0% 6 Mechanical Engineering Quiz 5 1 / 50 Separators in compressor installations are located_____________________? between after-cooler and air receiver before intercooler after intercooler after receiver 2 / 50 The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turine and fixed higher and lower temperature) with increase in pressure ratio will___________________? first increase, reach maximum and then decrease increase first at fast rate and then slow increase first at slow rate and then fast decrease continuously 3 / 50 Gas turbines for power generaion are normally used___________________? to supply base load requirements to supply peak load requirements to enable start thermal power plant in emergency 4 / 50 The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________? superheated wet dry remain dry satruated 5 / 50 Vapor compression refrigeration is some what like ____________________? none of the above reversed Camot cycle Rankine cycle Carnot cycle 6 / 50 Bell metal contains_____________________? 70-75% copper and rest tin 70% copper and 30% zinc 90% copper and 10% tin 85-92% copper and rest tin with little lead and nickel 7 / 50 Fatigue strength can be increased by__________________? grinding and lapping surface cold working hot working shot peening 8 / 50 Cam angle is defined as the angle_________________? during which the follower returns to its initial position of rotation of the cam for a definite displacement of the follower through which, the cam rotates during the period in which the follower remains in the highest position moved by the cam from the instant the follower begins to rise, till it reaches its highest position 9 / 50 If overhead clearance is less, then the following type of engine should be selected__________________? Vertical In-line Horizontal V-type 10 / 50 The vloumetric efficiency of compressor with increase in compression ratio will ___________________? may increase/decrease depending on clearance volume increase remain same decrease 11 / 50 A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of___________________? 0.134 r r/2 r/A r/% 12 / 50 Guest?s theory of failure is applicable for following type of materials_________________? brittle plastic elastic ductile 13 / 50 According to Kennedy?s theorem, if three bodies have plane motions, their instantaneous centers lie on___________________? a triangle two lines a straight line a point 14 / 50 Adiabatic process is________________? constant temperature process essentially an isentropic process reversible process non-heat transfer process 15 / 50 A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to_________________? 50 100 25 250 16 / 50 The value of modulus of elasticity for mild steel is of the order of________________? 2.1 X 106 kg/cm2 0.1 xlO6 kg/cm2 (<?) 3.8 x 106 kg/cm2 2.1xl05 kg/cm2 2.1 x 107 kg/cm2 17 / 50 The pistons are usually given a coating such as tin plating in order to________________? reduce friction reduce possibility of scoring conduct heat efficiently reduce weight 18 / 50 Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ? strong solution to weak solution ammonia vapour to weak solution strong solution to ammonia vapour weak solution to strong solution 19 / 50 Tensile strength of a material is obtained by dividing the maximum load during the test by the_________________? minimum area after fracture None original cross-sectional area area at the time of fracture 20 / 50 A metal with specific gravity of o floating in a fluid of same specific gravity a will____________________? sink to bottom be fully immersed with top surface at fluid surface partly immersed float over fluid 21 / 50 Value engineering aims at finding out the________________? resale value of a product break even point when machine re-quires change major function of the item and accomplishing the same at least cost without change in quality depreciation value of a product 22 / 50 Higher 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 ele-ments when in motion 23 / 50 Super heating in a refrigeration cycle __________________? other factors decide COP decreases COP COP remains unaltered increases COP 24 / 50 A cycle consisting of two adiabatics and two constant pressure processes is known as___________________? Otto cycle Stirling cycle Ericsson cycle Joule cycle 25 / 50 The building up of worn and uridersized parts, subjected to repeated loads by electroplating is_____________________? extremely hazardous cheapest method best method has no effect as regards fatigue strength 26 / 50 In turbo fan engine, the jet velocity as compared to turbo-jet engine is_________________? may be less or more depening upon speed less more same 27 / 50 Surface energy per unit area of a surface is numerically equal to _____________________? force of cohesion surface tension force of adhesion atmospheric pressure 28 / 50 The upper surface of a weir over which water flows is known is_____________________? sill nappe weir top crest 29 / 50 T Jie horse power transmitted by a belt is dependent upon _________________? tension on slack side of belt tension on tight side of belt all of the above radius of pulley 30 / 50 Brayton cycle consists? of following four processes____________________? two isentropics and two constant pres-sures two isothermals and two isentropics two isentropics, one constant volume and one constant pressure two isentropics and two constant volumes 31 / 50 Piston rings are usually made of___________________? cast iron phosphor bronze aluminium babbitt 32 / 50 For low speed operation or for idling in petrol engines, the engine requirements are for_______________? theoretically correct mixture rich mixture any type of mixture lean mixture 33 / 50 Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one___________________? ellipse parabola hyperbola circle 34 / 50 Malleable cast iron _________________? is produced by annealing process. It is soft, tough, and easily machined metal is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable contains l.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material 35 / 50 Which of the following is not an interns combustion engine___________________? 2-stroke petrol engine 4-stroke petrol engine steam turbine diesel engine 36 / 50 The flow rate in gear pump___________________? increases with increase in pressure decreases with increase in pressure more or less remains constant with in-crease in pressure unpredictable 37 / 50 PERT analysis is based on____________________? most likely time all of the above pessimistic time optimistic time 38 / 50 The condition of steam in boiler drum is always ___________________? dry saturated supersaturated wet 39 / 50 Thermal efficiency of a thermal power plant is of the order of___________________? 45% 15% 20% 30% 40 / 50 For slow-speed large capacity compressor, following type of valve will be best suited________________? poppet valve mechanical valve of the corliss, sleeve, rotary or semirotary type disc or feather type any of the above 41 / 50 Pick up the wrong statement about water tube boiler in comparison to fire tube boilers ______________________? former occupies less space for same power chances of explosion are less in former case rate of steam flow is more in former case former generates steam at high pressure 42 / 50 The m.e.p. of a diesel cycle having fixed compression ratio with increase in cut-off will_________________? be unaffected increase decreae depend on other factors 43 / 50 A safety valve in a locomotive starts leaking. The leaking medium will be_________________? water super heated steam wet steam dry steam 44 / 50 According to principle of moments__________________? the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point positive and negative couples can be balanced if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero if a system of coplanar forces is in equilibrium, then their algebraic sum is zero 45 / 50 The evolution of heat of solution takes place in ammonia absorption plant when _____________________? ammonia vapour is driven out of solution ammonia vapour goes into solution weak solution mixes with strong solution lithium bromide mixes with ammonia 46 / 50 The tendency of a liquid surface to contract is due to the following property_____________? viscosity adhesion cohesion surface tension 47 / 50 Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of__________________? 39.20% 68.80% 49.20% 84.80% 48 / 50 Kinetic theory of gases assumes that the collisions between the molecules are________________? perfectly elastic partly inelastic partly elastic perfectly inelastic 49 / 50 The water tubes in a babcock and wilcox boiler are__________________? vertical inclined horizontal and inclined horizontal 50 / 50 In a refrigeration system, heat absorbed in comparison to heat rejected is_________________? same more for small capacity and less for high capacity less more Provide Your Information Your score is The average score is 64% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMechanical Engineering Quiz 4 Mechanical Engineering Quiz 6Next
