HPCL Mechanical Question Paper 12 AUG 2021 || Shift 1

Hindustan Petroleum Corporation Limited (HPCL) is one of India’s leading integrated oil and gas companies, renowned for its commitment to 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.

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

HPCL Mechanical Question Papers 12 AUG 2021 || Shift 1:-

Q.1 A vibrating system consists of a mass of 200kg, spring stiffness of 80N/mm. The natural frequency of  vibration of the system is: 

(A) 5.0 rad/s 

(B) 2.5 rad/s 

(C) 3.20 rad/s  

(D) 4.40 rad/s 

Q.2 The unbalanced vertical force, which tends to slide one portion of the beam upward or downward,  is called as: 

(A) Body force 

(B) Shear force 

(C) Reactive force 

(D) Bending force 

Q.3 In the MIG welding process, a lot of spattering occurs when the shielding gas used is: 

(A) Mixture of Argon 

(B) Argon 

(C) Helium 

(D) Carbon Dioxide 

Q.4 Long cast-iron pipes of uniform thickness are manufactured by: 

(A) Green sand-casting method 

(B) Lost wax method 

(C) Die casting method 

(D) Centrifugal casting method 

Q.5 In a reciprocating engine, the primary direct crank makes an angle Ѳ with the line of stroke, Then  the secondary direct crank will make an angle of: 

(A) Ѳ/2 

(B) Ѳ/4 

(C) 2Ѳ

(D) Ѳ 

Q.6 The performance of a steam cycle in a power plant is compared with a standard process of: 

(A) Rankine cycle 

(B) Carnot cycle 

(C) Air standard cycle 

(D) Constant pressure cycle 

Q.7 At constant pressure, heat energy of 1800 J supplied to 2 kg of fluid, which cause a rise in  temperature of 15-degree C. The average specific heat of the fluid is: 

(A) Cp=30 J/kg°C 

(B) Cp=60 J/kg°C 

(C) Cv=60 J/kg°C 

(D) Cv=30 J/kg°C 

Q.8. A Pelton wheel with a mean diameter D has the jet diameter d. The number of buckets required for  this impulse turbine is: 

(A) (D/2d) + 10 

(B) (2D/d) + 15 

(C) (D/2d) + 15 

(D) (2D/d) + 10 

Q.9 The total weight of a body is an example for a: 

(A) Distributed Area force 

(B) Point force 

(C) Volume force 

(D) Traction force 

Q.10 Generally the bill of material does not consist of: 

(A) Part number 

(B) Price of the part 

(C) Name of the part 

(D) Specification of part 

Q.11 The fundamental property of material able to resist abrasion is called as: 

(A) Hardness 

(B) Toughness 

(C) Malleability 

(D) Resilience 

Q.12 In TIG welding, the welding zone is shielded by an atmosphere of: 

(A) Hydrogen gas 

(B) Carbon dioxide gas 

(C) Argon gas 

(D) Oxygen gas 

Q.13 An ideal reciprocating air compressor demands less work to run if the compression follows: 

(A) Reversible adiabatic process 

(B) Adiabatic process 

(C) Isothermal process 

(D) Non-isothermal process 

Q.14 The power transmitted through the pipe is maximum when the head loss due to friction in the pipe  is: 

(A) 1/3 of the total supply head 

(B) 2/3 of the total supply head 

(C) ½ of the total supply head 

(D) ¼ of the total supply head

Q.15 The hardness of the steel can be reduced considerably by the treatment of: 

(A) Normalizing 

(B) Hardening 

(C) Normalizing and hardening both 

(D) Annealing 

Q.16 In the Nitriding process for steels to harden the surface, the gas used is: 

(A) Carbon dioxide 

(B) Ammonia 

(C) Hydrogen 

(D) Oxygen 

Q.17 The concept of internal energy is discussed in: 

(A) Second law of Thermodynamics 

(B) Thermodynamic Zeroth law 

(C) Third law of Thermodynamics 

(D) First law of Thermodynamics 

Q.18 The vehicle of mass 1200kg is moving at a speed of 72 km/h. The amount of energy to be absorbed  by the brakes to stop the vehicle is: 

(A) 1440 KJ 

(B) 720 KJ 

(C) 480 KJ 

(D) 240 KJ 

Q.19 A simply supported beam of span 4m and I =12*10⁶ mm⁴ is subjected to a central load of 9KN.  The deflection of the beam when E = 200 GPa, is: 

(A) 15mm

(B) 0.037mm 

(C) 3.5mm 

(D) 0.074mm 

Q.20 The absolute temperature (K) scale needs only one fixpoint, which is the: 

(A) Normal body temperature 

(B) Boiling point water 

(C) The melting point of ice 

(D) The triple point of water 

Q.21 Transfer of heat from one part of a substance to another by lattice vibration is called: 

(A) Radiation 

(B) Conduction 

(C) Natural Convection 

(D) Forced Convection 

Q.22 The strain energy stored in a body due to the external loads is known as: 

(A) Proof Resilience 

(B) Resilience 

(C) Modulus of Resilience 

(D) Resonance 

Q.23 The moment of inertia about XX axis for a hollow rectangular section with external dimensions  breadth me, depth 8 mm and internal dimensions breadth 3 mm and depth 4mm respectively, is 

(A) 240 mm⁴

(B) 36 mm⁴

(C) 28 mm⁴

(D) 272 mm⁴

Q.24 The algebraic difference between the maximum limit and the basic size is called: 

(A) Fundamental deviation 

(B) Upper deviation 

(C) Actual deviation 

(D) Lower deviation 

Q.25 The allowance for the liquid shrinkage is considered in designing casting patterns. The reduction in  the volume of cast metal occurs during: 

(A) Cooling of liquid to solid state 

(B) Due to ramming 

(C) Mould cooling 

(D) Rise in volume of raiser 

Q. 26 A frame is made with four joints and five members. This frame is: 

(A) Redundant frame 

(B) Perfect frame 

(C) Imperfect frame 

(D) Deficient frame 

Q.27 A mirror image for a 2D reflection is generated relative to an axis of reflection by: 

(A) 360 degree 

(B) 90 degree 

(C) 270 degree 

(D) 180 degree 

Q.28 A number of forces are acting simultaneously on a particle. The resultant of these forces will have  the same effect as produced by all the forces. This principle is known as: 

(A) Transmissibility of forces 

(B) Resolution of forces 

(C) Physical independence of forces 

(D) Equilibrium of forces

Q.29 A rectangular steel of 100x25x20mm has strain in x, y and z directions, 0.0066, 90025 and 0002  respectively. The change in volume due to these strains is: 

(A) 366.6 mm³ 

(B) 625 mm³ 

(C) 550 mm³ 

(D) 183.3 mm³ 

Q.30 CNC machine operator can set the zero point at any position on the machine table. This feature is  called: 

(A) Machine zero 

(B) Fixed zero 

(C) Fixed origin 

(D) Floating zero 

Q.31 The lattice structure of a ferrite iron at room temperature is: 

(A) Close packed hexagonal 

(B) Cubic 

(C) Face centered 

(D) Body centered 

Q.32 A vernier caller has main scale with 1 division for 1 cm and vernier scale has 10 divisions for. The  least count of the caliper is: 

(A) 0.2mm 

(B) 0.02mm 

(C) 0.1mm 

(D) 0.01mm 

Q.33 In a simple Lever of the third order, the position of effort, load and fulcrum is:

(A) The load in between the fulcrum and the effort on the same side of the fulcrum

(B) The fulcrum is in between the effort and the load 

(C) The effect and the load are equidistance to the fulcrum on either side 

(D) The effort is in between the fulcrum and the load on the same side of the fulcrum

Q.34 For the Taylor tool life equation, VTⁿ=C, the value of n for ceramic tool is: 

(A) 0.40 to 0.60 

(B) 0.20 to 0.25 

(C) 0.25 to 0.40 

0.1 to 0.2 

Q.35 The water is flowing through a pipe with a mean velocity of 2m/s. The approximate Kinetic head of  water flow is: 

(A) 0.4m 

(B) 2.0m 

(C) 0.2m 

(D) 1.0m 

Q.36 The open-circuit voltage range for an AC electric arc welding is: 

(A) 220-440V 

(B) 100-210V 

(C) 210-440V 

(D) 50-90V 

Q.37 A casting of volume V and the surface area is cooled in an open-air naturally. The time required for  solidification of casting is: 

(A) Directly proportional to V/A 

(B) Directly proportional to (V/A)² 

(C) Inversely proportional to V/A 

(D) Inversely proportional to (V/A)² 

Q.38 In a diesel cycle, the heat is supplied during compression from the external source at: 

(A) Constant pressure 

(B) Adiabatic process 

(C) Isentropic process 

(D) Constant volume 

Q.39 A balloon is floating in the air and is in equilibrium. The relationship between the centre of gravity  and the Centre of buoyancy: 

(A) The centre of buoyancy and the centre gravity at different points on the same horizontal plane

(B) The centre of gravity is above the centre of buoyancy 

(C) The centre of gravity and the centre of buoyancy are at the same point 

(D) The centre of gravity is below the centre of buoyancy 

Q.40 A single plate disc clutch is used to transmit torque with the axial load W. The mean radius of the  surface of friction material is R, and the coefficient of friction for the clutch material is µ. The frictional  torque transmitted for a case of uniform axial wear is: 

(A) T = 2(µWR) 

(B) T = π(µWR) 

(C) T = µWR 

(D) T = ½ (µWR) 

Q.41 When a tensile specimen loaded beyond the yield point, and then the load is released. The elastic  strain recovery is indicated on the stress-strain curve as a line: 

(A) Along the original elastic curve 

(B) Along Y-axis, origin to yield stress 

(C) Along X-axis, vertical line from the point of release to return point 

(D) Tangent to the curve at the yield point 

Q.42 A wheel accelerates uniformly from a velocity of 10rad/s to 60rad/s in 20 seconds.

(A) 2.5 rad/s^2 

(B) 100 rad/s^2 

(C) 3.5 rad/s^2 

(D) 5.0 rad/s^2 

Q.43 The “etch factor” in the chemical machining process is given by the ratio: 

(A) Tool wear/workpiece wear 

(B) Depth of cut/undercut 

(C) Undercut/depth of cut 

(D) Workpiece wear/tool wear 

Q.44 A shaft is subjected to a bending moment of 30 N.mm and a twisting moment of 40 Nmm. The  equivalent twisting moment of this shaft is: 

(A) 140 Nmm 

(B) 50 Nmm 

(C) 10 Nmm 

(D) 70 Nmm 

Q.45 The approximate content of carbon in the Eutectoid steel is: 

(A) 0.4% 

(B) 0.8% 

(C) 1.2% 

(D) 0.25% 

Q.46 The smallest circle that can be drawn from the centre of the cam and tangent to the pitch curve of  a cam with a roller follower is: 

(A) Pressure circle 

(B) Pitch circle 

(C) Base circle 

(D) Prime circle 

Q.47 The coefficient o contraction C_c for an orifice can be determined using other coefficients; discharge  and velocity C_v by the relation: 

(A) Cc = Cd/Cv 

(B) Cc = Cd.Cv 

(C) Cc = Cd+Cv 

(D) Cc = Cd-Cv 

Q.48 In the metal forming process, the value of stress required for continuous material deformation is  known as: 

(A) Ultimate stress 

(B) Flow stress 

(C) True stress 

(D) Proof stress 

Q.49 A compressive load of 2.4KN acts on a circular bar of 200mm² area and 20mm hih. It experience  a compression of 0.15mm. Then, the Young’s Modulus of the material is: 

(A) 3200 MPa 

(B) 120 MPa 

(C) 1600 MPa 

(D) 1500 MPa 

Q.50 The term (h-T.S.) in deriving the maximum work done for a steady flow system is: 

(A) Van-der function 

(B) Rankine function 

(C) Helmholtz function 

(D) Gibbs function 

Q.51 Control charts for the attribute are concerned with: 

(A) Checking if the variable is out of control

(B) The actual measurement of the parameter, comparing with a standard 

(C) Qualitative checking of defects 

(D) Direct measurement of the variable for control 

Q.52 In under damped vibrating system, if x1 and x2 are the successive values of he amplitude on the  same side of the mean position, then the logarithmic decrement is equal to: 

(A) Log (x2+x1) 

(B) Log (x2/x1) 

(C) Log (x2-x1) 

(D) Log (x1/x2) 

Q.53 Breaking jets are used in turbines to: 

(A) To bring the turbine to rest 

(B) Reduce the speed of turbine while running 

(C) To keep the speed of turbine constant 

(D) Used to regulate the speed according to load 

Q.54 Two forces of equal magnitude ‘F’ acts on a particle, and the angle between these forces is Ѳ. Then  the resultant of these forces is given by: 

(A) 2F Sin(Ѳ/2) 

(B) 2F Cos(Ѳ/2) 

(C) F Cos^2(Ѳ/2) 

(D) F Sin^2(Ѳ/2) 

Q.55 A body which can retain its shape and size, even it is subjected to external forces, is called: 

(A) Elastic body 

(B) Solid body 

(C) Flexible body 

(D) Rigid body 

Q.56 The true stress strain relations deformation at which necking begins may be approximated. The value n for steel is σ_T= Kε_τ ⁿ

(A) 0.21 

(B) 0.16 

(C) 0.44 

(D) 0.12 

Q.57 A stone is dropped from the top of a building, which is 8m high. The final velocity of the  stone when it hit the ground is: 

(A) 1.2m/s 

(B) 4√g m/s 

(C) 2√g m/s 

(D) 4.4m/s 

Q.58 The perpetual motion machine of the first kind is impossible. This statement is the corollary of: 

(A) Second law of thermodynamics 

(B) Thermodynamics zeroth law 

(C) Third law of thermodynamics 

(D) First law of thermodynamics 

Q.59 The ratio of the relative lateral strain (normal to the applied load) to the relative axial strain (in the  direction of applied load) is called the: 

(A) Einstein’s ratio 

(B) Young’s ratio 

(C) Pareto’s ratio 

(D) Poisson’s ratio 

Q.60 Water is flowing through a square pipe 100mm side with an average velocity of 10m/s. The rate of  flow of water is: 

(A) 1000ltr/s

(B) 0.1m³/s 

(C) 1000m³/s 

(D) 10ltr/s 

Q.61 A dual cycle is one in which the heat is supplied at: 

(A) Constant volume and constant pressure compression 

(B) Constant pressure and isentropic compression 

(C) Isentropic and adiabatic compression 

(D) Constant volume and isentropic compression 

Q.62 Which of the following is the usual composition of the soft solder used in soldering? 

(A) Lead 80% and tin 20% 

(B) Lead 63% and tin 37% 

(C) Lead 90% and tin 10% 

(D) Lead 37% and tin 63% 

Q.63 In a flywheel, the maximum and minimum speeds in a cycle are 180 and 120rpm, respectively.  Then, the coefficient of fluctuation of the speed is: 

(A) 0.6 

(B) 0.8 

(C) 0.4 

(D) 0.9 

Q.64 An impulse water turbine works under the head of 40m, and water is supplied to the turbine is  2.5m³/s. Then the power available at jet is: 

(A) 100KW 

(B) 490.5KW 

(C) 50KW 

(D) 981KW 

Q.65 According to the law of collision of elastic bodies, the value of coefficient of restitution (e) for the  two inelastic bodies is: 

(A) e = ꚙ 

(B) e = 2 

(C) e = 1 

(D) e = 0 

Q.66 A refrigerator absorbs the heat of 27KJ/s at minimum temperature. The work required to run the  refrigerator if the coefficient of performance is 3. 

(A) 9KJ/S 

(B) 81KJ/S 

(C) 54KJ/S 

(D) 27KJ/S 

Q.67 An oil of 2.5 litre weighs 5N at room temperature. The specific weight of the oil is 

(A) 2KN/m³ 

(B) 2N/m³

(C) 0.08N/m³ 

(D) 12.5N/m³ 

Q.68 A reversible engine with 25% operate with a higher temperature of 127° C. Then the sink  temperature is: 

(A) 54 degree C 

(B) 31.25° C 

(C) 100° C 

(D) 27° C 

Q.69 The relationship between Young’s modulus E and modulus of rigidity (G) using the poisson’s ratio µ is:

(A) G = E/2(1+ µ) 

(B) G = E/2(1- µ) 

(C) E = 2G/(1+ µ) 

(D) E = G/2(1+ µ) 

Q.70 The nominal thickness of the boundary layer is defined when the velocity reaches the velocity of  the free stream by: 

(A) 90% 

(B) 99% 

(C) 95% 

(D) 97% 

Q.71 A system in which the energy or matter flows into or out of the system is called as: 

(A) Open system 

(B) Adiabatic system 

(C) Isolated system 

(D) Transient system 

Q. 72 A tank carries an ideal gas at an absolute pressure of 4 bar at 27°C. If the temperature is  increased to 60°C. The pressure inside the tank if: 

(A) 4.44 bar 

(B) 2.22 bar 

(C) 8.88 bar 

(D) 5.55 bar 

Q. 73 The end fixity coefficient is sued in the crippling load equation based on Euler’s theory for buckling  of columns. The value of this coefficient for the case, one end is fixed, and the other end is hinged, is: 

(A) 1 

(B) 2.4 

(C) 0.25 

(D) 2

Q.74 The expression for notch sensitivity factor q, in cyclic loading, using fatigue stress concentration  factor K_f, and theoretical stress concentration factor K_t is: 

(A) Q = (Kf+1)/(Kt+1) 

(B) Q = (Kf-1)/(Kt-1) 

(C) Q = (Kf+1)/(Kt-1) 

(D) Q = (Kt-1)/(Kf-1) 

Q.75 The pressure ratio per stage for a centrifugal compressor is: 

(A) 16:1 

(B) 8:1 

(C) 4:1 

(D) 10:1 

Q.76 A double fillet weld is used to join the steel plates of 5mm thick for a length of 20mm. The  allowable tensile stress for the weld metal is 100MPa. The tensile strength of the joint is: 

(A) 7.07KN 

(B) 20KN 

(C) 14.14KN 

(D) 10KN 

Q.77 An oil having kinematic viscosity 15*10^-4 m²/s is flowing through a pipe of 300mm diameter. For  the velocity of oil flow 25m/s, The reynold’s number is: 

(A) 15000 

(B) 180 

(C) 5000 

(D) 1800 

Q.78 The minimum no. of teeth on the pinion which will mesh with any gear without interference for a  14 ½ full depth involute gear teeth is: 

(A) 18 

(B) 14 

(C) 32 

(D) 12 

Q.79 The critical radius of insulation for asbestos with k=0.125 W/Mk surrounding a pipe exposed to  room air with h=2.5W/m²K is: 

(A) 20mm 

(B) 312.5mm 

(C) 50mm 

(D) 5mm 

Q.80 A unit cell of face central cubical structure has _____ atoms per unit cell: 

(A) 4 

(B) 2 

(C) 8 

(D) 12 

Q.81 The analogy of conductivity in heat transfer to fluid flow is: 

(A) Density of fluid 

(B) Viscosity of fluid 

(C) Velocity of fluid 

(D) Pressure of fluid 

Q.82 The logarithmic mean temperature difference for parallel flow heat exchangers is: 

(A) (Ѳ1- Ѳ2)/(ln(Ѳ1- Ѳ2) 

(B) (Ѳ2- Ѳ1)/ln(Ѳ1/Ѳ2) 

(C) (Ѳ1- Ѳ2)/ln(Ѳ1+Ѳ2) 

(D) (Ѳ1- Ѳ2)/ln(Ѳ1/ Ѳ2)

Q.83 The oxy-acetylene gas used in gas welding produces a flame temperature of 

(A) 1800° C 

(B) 2100° C 

(C) 3200° C 

(D) 2400° C 

Q.84 A gear tooth profile generated using a curve traced by appoint on the circumference of a circle that  rolls without slipping on a fixed straight line is known as: 

(A) Epi-cycloid 

(B) Hypo-cycloid 

(C) Involute 

(D) Cycloid 

Q.85 The mercury does not wet the glass tube. This is due to the property of liquid known as: 

(A) Density 

(B) Compressibility 

(C) Surface tension 

(D) viscosity