NTPC Mechanical Exam Question Paper

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NTPC Mechanical Exam Question Paper
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* An ice block submerged in the water, if the ice melts level of water (increase, decrease, remains same, none)

* Simply supported beam with w point load at the middle, max. bending moment? (wl/4)

* Simply supported beam with UDL ,max.deflection (wl4/384EI)

* Cantilevel beam point load at tip,max.bending momemt comes at (end)

* When bearing life L10 represents (bearings 10%survive,bearings 10% fails, none )

* For welding high carbon steels which type of flame is used (oxidizing, carburizing, neutral, none)

* Arrange the following cutting tools in decreasing order of machining hardness…Ceramics

* When P1 and P2 are the loads acting on bearings with life L1 and L2 then L1/L2=? L1/L2={P2/P1}10/3

* Product simplification does not mean? (Product characterization)

* Which of the following process has the most scope in manufacturing? CAD/CAM, CAM, CIM, All the above.

* Concurrent engineering means? (Manufacturing, designing, both, none)

* Which manufacturing process yields higher output and increases worker productivity- (process layout, line+process, functional layout)

* 18-4-1 represents-, Tungsten-Cr-Vn

* For which material is negative allowance rovided-(Graphite,steel,bronze,cast iron)

* What is the recrystallisation temperature of tin- (60,300,1000,none)

* What is the purpose of borax in soldering-

* Top gates are provided in which type of casting-(Shallow casting,simple,complex,none)

* Which statement is true regarding simple gear trains-(i/p and o/p shafts r fixed, each shaft has 2 gears, i/p & o/p shafts r moving)

* What is the purpose of normalizing- (Refining of grain structure)

* As the grain size is decreased-(Hardness increases,corrosion resistance decreases,both)

* Isothermal gas is filled in a vessel at a pressure P and temperature T then considering the compressible forces as the height increases pressure ??(linearly increases linearly decreases exponentially increase )

* A bottle is filled with water and air and is tied to a string and is rotated in horizontal direction. Then in which direction will air bubble travel?
(bottom,neck,uniformly spread)

* A empty bottle(in vaccum) filled with a gas at temp T and press P when the pressure of bottle reaches P temperature of the gas is _? (T,T/K,TK)

* Bearing somerfield number _ with load on bearing? (increases,decreases,no change)

* Critical radius for a sphere is-(2k/h)

* Critical radius exist for_ (spherical,cylindrical,both,slab)

* Convectional resistance/internal resistance is called (biot number)

* Nusselt no. is? (hl/k)

* EOQ=?

* Which statement is true regarding critical path method? (i only one critical path exists for a network, more than one with same duration,)

* Shipment cost,inspection cost,storage cost comes under_ (carrying cost ,holding cost,)

* Ischronous governers sensitivity is- (zero,infinite)

* Self energized brakes are-(friction moment acts in the direction of application of force,opposite to the direction of force, does not need a force to act ,)

* The ratio of heat capacities for evaporator and condenser is_ (Zero,infinity)

* When steam and air mixture with partial pressure 0.06 and 0.07 enters a condenser what is the condenser pressure? (0.06,0.07,0.53,0.03)

* In pulverized burning of coal heat transfer from boiler to water occurs through_( predominant radiation, convection, conduction, conduction+convection)

* Rankine cycle efficiency for same parameters increases mostly with_(reheat, regeneration, super heating )

* Ericson cycle with all reversible processes assume_(carnot cycle,stirling,brayton

* Air delivery tank at outlet of reciprocating compressor is provided for_ (provide constant pressure, avoid cavitation, )

* High speed centrifugal pump has _? (vanes faces in forward direction side,backward,radial vanes)

* Thermal efficiency in decreasing order_? (Otto cycle>dual cycle>diesel cycle)

* When a 1000 K body comes in contact with atmosphere at 300K a loss of 9000 KJ heat is transferred. The net available energy transferred is_

* When entropy of a system increases_? (unavailable energy increases )

* Rolling is a process widely used for_?

* Tool nomenclature_?

* In francis turbine movement of steam?

* For low power consumption _? (rake angle should be increased / decreased, nose angle increased/ decreased)

* Continuous chips occur in_? (High speeds,low speeds,both,none)

* Primary forces in a reciprocating engine_? (fully balanced, partially balanced, completely unbalanced, none)

* In proximate analysis pyrogallol is used for analysis of which element_? (nitrogen,oxygen)

* Sulphur content in fuel greatly affects_? (corrosion)

* Heat transfer through radiation can be increased by_? (decreasing emissivity and increases temperature of hot body)

* Which theory of failure clearly explains the failure in case of ductile material? (Maximun shear stress theory or Guests or trescas theory)

When a material is subjected to continuous cycles which limit is being verified? (Endurance limit)

Where is stress concentration maximum? (notches, stress reducing through cuts)

* Power transmitted through a belt drive_? P(T2-T1)

* According to Eulers theory crippling or buckling load is ____ (Wcr = Cπ2EI/l2)

* During sensible heating, specific humidity_? (remains constant)

* COP of a refrigerator is _? (greater than 1 )

* The maximum temperature in a refrigeration cycle is_? (less than/greater than/equal to critical temperature)

* The pressure at the throat of the nozzle_? (maximum,min)

* For a statically determinate set of forces for equilibrium_? (∑ f(X), f(Y), f(Z)=0,∑M=0)

* For a statically determinate set of forces- (there r as many equations as the no. of unknowns)

* 1-2-3 analysis is used for_? (1.break even analysis, ??)

* A problem on mean time of service something like a salesman has a rating of 120. considering 10% allowance time calculate the time required to serve 120?

* A problem n determining time in a queue?

* Energy equation for a laminar flow is _? (Uniform and steady ,non uniform and unsteady)

* Undercuts in welding occurs due to_? (low welding current, high welding current)

* Work holding equipment in shearing?

* At the centre of a nozzle _? (Mach no<1 >=1;=1)