0% 5 Mechanical Engineering Quiz 4 1 / 50 A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if____________________? the floor is rough, the wall is smooth the floor and wall both are smooth surfaces the floor and wall both are rough surfaces the floor is smooth, the wall is rough 2 / 50 Installation of supercharger on a four-cycle diesel engine can result in the following percentage increase in power_____________? upto 25% upto 35% upto 50% upto 100%. 3 / 50 Material handling in automobile industry is done by_________________? overhead crane trolley belt conveyor all of the above 4 / 50 The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is____________________? bled gas from turbine is heated and readmitted for complete expansion compressed air before entering the combustion chamber is heated exhaust gases drive the compressor heated 5 / 50 Dynamic friction as compared to static friction is __________________? less same more may be less of more depending on nature of surfaces and velocity 6 / 50 Scavenging air in diesel engine means___________________? burnt air containing products of combustion forced air for cooling cylinder air used for combustion sent under pres-sure air used for forcing burnt gases out of engine?s cylinder during the exhaust period 7 / 50 In nuclear fission each neutron that causes fission releases_______________? at least one new neutron more than one new neutrons no new neutron one new neutron 8 / 50 According to Avogadro?s law, for a given pressure and temperature, each molecule of a gas_________________? occupies same volume occupies volume inversely proportional to its molecular weight occupies volume proportional to its specific weight occupies volume proportional to its molecular weight 9 / 50 Merit Rating is the method of determining worth of_______________? an individual employee machine a job a particular division in workshop 10 / 50 The economizer is used in boilers to _______________________? increase flue gas temperature increase thermal efficiency of boiler extract heat from the exhaust flue gases economise on fuel 11 / 50 The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________? less more or less depending on power rating same more 12 / 50 Uniform flow occurs when ___________________? the flow is steady size and shape of the cross section in a particular length remain constant the flow is streamline size and cross section change uniformly along length 13 / 50 In steel plant the most important system for materials handling is_____________________? locos conveyors cranes and hoists trucks 14 / 50 A cable with a uniformly distributed load per horizontal metre run will take the following shape_________________? elliptical parabola straight line hyperbola 15 / 50 Evaporative capacity of boiler is expressed as____________________? kg of steam produced steam pressure produced kg of fuel fired kg of steam produced per kg of fuel fifed 16 / 50 Pour point of fuel oil is the_________________? indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off temperature at which it solidifies or congeals minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame it catches fire without external aid 17 / 50 The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will___________________? may increase or decrease depending on other factors increase decrease be independent 18 / 50 Set screws are_________________? similar to small size tap bolts except that a greater variety of shapes of heads are available used to prevent relative motion be-tween parts slotted for a screw driver and generally used with a nut similar to stud 19 / 50 The lower pair is a_____________________? point contact pair open pair sliding pair closed pair 20 / 50 Carnot cycle has maximum efficiency for__________________? petrol engine reversible engine irreversible engine new engine 21 / 50 Thermal conductivity of air with rise in temperature__________________? increases decreases remains constant may increase or decrease depending on temperature 22 / 50 In which of the following layouts, the lines need to the balanced_______________? fixed position layout process layout product layout plant layout 23 / 50 One of the basic essentials of an incentive plan is that_________________? minimum wages should be guaranteed provide incentive to group efficiency performance all standards should be based on time studies a differential piece rate system should exist 24 / 50 Which of the following alloys does not have copper as one of the constituents________________? delta metal nichrome constantan monel metal 25 / 50 Pick up the wrong statement Fast breeder reactors__________________? operate at extremely high power densities. are liquid-metal cooled use water as coolant produce more fuel than they consume 26 / 50 Units of surface tension are____________________? it has no units distance energy/unit area both of the above 27 / 50 Which of the following is not the unit of pressure ? atmosphere newton kg/cm ata 28 / 50 A cable with a uniformly distributed load per horizontal meter run will take the following shape________________? parabola elliptical straight line hyperbola 29 / 50 It is not possible to use closed gas turbine cycle in aeronautical engines because_________________ ? it is inefficient it is bulky non of theses it requires cooling water for its operation 30 / 50 Runaway speed of a hydraulic turbine is_________________? the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open the speed corresponding to maximum overload permissible the speed at which turbine runner will be damaged full load speed 31 / 50 In malleable iron, carbon is present in the form of___________________? flakes cementite free carbon nodular aggregates of graphite 32 / 50 Grey cast iron_____________________? is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable is produced by annealing process. I is soft, tough and easily machinec metal 33 / 50 The amount of radiation mainly depends on___________________? nature of body type of surface of body all of the above temperature of body 34 / 50 Pick up false statement? In hit and miss governing, fuel supply is completely cut off during one or more number of cycles In quantity governing, air fuel ratio is almost constant and quantity of charge is changed depending on load In quality governing, quantity of fuel is varied to suit the load and total charge of air is varied For petrol and large gas engines, quantity governingds preferred 35 / 50 Gas cooled reactor uses following materials as moderator, and coolant____________________? graphite, C02 lead, H2 heavy water, C02 graphite, air 36 / 50 Multistage centrifugal pumps are used to obtain___________________? high discharge high head and high discharge pumping of viscous fluids high head 37 / 50 Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between_________________? drag and resultant force lift and resultant force lift and drag lift and tangential force 38 / 50 Addition of manganese to aluminium results in__________________? improvement of casting characteristics improvement of corrosion resistance one of the best known age and precipitation-hardening systems improving machinability 39 / 50 Fluid is a substance that___________________? has the same shear stress.at a point regardless of its motion cannot be subjected to shear forces cannot remain at rest under action of any shear force always expands until it fills any container 40 / 50 Buoyant force is___________________? force necessary to keep a body in equilibrium resultant force acting on a floating body equal to the volume of liquid displaced the resultant force on a body due to the fluid surrounding it 41 / 50 For supplying intermittent small quantity of air at high pressure, following compressor is best suited__________________? axial screw centrifugal reciprocating 42 / 50 Rotary compressors are suitable for ____________________? large discharge at high pressure large discharge at low pressure low discharge at low pressure low discharge at high pressure 43 / 50 Properties of substances like pressure, temperature and density, in thermodynamic coordinates are__________________? point functions path functions cyclic functions real functions 44 / 50 When crude oil is heated, then which of the following hydrocarbon is given off first______________? kerosene natural gas gasoline paraffin 45 / 50 On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be_________________? upwards at its upper end downwards at its upper end zero at its upper end perpendicular to the wall at its upper end 46 / 50 Which of the following fuels can be used in turbojet engines _____________________? high speed diesel oil liquid hydrogne demethylated spirit kerosene 47 / 50 The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________? slip factor velocity factor blade effectiveness velocity coefficient 48 / 50 Pick up the incorrect statement from the following? an activity of the project is denoted by an arrow on the net work the arrows are drawn (to scale from) left to right the head of the arrow indicates the end of,the activity! the tail of the arrow indicates the start of the activity 49 / 50 A dummy activity________________? is represented by a dotted line is artificially introduced all of the above does not require any time 50 / 50 The pressure ratio in gas turbines is of the order of__________________? 4:01 9:01 2:l 61:01:00 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 3 Mechanical Engineering Quiz 5Next
