BEL MECHNICAL PAPER 2014
[1]. brake used in railway wagons. . ........
a. electric brake
b.band and drum brake...
[2] absolute zero pressure occurs at . ..
(a) at sea level
(b) at earth center
(c) when molecular momentum becomes zero.......
[3]. four masses , each of mass "a" are placed at each corner of a square , then
moment of inertia about a plane perpendicular to square and axis passing
throghcenter of sqaure........
[4]..Working of HYDRAULIC RAM is simmilar to......(reciprocating pump)
[5] In centrifugal pump , at the exit of impeller type of flow is.....( radial/free
vortex/forced/rectilinear)
[6] Calculate specific speed of turbine, H=275 m, p=3600kw N=400rpm( values not
sure )
[7] Hot tear is…… ( casting defect)
[8] For angular measurements which instrument is used …… (Bevel protractor …..
[9] Electric brakes are used in
(a) Trailers (b)cars (c) trucks
[10] spot facing is used for ………..
[11] Templates are used for
(a) copying the complex files
(b) for the ease of operation
(c) for routing…
[12] Problem on ROP (Re Order Point)
[13] What happens when petrol is used in diesel engine-----(high knocking/black
smoke/ efficiency dedreases…)
[14] In IC Engines for scavenging process thrust is provided by ( movement of
piston)
[15] In IC Engine when compared to outlet valve inlet valve is…(smaller)
[16] top piston ring on Piston is COMPRESSION RING
----DESIGN----
[17] Axial thrust is zero in which gear ….helical/spiral/bevel/worm
[18] Gear shaper is used for shaping ………………. Internal/ external /accuracy
[19] quickreturn mechanism is used in .MIling / Grinding /Broacghing /bloatter
[20] Power to weight ratio of diesel engine as compared to petrol engine
(high/low/same)
[21] Problem on finding metacentric height given cylinder height radius and specific
gravity
[22] Buoyancy force depends on (weight of the liquid displaced)
[23] Buoyance force means…………..
[24] Failure of metal below the yield point is (fatigue)
[25] Problem on finding life of bearing (cycles)
[26] fatigue strength of a material can be improved by process? SHOTPEENING
[27] paddle wheel problem ..worktransferd to systemand heat transferd to the
surrundings are given, we hv to find work done by system
[28] problem of turbine SFEE , change in H,U,K.E, P.E given…find the work done by
turbine
[29] Mild steel is (low/high carbon steel?)
[30] which of the following is softer and having less strength (austeninte, cementite ,
pearlite ?)
[31] Austempering is used to produce {50%austenite, 50%bainite /100% bainite
etc..??)
[32] moreMaleable metal (brass/copper/tin)
[33] which of the fallowing can be drawn to wire (cu/ ??)
[34] COP of domestic refrigerator compared to AC
[35] springs are parallel, effective stiffness….(2*K)
[36] footstep bearing in vertical turbine is (Partially/completely/successfully/not
constrained motion ?
[37] rubbing velocity of joint with opposite moving links------- (Wa+Wb)* r
[38] for balancing reciprocating masses which are to be balanced----primary force ,
couple, secondary force and couple….
[39] closed cycle gas turbine is (more flexible/ less flexible/ is used when gas ??)
[40] refrigeration vapour compression cycle works on (reverse carnot cycle/ reverse
rankine cycle ??)
[41] one of the principal stress is zero what is the value of other principal stress
(twice of shear stress)
[42] shear stress is (half of the difference of the principal stress)
[43] Slenderness ratio is less than 32 is called (short/long/ column??)
[44] creep on belt drive is caused due to (large driver shaft/ uneven expansion
contration of belt etc ??)
[45] maximum power transmission on beltdrive when centrifugal tension is …(3
times)
[46] to avoid cavitation in centrifugal pump (pressure on suction or delivery side is
low/ high?)
[47] coefficient of discharge vs coefficient of velocity (high or low :?:)
[48] rotameter is used for FLOW measurement
[49] roughness in drawings is represented by TRIANGLES
[50]in ABC analysis maximum concentration is on (materials which consumes more
money/ high demand/which has no value :? )
[51] truck moving on curved path given radus, coefficnet of friction find velocity of
the truck ? r=100m ,u=0.5
[52] screw is specified by (major diameter X pitch }
[53] washer is used for {more bearing area/cushioning effect ??}
[54] BHP of petrol engine is nearly (value like 83% etc ??)
[55] thermal diffusivity is…
[56] heat transfer takes place according to (second law of thermodynamics )
[57] Bernoulli's equation is based on (conservation of energy)
[58] Euler equation in fluid mechanics (conservation of linear momentum)
[59] Ideal fluid is (in viscid or incompressible or both??)
[60] shear stress in shaft subjected to tension (I guess its torsion) is ….max at
surface nd zero at center / uniform throughout…
[61] Medium specific speed turbine is (francis)
[62] problem on composite sphere, given ratio of thermal conductivites , ratio of
diameters is given, asked to findout temperature drop in two layers?
[63] springs in clutch is for (reduce torsional vibration / reduce speed of vechicle/
reduce jerk in start/ all):?
[64] work done is zero in (throttling/ constant volume/ all}
[65] to specify the state of saturated steam properties needed (temp alone/ pressure
alone/ T and P/ pressure and dryness fraction }
[66] Bleeding in turbine refers to
[67] brake bleeding refers to (removing excess air/ ex cess pressure/ vaccum ??}
[68] nozzle at entry (subsonic/supersonic ??)
[69] why ice sometimes look white (due to air /etcetc )
[70] thermal conductivity of which of the following is higher (steam/melting ice/ solid
ice/ water ):?
[71] sensible heat , relative humbidity (constant/nc/ dec ??)
[72] temperature at which water vapour in air starts condensing (DPT)
[73] carnot cycle efficiency depends on (temperature range)
[74] cetane number refers to ( ignition quality/ calorific value of fuel / ?? )
[75] surface contact means (lower pair)
[76] tool signature refers to (completespecification of tool/ mathematical
reprentation ??? )
[77] tungsten is added for (hot hardness temperature)
[78] hot working temperature is (above recrystallization temperature)
[79] Dielectric fluid used in EDM (kerosene)
[80] flux used in brazing (liquid/ paste/poweder ??)
[81] electrode diameter compared to arc ??? (twice/ half/ 2.5/equal )
[82] seam welding is (continuos spot welding)
[83] naturally available abrasive is (siC/ al2o3??)
[84] product layout is used for (bath production/ continuous production/ utility of
machine/. all of these)
[85] queuing theory is related to (waiting time )
[86] problem on EOQ
[87] break even analysis consists of (fixed cost /var/ fix n var/ non)
[88] In spring-mass system natural frequency of mass included spring when
compared to mass less one ………(Less)
[89] dM/dx = shear force
[90] hoop stress is CIRCUMFERENTIAL TENSILE STRESS
[91] carbon steel is (alloy of steel and carbon with proportion of suphur n
phosporuous ???)
[92] name of boiler accessories
[93] engine chamber is fitted with ??
[94] hydraulic accumulator is used for (oil accumulation /?/?/?
[95]sands are classified according to (source of origin/ grain size and clay content/
permeability number
[96] non destructive test (chapry/ tension test/ impact test/ cupping test )
[97] divergenceangle of draft tube (less 8, more 8, less 15, more 15)
[98] contact between gears while meshing (rotation. Sliding. Partly both )
[99] lewis equation is used to findout (bending stress , compressive stress/ contact/
enurance stress )
[100] water droplets – surface tension
[101] PV=C is what process (hyperbolic)
[102] flexible coupling is used to (reduce the transmission shock/ to completely
reduce the shock and reduce the stress reversal )
[103] universal joint (angle torque transmission )
[104] bush used in flexible coupling paint brust (aluminium/ gunmetal/ )
[105] rear axle of heavy trucks is generally (rigid/ semi floating/ floating/3 parts )
[106] shock absorbers is used for (absorbing/ dissipating/ releasing energy)
[107] node is a point where (vibration is zero )
[108] factor of safety is---- yield stress/ allowable stress
[109] cryogenics means—( engineering field deals with liquids below -150dgecent)
[110] crystal imperfection ----( dislocation)
[111] Sensible heat is required to………convert water to steam / vapour to liquid/
raise the temperatute…..
[112] Guide vanes are used for.........
**(a) to avoid the sudden flow ...( not sure)
(b) to send the water at an angle..
(c) to avoid shock flow..
(d) Alll
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