Sample question paper for ONGC Exam for Mechanical Engineers is as given below:

Q1 For a Newtonian fluid:
(a) Shear stress is proportional to shear strain.
(b) Rate of Shear stress is proportional to shear strain.
(c)Shear stress is proportional to rate of shear strain.
(d) Rate of shear stress is proportional to rate of shear strain.

Q2 The number of inversions for a slider crank mechanism is
(a) 6
(b) 5
(c) 4
(d) 3

Q3 Dew point temperature is temperature at which condesation begins when the air is cooled at constant
(a) Volume
(b) Entropy
(c) pressure
(d) Enthalpy

Q4 In a pelton wheel, the bucket peripheral speed is 10m/s, the water jet velocity is 25m/s and volumetric flow rate of the jet is 0.1m3/s. If the jet deflection angle is 120 degrees and the flow is ideal, the power developed is
(a) 7.5 KW
(b)15.0 KW
(c)22.5 KW
(d) 37.5 KW
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Q5 An expandable pattern is used in
(a) Slush Casting
(b) Squeeze casting
(c) Centrifugal Casting
(d) Investment Casting

Q6 The main purpose of spheroidising treatment is to improve
(a) hardenability of low carbon steels
(b) machinability of low carbon steels
(c) hardenability of high carbon steels
(d) machinability of high carbon steels
Q7 NC countering is an example of
(a) Continuous path positoning
(b) Point to point positioning
(c) Absolute positioning
(d) Incremental positioning
Q8 A ring gauge is used to measure
(a) outside roundness but not roundness
(b) roundness but not outside diameter
(c) both outside diameters and roundness
(d) only external threads

Q9 Match the items in columns I and II
Column I Column II
A. Addendum 1. Cam
B.Instantaneous center of velocity 2. Beam
C. Section Modulus 3. Linkage
D. Prime Circle 4. Gear
(a) A-4 B-2 C-3 D-1
(b) A-4 B-3 C-2 D-1
(a) A-3 B-2 C-1 D-4
(a) A-3 B-4 C-1 D-2

Q10 A disk clutch is required to transmit 5KW at 2000 rpm. The disk has a friction limit with coefficient of friction equal to 0.25 . bore radius of friction lining is equal to 25mm. Assume uniform contact pressure of 1MPa. The value of outside radius of the friction lining is:
(a) 39.4mm
(b) 49.5mm
(c) 97.9mm
(d) 142.9mm

Q11 Twenty degree full depth involute profiled 19-tooth pinion and 37 tooth gear are in mesh. If the module is 5mm, the center distance between gear pair will be
(a) 140 mm
(b) 150 mm
(c) 280 mm
(d) 300 mm

Q12 A large hydraulic turbine is to generate 300KW at 1000 rpm under a head of 40m. For initial testing, a 1:4 scale model of turbine operators under a head of 10m. The power generated by the model (in KW) will be
(a) 2.34
(b) 4.68
(c) 9.38
(d) 18.75

Q13. A steel bar of 40mm X 40mm square cross section is subjected to an axial compressive load of 200KN. IF the length of bar is 2m and E =200 GPa, the elongation of the bar will be
(a) 1.25mm
(b) 2.70mm
(c) 4.05mm
(d) 5.40mm

Q14. IF the Cf is the coefficient of speed fluctuation of flywheel then the ratio of w max/ w min will be
(a) (1-2Cf)/(1+2Cf)
(a) (2-cf)/(1+2Cf)
(a) (1+2Cf)/(1-2Cf)
(d) (2+Cf)(2-Cf)

Q15 If a system is in equilibrium and the position of system depends upon many independent variables, the principal of virtual work states that the partial derivatives of its total potential energy with repsect to each of the independent variable must be
(a) -1.0
(b) 0
(c) 1.0
(d)∞

Q16) Match the items in Column I and Column II
Column I Column II
P.Higher kinematic pair 1. Grubler’s Equation
Q. Lower Kinematic pair 2. Line Contact
R. Quick Return Mechanism 3. Euler’s equation
S. Mobility of a linkage 4. Planer
5. Shaper
6. Surface contact
(a) P-2,Q-6,R-4,S-3
(b) P-6,Q-2,R-4,S-1
(c) P-6,Q-2,R-5,S-3
(d) P-2,Q-6,R-5,S-1

Q 17 A machine of 250kg mass is supported on springs of total stifness 100 KN/m. Machine has an unbalanced rotating force of 350 N at speed of 3600 rpm. Assume a damping factor of 0.15, the value of transmissibility ratio is
(a) 0.0531
(b) 0.9922
(c) 0.0162
(d) 0.0028

Q18 A 60mm long and 6mm thick fillet weld carries a steady load of 15KN along the weld. The shear strength of weld material is equal to 200MPa. The factor of safety is
(a) 2.4
(b) 3.4
(c) 4.8
(d) 6.8

Q19. A two dimensional flow field has velocities along the x and y directions given by u= x2t and v= -2xyt respectively where t is time. The equation of streamlines is
(a) x2y= Constant
(b) xy2= Constant
(c) xy = Constant
(d) not possible to determine