HPCL Mechanical Question Paper 12 AUG 2021 || Shift 2

Hindustan Petroleum Corporation Limited (HPCL) is one of India’s leading integrated oil and gas companies, renowned for its excellence in refining, marketing, and distribution of petroleum products. Established in 1974, HPCL has grown to become a prominent player in the energy sector, serving as a pillar of India’s energy security and driving the nation’s progress.

With its headquarters located in Mumbai, Maharashtra, HPCL operates a vast network of refineries, terminals, depots, and retail outlets across the country. The company’s primary focus lies in the downstream segment of the petroleum industry, encompassing refining, marketing, and distribution of a wide range of petroleum products.

HPCL Recruitment 2021 MECHANICAL Vacancy Details– 120 Posts

HPCL Mechanical Exam 2021 Selection Process

The Exam pattern includes:

1. COMPUTER BASED TEST (85% weightage)
   Minimum qualifying marks in Domain section – 50% for all categories.
   Minimum qualifying Overall Marks (i.e. General Aptitude + Technical) Marks – 60% for UR/EWS & 54% for SC/ST/PwBD/OBCNC.
2. GROUP TASK (5% Weightage)
   Minimum Qualifying Marks – 40% for UR/EWS & 33.33% for SC/ST/ PwBD/OBCNC.
3. PERSONAL INTERVIEW (10% weightage)
   Minimum Qualifying Marks – 40% for UR/EWS & 33.33% for SC/ST/PwBD/OBCNC.
4. FINAL SCORING
   Minimum qualifying Marks – 60% for UR/EWS & 54% for SC/ ST/OBCNC/ PwBD in combined
   scores of Computer Based Test + Group Task+ Personal Interview

General Aptitude & Reasoning – 85 Marks
Mechanical based – 85 Marks
Total – 170 Marks 2Hr 30 min

HPCL MECHANICAL Cutoff 2021

Educational Qualification

A 4-year full-time regular engineering course from AICTE approved / UGC recognized University/Deemed University with a minimum of 60% marks for UR/OBCNC/EWS Candidates and 50% for SC/ST/PwBD candidates.

HPCL Recruitment 2021 Age Limit

25 years (Maximum age limit is relaxed by 5 years for SC & ST, 3 years for OBC-NC, 10 years for PwBD (UR), 13 years for PwBD (OBC-NC) and 15 years for PwBD (SC/ST) candidates.

HPCL Pay Scale

Salary Grade – E2, INR 50,000-1,60,000 per month Approx. – 15.17 Approx. Per annum

YOU CAN ALSO PRACTICE HPCL Mechanical Question Papers 12 AUG 2021 || Shift 1.

HPCL Mechanical Question Papers 12 AUG 2021 || Shift 2:-

1. For nonlinear elastic behavior materials, the tangent modulus is determined using a stress- strain  diagram. The tangent is drawn at a point of: 

A. curve where the modulus is required 

B. At breaking point 

C. Origin 

D. Horizontal portion of curve 

2. The air standard efficiency of an otto cycle is given by the expression ƞ_a = 1 – 1/(R_c)^n where R_c is the  compression ratio. The value of ‘n’ in this equation is: 

A. 1 

B. ϒ-1 

C. ϒ 

D. -1 

3. The whirling speed of a rotating shaft is the same as the frequency of the shaft in. 

A. Forced transverse vibration 

B. Natural transverse vibration 

C. Forced longitudinal vibration 

D. Natural longitudinal vibration 

4. Offset yield strength is an arbitrary approximation of a material’s elastic limit. Though it can vary  based on the material, the most common value of offset yield strength is: 

A. 0.0004% 

B. 2% 

C. 0.0002 % 

D. 0.2% 

5. The lattice structure of Titanium is 

A. Body centred 

B. Close packed hexagonal 

C. Face centred 

D. Cubic

6. In a graphical solution of solving Linear Programming problem to convert inequalities into equations, it  is essential to use which one of the following? 

A. Them to be equations 

B. Them to be artificial surplus variables and slack variables both 

C. Them to be slack variables 

D. Them to be artificial surplus variables 

7. In the thermodynamic relation Pv=nRT, the term ‘n is 

A. Number of moles 

B. Avogadro number 

C. universal gas constant 

D. a gas constant 

8. In the process of Cyaniding, the heated steel is immersed in a molten bath at a temperature of 

A. 500 to 800 °C 

B. 800 to 900 °C 

C. 200 to 400 °C 

D. 400 to 500 °C 

9. Transport of free electrons resulting in a transfer of heat from one part of a substance to another is  called: 

A. Radiation 

B. Conduction 

C. Natural Convection 

D. Forced Convection 

10. Which material is coated on pure tungsten electrode to enhance its current capacity in GTAW? 

A. Titanium 

B. Manganese 

C. Thorium

D. Titanium and Manganese both 

11. The sensitivity of forecast in simple moving average forecasting method, for the increase of the length  of average period, 

A. Remains constant 

B. had a predictable and adverse trend 

C. Decrease but with the lagging trend 

D. increases but with a lagging trend 

12. The coarse-grained structure of the steel can be eliminated considerably by the treatment 

A. Hardening 

B. Annealing 

C. Normalizing 

D. Martempering 

Correct answer – C 

13. The kinetic energy of a flywheel or rotating body having a moment of inertia (I) and angular  velocity(ω) is 

A. Iω

B. 0.5 I ω²

C. I ω²

D. 0.5I ω

14. Diamond has a crystalline structure like 

A. Covalent Solids 

B. Molecular Solids 

C. Metallic Solids 

D. lonic Solids 

15. In a tensile test, the slope of the “Load to extension curve is 360 kN/mm. The cross- section and a  gauge length of the specimen are 100 mm² and 50 mm, respectively. Then the Young’s Modulus of the  material is

A. 1800 kN/mm² 

B. 90 kN/mm² 

C. 18 kN/mm²

D. 180kN/mm_² 

16. Two bodies A and B are projected upwards such that the velocity of A is double the velocity of B.  Then, the ratio of heights to which body A and body B will rise is 

A. 1.6 

B. 8 

C. 4 

D. 2 

17. It is impossible for heat to flow from a body at a lower temperature to a body at a higher temperature  without the aid of external work. This statement is 

A. Kirchhoff’s statement 

B. Brayton’s statement 

C. Kelvin-Planck Statement 

D. Clausius statement 

18. For a flat surface, the shape factor with respect to itself in the radiative heat transfer is 

A. Zero 

B. Two 

C. Half 

D. One 

19. A thin cylindrical pressure vessel of 500 mm diameter and 10 mm thick is subjected to an internal  pressure of 2 MPa. The circumferential stress in the vessel is 

A. 50 MPa 

B. 12.5 MP 

C. 100MPa 

D. 26MPa 

20. The critical damping is said to occur when the frequency of damped vibration is 

A. Varying 

B. Decreasing 

C. Zero 

D. Increasing 

21. An oil of 9.81 litre has a 5 kg at room temperature. The specific weight of the oil is 

A. 509N/m^3 

B. 5 N/m^3 

C. 0.509 N/m^3 

D. 5 kN/m^3 

22. A reaction turbine runs at a speed N under the water head H. Then, the Unit Speed of the turbine is 

A. Nu = NH 

B. Nu = N/H 

C. Nu = N/H^2 

D. Nu = N/H^(1/2) 

23. The Transmissibility of a vibrating system, for the values of (ω/ωn) >√2, will be 

A. Equal to one 

B. Less than one 

C. Greater than one 

D. Zero 

24. In the Soderberg method, a failure stress line connects the endurance limit for reversal Loading with 

A. Yield stress 

B. Variable stress 

C. Shear stress 

D. Ultimate stress 

25. The distance measured perpendicular to the boundary, by which the mainstream is displaced on  account of the formation of the boundary layer, is 

A. Moment thickness 

B. Energy thickness 

C. Fluid thickness 

D. Displacement thickness 

26. Submerged arc welding, an automatic welding process uses AC current up to 

A. 2000 A 

B. 800 A 

C. 1000 A 

D. 600A 

27. A refrigeration system works on the principle of the Carnot cycle. It operates between the two  temperature (-23) and (+27) degree C. The coefficient of performance of the refrigeration system is: 

A. 0.2 

B. 5 

C. 50 

D. 2 

28. A reversible engine operates with source and sink temperatures of 127°C and 47°C The efficiency  of the engine is 

A. 37% 

B. 80% 

C. 20% 

D. 64% 

29. A bar is subjected to axial stress of ax. An oblique plane makes an angle 8 with the direction of stress  applied. The normal stress of on this plane is given by 

A. σ_ѳ = 2σ_xcosѲ 

B. σ_ѳ = σ_x(sin^2)Ѳ 

C. σ_ѳ = σ_xcosѲsinѲ 

D. σ_ѳ = σ_x(cos^2)Ѳ

30. A specimen made of ductile material subjected to tensile stress has maximum shear stress on a plane  inclined with an axis is 

A. 30 degree 

B. 60 degree 

C. 15 degree 

D. 45 degree 

31. The secondary unbalanced forces of reciprocating masses in the engine is  

A. Proportional to the length of connecting rod 

B. Inversely proportional to crank radius 

C. Inversely proportional to the ratio of the length of connecting rod to crank  

D. Proportional to the ratio of the length of connecting rod to crank radius 

32. The flame temperature of Oxygen-Acetylene mixture in gas welding is 

A. 2000 degree C 

B. 3200 degree C 

C. 2400 degree C 

D. 1700 degree C 

33. A square hole of side 5mm is cut out from a larger square plate of 10 mm side. The centre of the hole  is 6 mm above the bottom edge of the plate on the vertical midline. The centre of gravity of the plate is 

A. 4.666mm from bottom 

B. 2.8mm from bottom 

C. 4.666 mm from top  

D. 5mm from bottom 

34.A curved surface plate is immersed in the liquid. The Weight of liquid above the plate is V. and  Horizontal fluid pressure on the plate is H. Then fluid pressure acting this plate is 

A. V+H 

B. H

C. V 

D. √(V² + H²) 

35. The term (u-T.S) in deriving the maximum work done during the nonflow reversible process Is known  as  

A. Gibbs function 

B. Rankine function 

C. Helmholtz function 

D. Van-der function 

36. A wall of area 5 m² has a thermal conductivity of 10W/m degree C is transferring heat at a  temperature gradient of 30 degree C/m. Then heat flow across the wall is: 

A. 6.0 KW 

B. 4.5KW 

C. 1.5KW 

D. 1.6KW 

37. The efficiency of a jet of water impinging normally with a velocity (V) on series on vanes moving  with a velocity (v) is given by the relation 

A. 2(V-v)/V 

B. 2(V-v)/V^2 

C. (V-v)^2/2V 

D. (V-v)^2/V 

38. The content of Carbon in the hypoeutectoid Steels is 

A. More than 1.2% and less than 2.5% 

B. More than 0.8% and less than 1.2% 

C. Less than 0.8% 

D. More than 2.5% 

39. Two forces of 10 N and 40 N act vertically downward at endpoints of a horizontal rod of 120 mm  length. The location of the resultant force on the rod is 

A. 24 mm from a smaller force 

B. 96 mm from a smaller force 

C. 60 mm from a larger force 

D. 48 mm from a smaller force 

40. The body-centered cubic (BCC) has a coordination number of 8 and contains ______ atoms per unit  cell. 

A. 2 

B. 8 

C. 4 

D. 12 

41. According to Bernoulli’s equation, the total energy of a particle applies 

A. Compressible 

B. a shear flow 

C. a non-continuous stream 

D. Incompressible 

42. A brittle material will fail when the maximum tensile stress reaches a value of ultimate normal stress  subjected to simple tension. This is the theory of 

A. Tresca failure criterion 

B. Maximum normal stress thery 

C. Maximum distortion energy theory 

D. Mohr’s failure criterion 

43. In a unilateral system of tolerance, tolerance is allowed on which side? 

A. one side of the nominals 

B. Both sides of the actual size 

C. one side of the actual size 

D. no side of the nominal size

44. The loss of pressure head fluid flow is proportional to (velocity)n. Which of the following is the range  of the value of ‘w for the turbulent flow? 

A. 1.75 to 2.0 

B. 2.75 to 3.0 

C. 0.25 to 0.75 

D. 0.75 to 1 

45. A single-cylinder diesel engine has a compression ratio of 16. If the stroke volume during operation is  450 cc, then its clearance volume is 

A. 32.875 cc 

B. 28.125 cc 

C. 32cc 

D. 30cc 

46. The non-dimensional number (hL_c/K) is called as 

A. Grashoff number 

B. Fourier number 

C. Bot number 

D. Prandtl number 

47. The Reynold’s number, used for critical velocity for turbulent flow of fluids, is given by the relation 

A. Viscous force/mass Density 

B. Viscous force/Pressure head 

C. Inertia force/viscous force 

D. Pressure head/viscous force 

48. The aluminum alloy part for a Petrol engine carburetor is manufactured by 

A. Shell casting 

B. Sandcasting 

C. Centrifugal casting

D. Die casting 

49. In crippling load equation for a column of length L, the equivalent length for a case of both the ends  fixed is 

A. L_e=L 

B. L_e=L/4 

C. L_e=L/2 

D. L_e=2L 

50. The water in a glass tube wet the surface of the tube. This is due to the 

A. Adhesion between water is glass is less 

B. Density of glass is more than water 

C. Adhesion between watering more 

D. More cohesion of water molecules 

51. For a vibrating body, the maximum kinetic energy at the mean position is equal to the maximum  potential energy (or strain energy) at the extreme position. This statement is the 

A. Energy method 

B. Ritz method 

C. Rayleigh’s method 

D. Equilibrium Method 

52. A flywheel is having a mass moment of inertia of I work with angular speeds ω₁ and ω₂. The  maximum fluctuation of energy in the flywheel is equal to: 

A. I ω(ω₁– ω₂) 

B. ½ I ω^2 

C. ½ I ω(ω₁– ω₂) 

D. I ω^2 

53. The parameters assumed in a Linear programming model are treated as 

A. Equations 

B. Functions

C. Variables 

D. Constraint 

54. An impulse water turbine delivers 245.5 kW under the head of 20 m. The quantity of water is supplied  to the turbine is 2.5 m3/s. then the efficiency of the turbine is 

A. 25% 

B. 62% 

C. 5% 

D. 50% 

55. A Fluid flowing in a pipe and the velocities of liquid particles at all sections are the same. The type of  flow is 

A. Streamline flow 

B. Uniform flow 

C. Compressible flow 

D. Steady flow 

56. The gear train in which the axes of the shafts, over which the gears are mounted, move relative to a  fixed axis is called the ___________ gear train. 

A. Epicyclic 

B. compound 

C. simple 

D. none of the other options 

57. According to Stefan-Boltzmann Law, the emissive power is directly proportional to the fourth power  of its absolute temperature. This applies to 

A. Green body 

B. White body 

C. Black body 

D. Gray body 

58. The shear stress induced at the centre of a solid shaft, when subjected to a torque, is

A. Maximum 

B. Average 

C. Less than zero 

D. Zero 

59. The Thermal Arrest a part of the cooling curve for a casting known as “Thermal Arrest” is 

A. Blocking of cooling of metal by the riser  

B. Blocking of co cooling of metal by the sand mould 

C. Solidification of metal using latent heat of fusion 

D. Immediate cooling of sand mould 

60. The athematic mean temperature difference for counter-flow heat exchanger when hot Water side temperatures are 90°C and 40°C, while cold side temperatures are 20and 40°C 

A. 25°C 

B. 70°C 

C. 35°C 

D. 55°C 

61. The water jet comes out of an orifice of a tank, has a minimum cross-section at a point. It is occurring  at 

A. Vena-contracta 

B. Exit of the orifice 

C. Mid of the office 

D. Entrance of the office 

62 A cantilever beam of length L is loaded with a force F downward at its free end x-10. The shear force  and bending Moment at the mid of the beam is 

A. F and -FL/2 

B. -F and FL/4 

C. -F and-FL/2 

D. F and-2FL 

63. A pipe 100 mm in diameter and 981m long delivers water at a velocity of 1.0 m/s. The loss of head,  when the coefficient of friction in pipe f=0.0008, is 

A. 6.4 

B. 3.2 

C. 12.8 

D. 1.6 

64. A rigid link AB is revolving around point A. The direction of the relative velocity of end B with  respect to another end A is 

A. along with AB 

B. perpendicular to All 

C. inclined to AB 

D. Parallel to AB 

65. The practical unit of refrigeration One Ton is the amount of heat removed from one ton of Water 00C  to become ice in 

A. 12 hours 

B. 1 hour 

C. 8 hours 

D. 24 hours 

66. In the case of neutral flame, the oxygen to acetylene ratio is 

A. 1:1 

B. 0.6:1 

C. 3:1 

D. 2:1 

67. The characteristic curve of unit speed Vs discharge for a reaction turbine shows, as The unit  speed increases, the water discharge 

A. Decreases linearly 

B. Increase linearly

C. Increase parabolically 

D. Decrease parabolically 

68. The concept of Thermodynamic equilibrium is discussed in 

A. Second Law of Thermodynamics  

B. First Law of Thermodynamics 

C. Third Law of Thermodynamics 

D. Thermodynamic Zeroth Law 

69. The two non-intersecting and non-parallel or non-coplanar shafts are connected by gears 

A. Helical gears 

B. Herringbone gears 

C. Bevel gears 

D. Spiral gears 

70. The critical value of (U_x/v) for the linear boundary layer is 

A. More than 5 x 10^5 

B. Equal to 6 x 10^5 

C. Less than 5 x 10^5 

D. More than 6 x 10^5 

71. A shaft 20 mm in diameter is supported in a bearing, carry a radial load of 2.0 kN. Assuming an  allowable bearing pressure of 8 N/mm2, the length of the bearing is 

A. 0.25mm 

B. 5πmm 

C. 25mm 

D. 12.5mm 

72. A specimen has a modulus of rigidity of 48 MPa and Young’s Modulus of 120 MPa. The Poisson’s  ratio of the material is

A. 1/2.5 

B. 1/2 

C. 1/3 

D. 1/4 

73. A rectangular block is floating in a liquid. The distance of the meta centre from the point of buoyance  is equal to the ratio of 

A. Area of plan to the volume of liquid displaced 

B. Volume of liquid displaced to Moment of inertia of plan 

C. Cross-section of the block to the volume of liquid displaced  

D. Moment of inertia of plan to the volume of liquid displaced 

74. The selection of a type of turbine depends more scientifically with  

A. Unit speed 

B. Specific head 

C. Unit head 

D. Specific speed 

75. The power of a governor is the work done at the  

A. The fulcrum of arm for a given change of speed 

B. mass for a given change of speed 

C. arm for a given percentage change of speed 

D. sleeve for a given percentage change of speed 

76. A simply supported beam of length Lis loaded centrally with force -F. The maximum bending  Moment at mid of the beam is 

A. FL^2/2 

B. -FL/4 

C. FL/4 

D. FL/2 

77. A wooden cube of side 0.2m is floating in the water. The density of wood is 600kg/m^3. Then the  volume of water displaced by the wooden block is: 

A. 4.8 Ltr 

B. 2.4 ltr 

C. 0.6 ltr 

D. 1.2 ltr 

78. A gun of mass 10 kg fires a bullet of mass 20 gram with a velocity of 200 m/s. The recoil velocity of  the gun is 

A. 0.4 m/s 

B. 20m/s 

C. 400m/s 

D. 0.1m/s 

79. A sine bar of 100 mm is used to measure an angle of 30 degrees. The height of the roller above the  other is 

A. 1.5 mm 

B. 12.5mm 

C. 25mm 

D. 50mm 

80. A system in which the exchanges neither energy nor matter with any other system is called 

A. Open System 

B. Isolated System 

C. Transient System 

D. Adiabatic system 

81. The property of material able to withstand both plastic and elastic deformations is called as 

A. Toughness 

B. Malleability 

C. Resilience

D. Hardness 

82. Two forces of 10 N and 20 N act simultaneously at a point, and the angle 60. The resultant of  these two forces is 

A. √500 N 

B. √700 N 

C. √900 N 

D. √1100 N 

83. A method in which the study of the flow pattern of all the particles simultaneously at one section is 

A. Eulerian method 

B. Clayton method 

C. Newtonian method 

D. Lagrangian method 

84. According to the law of collision of elastic bodies, the value of Coefficient of Restitution € for the two  perfect elastic bodies is: 

A. e=1 

B. e=2 

C. e=4 

D. e=0 

85. A flywheel accelerates uniformly from rest to angular velocity of 40 rad/s in 2.5 seconds. What is its  angular acceleration? 

A. 6.4 rad/s 

B. 100 rad/s² 

C. 0.0625 rad/s2 

D. 16 rad/s²