0% 3 Mechanical Engineering Quiz 12 1 / 50 Change in enthalpy of a system is the heat supplied at___________________? constant pressure constant temperature constant volume constant entropy 2 / 50 If petrol is used in a diesel engine, then______________? higher knocking will occur low power will be produced efficiency will be low black smoke will be produced 3 / 50 On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by_______________? curved line straight inclined line vertical straight line horizontal straight line 4 / 50 Specific heat of air at constant pressure is equal to___________________? 1 0.17 0.24 0.21 5 / 50 If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water________________? 52.2 cm 51 cm 52 cm 50 cm 6 / 50 The main interest of shielding in nuclear reactor is protection against_______________? neutrons and gamma rays infra-red rays X-rays a, P, and y rays 7 / 50 A fast breeder reactor uses following as fuel_________________? U235 enriched uranium thorium plutonium 8 / 50 Which is the false statement about wrought iron. It has________________? ability of hold protective coating uniform strength in all directions high ductility high resistance to rusting and corrosion 9 / 50 Points of arrest for iron correspond to__________________? there is nothing like points of arrest stages at which properties do not change with increase in temperature stages at which further heating does not increase temperature for some time stages at which allotropic forms change 10 / 50 The jnaximum combustion pressure in gas turbine as compared to I.C engine is_________________? more same less depends on other factors 11 / 50 In a free vortex motion, the radial component of velocity everywhere is________________? minimum maximum non-zero and finite zero 12 / 50 True one-dimensional flow occurs when_________________? the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive 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 plane the direction and magnitude of the veiocity at all points are identical 13 / 50 For pipes, laminar flow occurs when Roynolds number is__________________? more than 4000 less than 2000 between 2000 and 4000 less than 4000 14 / 50 In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia of rivet d should be equal to__________________? 1.5 d 1.75 d 1.25 d d 15 / 50 Working principle of dead weight pressure gauge tester is based on_______________? Pascal?s law Avogadro?s hypothesis Dalton?s law of partial pressure Newton?s law of viscosity . 16 / 50 Induction hardening is the process of_____________________? inducing hardness by continuous process increasing hardness throughout hardening surface of workpiece to ob-tain hard and wear resistant surface heating and cooling rapidly 17 / 50 Which of the following cycles uses air as the refrigerant__________________? Bell-coleman Ericsson Stirling Carnot 18 / 50 The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called__________________? overall efficiency efficiency ratio net efficiency relative efficiency 19 / 50 The example of higher pair is_________________? gears, cams belt, rope and chain drives all of the above ball and roller bearings 20 / 50 Specific weight of water in S.I. units is equal to ________________? 9.81 xlO6N/m3 10000 N/m3 9.81 xlO3 N/m3 1000 N/m3 21 / 50 Thermal conductivity of glass-wool varies from sample to sample because of variation in ________________ ? density all of the above composition porosity 22 / 50 If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its__________________? specific gravity specific weight specific mass specific density 23 / 50 Stefan Boltzmann law is applicable for heat transfer by __________________? conduction and radiation combined radiation convection conduction 24 / 50 Which of the following instrument can be used for measuring speed of a submarine moving in deep sea__________________? Venturimeter Orifice plate hot wire anemometer pitot tube 25 / 50 Ultimate analysis of fuel is determination of percentage of____________________? higher calorific value fixed carbon, ash, volatile matter, moisture carbon, hydrogen, nitrogen, sulphur, moisture lower calorific value 26 / 50 The coefficient of performance is the ratio of the refrigerant effect to the_________________? heat of compression work done by compressor enthalpy increase in compressor all of the above 27 / 50 According to fan laws, at constant speed and capacity, the pressure and power vary_____________________? inversely as square root of density inversely as density as square of density directly as the air or gas density 28 / 50 Shear stress induced in a shaft subjected to tension will be__________________? none of the above maximum at center maximum at periphery and zero at center uniform throughout 29 / 50 If value of n is infinitely large in a polytropic process pV? = C, then the process is known as constant_____________________? enthalpy temperature pressure volume 30 / 50 Which is not correct statement about effect of sulphur in fuel ___________________? it helps in electrostatic precipitation of ash in flue-gases it has heating value None it erodes furnace walls 31 / 50 The proximate analysis of fuel lists__________________? fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight 32 / 50 Applications in which stresses are encountered in one direction only uses following type of threads____________________? acme metric buttress square 33 / 50 The number of centers in a crank driven slider crank mechanism are_______________? 6 2 0 4 34 / 50 Diesel engines as compared to petrol engines require ______________________? smaller flywheel no flywheel same size flywheel bigger flywheel 35 / 50 Which of the following is used for bearing liner_______________? babbit metal bronze gun metal bell metal 36 / 50 The values of velocity and acceleration of piston at near dead center for a slider-crank mechanism will be________________? 0, and less than coV cor, 0 0, and more than co2r 0, 0 37 / 50 When the flow parameters at any given instant remain same at every point, then flow is said to be___________________? quasi static steady state laminar uniform 38 / 50 A circular bar moving in a round hole is an example of_______________? partially constrained motion incompletely constrained motion completely constrained motion successfully constrained motion 39 / 50 If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm?, the pressure at a depth of 50 m below the oil surface will be_________________? 5 meters of water column 3 meters of water column 2 meters of water column 6 meters of water Column 40 / 50 The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be ________________? 1500 kg 1000 kg 2000 kg 500 kg 41 / 50 Peaucellier mechanism has__________________? six links eight links twelve links four links 42 / 50 Volumetric efficiency of a compressor without clearance volume________________? may increase/decrease depending on compressor capacity is not dependent upon compressin ratio increases with increase in compression ratio decreases with increase in compression ratio 43 / 50 For pipes, turbulent flow occurs when Reynolds number is _____________________? less than 4000 more than 4000 less than 2000 between 2000 and 4000 44 / 50 A reactor capable of converting a ferrite material into fissile isotopes is called____________________? fast breeder reactor boiling water reactor regenerative reactor breeder reactor 45 / 50 In a darg link quick return mechanism, the shortest link is always fixe The sum of the shortest and longest link is _______________? there is no such relationship equal to sum of other two greater than sum of other two less than sum of other two 46 / 50 The difference between cornish boiler and lancashire boiler is that_________________? former contains one fire tube and latter contains two fire tubes former is water tube type and latter is fire tube type None former is fire tube type and latter is water tube type boiler 47 / 50 The COP of a vapor compression plant in comparison to vapor absorption plant is ________________? more less same more/less depending on size of plant 48 / 50 Carbonation of coal is the process of________________________? pulverising coal in inert atmosphere strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel heating wood in a limited supply of air at temperatures below 300?C binding the pulverised coal into brick-ettes 49 / 50 The stress induced in a body due to suddenly applied load compared to when it is applied gradually is________________? two times half same four times 50 / 50 In loop scavenging, the top of the piston is________________? depressed contoured slanted flat Provide Your Information Your score is The average score is 79% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMechanical Engineering Quiz 11 Mechanical Engineering Quiz 13Next
