How to get NTPC Placement Papers

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1. An ice block submerged in the water, if the ice melts level of water_? (increase, decrease, remains same, none)

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

3. Simply supported beam with UDL, max.deflection_? (wl4/384EI)

4. Cantilevel beam point load at tip, max.bending momemt comes at_? (end)

5. When bearing life L10 represents_? (bearings 10%survive, bearings 10% fails, none )

6. For welding high carbon steels which type of flame is used_? (oxidizing, carburizing, neutral, none)

7. Arrange the following cutting tools in decreasing order of machining hardness.. Ceramics

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

9. Product simplification does not mean_? (Product characterization)

10. Which of the following process has the most scope in manufacturing_? (CAD/CAM, CAM, CIM, All the above.)

11. Concurrent engineering means_? (Manufacturing, designing, both, none)

12. Which manufacturing process yields higher output and increases worker productivity_? (process layout, line+process, functional layout)

13. 18-4-1 represents_? Tungsten-Cr-Vn

14. For which material is negative allowance provided_? (Graphite, steel, bronze, cast iron)

15. What is the recrystallisation temperature of tin_? (60,300,1000,none)

16. What is the purpose of borax in soldering_?

17. Top gates are provided in which type of casting_? (Shallow casting, simple, complex, none)

18. 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)

19. What is the purpose of normalizing_? (Refining of grain structure)

20. As the grain size is decreased_? (Hardness increases, corrosion resistance decreases, both)

21. 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)

22. 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)

23. An 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)

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

25. Critical radius for a sphere is_? (2k/h)

26. Critical radius exist for_? (spherical, cylindrical, both, slab)

27. Convectional resistance/internal resistance is called_? (biot number)

28. Nusselt no. is_? (hl/k)

29. EOQ=?

30. Which statement is true regarding critical path method_? (only one critical path exists for a network, more than one with same duration)

31. Shipment cost,inspection cost, storage cost comes under_? (carrying cost, holding cost,)

32. Ischronous governers sensitivity is_? (zero, infinite)

33. 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)

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

35. 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)

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

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

38. Ericson cycle with all reversible processes assume_? (carnot cycle, stirling, brayton)

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

40. High speed centrifugal pump has_?
(vanes faces in forward direction side, backward, radial vanes)

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

42. 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_?

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

44. Rolling is a process widely used for_?
(I section, tubes)

45. Tool nomenclature_?

46. In francis turbine movement of steam_?

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

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

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

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

50. Sulphur content in fuel greatly affects_? (corrosion)

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

52. Which theory of failure clearly explains the failure in case of ductile material_? (Maximum shear stress theory or Guests or trescas theory)

53. When a material is subjected to continuous cycles which limit is being verified_? (Endurance limit)

54. where is stress concentration maximum_? (notches, stress reducing throughcuts)

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

56. According to Eulers theory crippling or buckling load is_? (Wcr = Cp2EI/l2)

57. During sensible heating, specific humidity_? (remains constant)

58. COP of a refrigerator is_? (greater than 1 )

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

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

61. for a statically determinate set of forces for equilibrium_? (? f(X),f(Y),f(Z)=0,?M=0)

62. For a statically determinate set of forces_? (there r as many equations as the no. of unknowns)

63. 1-2-3 analysis is used for_? (1.break even analysis, ??)

64. 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_?

65. A problem n determining time in a queue??

66. Energy equation for a laminar flow is_? (Uniform and steady, non uniform and unsteady)

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

68. Work holding equipment in shearing_?

69. At the centre of a nozzle_? (Mach no<1 >=1;=1)

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Answered By StudyChaCha Member

Ok, as you want the placement paper of NTPC so here I am providing you.

NTPC Placement Papers

1. What is causal system?
2. Shunt reactor is used in EHV transmission line for
3. 20w, 40W, & 200w lamps are connected to three phases if neutral wire breaks then which lamp will fuse first? 1) 20 2)40 3)200 three lamps will fuse together.
4. Synchronous machine can be operated at both lagging and leading power factor
5 What does synchronous speed mean?
6. Frequency of emf generated per rotation of rotor is equal to….
7. DC machine having wave winding is wounded as lap winding what will be the effect on emf generated

8 Which is remain unchanged in transformer action?
9. In transformer windings are connected………….?

10. In general how transformer is rated?

11. What is given on the name plate of motor? 1) KW 2) KVA 3) output shaft power

12. Short circuit test of transformer gives what?

13. Transformer core are laminated for what purpose?

14. What is supply voltage for heavy industry .1) 33KV 2) 11KV 3) 132 KV 4) 66KV

15. Basic structure SCR as a two transistor i.e. how they are connected?

16. What is Triac?

17. System admittance is (G+jB) what is reactive power absorbed if the voltage is V KV? (1) V (square)*B (2) V (square)*g ….

18. In series R-L circuit what is phase difference between the voltage drop across R and L?

19. Power factor is cosine (delta ) delta is the angle between 1) phase voltage phase current 2)

Line voltage lone current 3) phase voltage line current 4) line voltage phase current.

20. Laplace of exp (-at)?

21. For series R-L-C circuit the load will be capacitive if the frequency is 1) greater than the resonant frequency 2) less than the resonant frequency 3)….

22. In Wien’s bridge which circuit elements determine the frequency range?

23. What is the output if two booster having duty cycle K and (K-1) are connected in series?

24. If a DC shunt motor is loaded from unloaded condition what will be effect of on terminal voltage?

25. A second wire system having one pole one right half of the s-plane. When the system will be stable?

26. A system having repetitive pole what will be effect on the gain at the cross over frequency?

27. Hollow conductor is used to reduce corona loss how does it reduce the loss?

28. In DC machine how voltage is related to flux?

29. Nature of current and voltage in the armature and at the terminal in DC machine.

30. Motor acts on the principle of …………..rule

31. Which instrument measure both ac and dc?

32. How the rotation of induction motor is reversed?

33. If 3-phaseof a 3- phase balance load are reversed what will be the effect on the line current?

34. If the rating of VAR absorber is 50MVAR at 400KV. What will the VAR absorbed by the absorber at 300KV?

35. In regenerative breaking of DC series motor what is done?

36. Definitions of Fourier transform?

37. Laplace of f(t) is F(S) what is Laplace of f(t+T) .

38. Z-transform of sampled function x(n) for n>0.

39. Laplace transform of impulse function.

40. Z-transform of unity.

41. How many slip rings are there in 3phase synchronous motor?

42. How the speed of synchronous motor is controlled?

43. Speed control of induction motor?

44. When power supply is supplied to heater coil it glows while simple wire does not glow. Why?

45. A synchronous generator having inertia constant 4 and having rating of 100MVA. What will be energy stored by the machine?

46. A transformer having ratio 20:1. The secondary load is 0.6 ohm and the voltage across it is 6 V what will be the primary current?

47. A RC circuit having r=0.8ohm, c=2.5micofarad what will be the time constant?

48. Find load impedance if c=0.1 micro farad?

49. Two capacitors connected in series the equivalent capacitance is 0.03uf and when connected in parallel the equivalent capacitance is 0.16uf find out the ratio of the two capacitance?

50. An L-c circuit having frequency 1/sqrt (LC) what will the equivalent impedance?

51. An inverting op-am having input with resistance in series and a capacitance in feedback operates as a……………….?

52. A current having fundamental and third harmonics what will be the rms value of the current?

53. Peak to peak value of voltage if rms voltage is 100V.

54. Rms voltage.

55. What is the approx efficiency of nuclear power plant?

56. What is the average current of a single phase full wave rectifier firing at angle alpha?

57. What is the function of freewheeling diode?

58. When SCR stops conduction? (holding current)

59. For measuring current why shunt resistance is used?

60. For economic operation of plant what is the condition?(taking into account the penalty factor)

61. Incremental fuel cost of two plants is given and a load is given. Find out the load sharing for economic operation of the plant?

62. A two port network is represented by ABCD parameters. What will be condition for the two port network to be symmetrical?

63. Size of the conductor is determined by ……………….

64. Which Surface is suitable for grounding?

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Answered By StudyChaCha Member