high heat value of oil low heat value of oil 26 / 50 The compressor efficiecny is the__________________? isothermal H.P./shaft H.R compression work/motor input total output/air input isothermal H.P/indicated H.R 27 / 50 The continuity equation is connected with__________________? conservation of mass compressibility of fluids steady/unsteady flow viscous/unviscous fluids 28 / 50 Domestic refrigerator working on vapour compression cycle uses the following type of expansion device____________________? manually operated valve electrically operated throttling valve capillary tube thermostatic valve 29 / 50 In order to prevent formation of carbon on the injector, the temperature of nozzle tip should be__________________? less than 100?C between 100-250?C between 400 ? 500?C between 250 ? 300?C 30 / 50 Green coal, in order to be burnt, must be____________________? burnt in excess air heated to its ignition point heated sufficiently burnt as powder 31 / 50 The ignition coil in diesel engines produces voltage of the order of________________? 20,000 volts 240 volts 1000 volts 6 to 12 volts 32 / 50 The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be_____________________? lower same depends on size of engine higher 33 / 50 In a shaper mechanism, the Corioli?s component of acceleration will_______________? exist not exist depend on position of crank unpredictable 34 / 50 According to Dalton?s law, the total pres sure of the mixture of gases is equal to________________? average of the partial pressures of all sum of the partial pressures of all sum of the partial pressures of all divided by average molecular weight greater of the partial pressures of all 35 / 50 In jet propulsion power unit, the inlet duct of diverging shape is used in order to _______________ ? beautify the shape provide robust structure convert kinetic energy of air into pres-sure energy collect more air 36 / 50 Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts_______________? theory of machines mechanisms kinetics applied mechanics 37 / 50 The ideal efficiency of a Brayton cycle without regeneration with increase ni pressure ratio will_________________? increase increase/decrease depending on application remain unchanged decrease 38 / 50 According to Wien?s law, the wavelength corresponding to maximum energy is proportion to ________________? t absolute temperature (T) f I2 39 / 50 Boiler parameters are expressed by ___________________? tonnes/hr. of steam pressure of steam in kg/cm2 all of the above temperature of steam in ?C 40 / 50 A wet vapour can be completely specified by__________________? pressure and dryness fraction dryness fraction only pressure only temperature only 41 / 50 A heat exchange process in which the product of pressure and volume remains constant is known as_______________? isentropic process heat exchange process hyperbolic process throttling process 42 / 50 In forced recirculation type boiler__________________? water is converted into steam in one pass without any recirculation feed pump is employed to supplement natural circulation in water wall type furnace 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 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 43 / 50 Ignition quailty of petrol is expressed by___________________? calorific value cetane number self ignition temperature octane number 44 / 50 In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is_________________? more less more/less depending on composition same 45 / 50 For applications involving high stresses in one direction only the following type of thread would be best suited______________________? square thread acme thread ISO metric thread buttress thread 46 / 50 At very low temperature, the melting and boiling temperatures become equal. This temperature is____________________? 303?K 373?K 0?K. 273.16?K 47 / 50 Which of the following boilers is best suited to meet fluctuating demands___________________? lancashire babcock and wilcox cochran locomotive 48 / 50 Rain drops are spherical because of__________________? air resistance surface tension forces viscosity atmospheric pressure 49 / 50 A two stroke engine is usually identified by__________________? size of flywheel absence of valves type of lubrication system weight of engine 50 / 50 Pick up the correct statement ? gas turbine uses low air-fuel ratio to economise on fuel gas turhine uses high air-fuel ratio to reduce outgoing temperature gas turbine uses low air-fuel ratio to develop the high thrust required all of the above Provide Your Information Your score is The average score is 72% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMechanical Engineering Quiz 34 Mechanical Engineering Quiz 36Next
