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Mechanical engineering competitive exam previous year question paper

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deepa sahu
deepa sahu

This document contains 31 multiple choice questions related to mechanical engineering topics such as manufacturing processes, materials, thermodynamics, and mechanics. The questions cover gauges, gas turbines, casting processes, heat engines, hydraulics, welding, combustion, gear trains and more. Correct answers are provided for each question.

1 of 13
Mechanical engineering competitive exam previous year question paper
Mechanical engineering competitive exam previous year question paper
1. The gauge useful for checking the component dimension which lies within the permissible limits is a) Snap Gauge b) Limit gauge c) Go and no-go gauge d) Plug gauge ( b ) 2. The phenomenon in which fluctuation of speed continuously when there is small variation in load: a) Isochronism b) unstable c) Hunting d) Stable ( c ) 3. Which one of the following conditions is not satisfied for saturated air? a) DPT is equal to DBT b) 100% relative humidity c) Zero wet bulb depression d) Specific humidity is constant ( d )
4. The maximum magnitude of the unbalanced force along the perpendicular to the line of stroke is termed as a) Hammer Blow b) Swaying couple c) Hunting d) Tractive force ( a ) 5. A steel work piece is to be milled. Material removal rate is 25 cm3 /min, depth of cut and width of cut are 5 mm and 100 mm respectively. The rate of feed (table feed) is _________. a) 50 MRR= f*d*w b) 100 25000= f*5*100 c) 25 f= 50mm/min d) 125 ( a) 6. as per Kendall Notation, 'c' represents a) System capacity b) no. of parallel servers c) Size of calling population d) service time distribution ( b )
7. Which one following statements is incorrect regarding reheating process in gas turbine? a) It increase thermal efficiency b) It uses multistage expansion c) it reduces moisture which cause erosion of turbine blades d) It increase specific work output ( a ) 8. Which law of thermodynamics can be termed as law of degradation of energy? a) First law of thermodynamics b) Second law of thermodynamics c) Third law of thermodynamics d) Zeroth law of thermodynamics ( b ) 9. In sand casting, the following allowance is added to all linear dimensions of the casting? a) Draft allowance b) Shake allowance c) Shrinkage allowance d) Machining allowance ( c )
10. Which of the following is not a boiler mounting? a) Economizer b) Fusible plug c) Blow off cock d) Safety valve ( a ) 11. Two shafts, one hollow and the other solid made of same material and having same outside diameter. The inner diameter of the hollow shaft is half the outside diameter. The ratio of torque that can be transmitted by these two shafts is __________. a) 4/3 b) 16/15 c) 3/ 4 d) 15/16 ( d )
12. A solid circular shaft is subjected to bending moment of 3000N and a torsion of 10,000N-m. The equivalent bending moment would be a) 5920 b) 10440 c) 8000 d) 6720 ( d ) 13. The product of Grashoff number and Prandtl number is termed as. a) Weber number b) Prandtl number c) Reynolds number d) Fourier number ( c ) 14. A heat engine is provided with a heat input of 1800 kJ/min and the output from the engine is 9 kW. Thermal efficiency of the engine is . a) 66.66% b) 30% c) 50% d) 25% ( b )
15. A hydraulic press has a ram of 30 cm diameter and plunger of 3 cm diameter. Find the weight lifted by the hydraulic press when the force applied at the plunger is 500N. a) 50 b) 20 c) 30 d) 40 ( a ) 16. A control chart that makes use of poisson distribution is _ a) p- chart b) C- chart c) R – chart d) X – chart ( b ) 17. Examples of metals that crystallize in BCC, FCC & Close-packed Hexagonal, respectively are a) Alpha iron, Zinc & delta iron b) Gamma iron, Nickel & Zinc c) Alpha iron, delta iron & Zinc d) Alpha iron, gamma iron & Zinc ( d )
18. To achieve robust performance, the objective functions must capture performance of a) Both control and noise factor b) Controllable factor only c) Noise factor only d) All variable factor only ( a ) 19. Brazing is done with silver alloys with melting range of: a) 400 °C to 650 °C b) 600 °C to 850 °C c) 500 °C to 650 °C d) 300 °C to 450 °C ( b ) 20. G codes are used for creating CNC programs to control CNC machines. G 17 refers To:- a) Input in mm b) Selection of XY plane c) Selection of YZ plane d) Selection of XZ plane ( b )
21. Which one of the following milling operations is used to produce gears? a) Form Milling b) Slot Milling c) Face Milling d) Slab Milling ( a) 22. In an eutectic reaction: a) A liquid solution solidifies at constant temperature to form one modified liquid phase and one or more solid phases. b) A solid solution melts at constant temperature to form one solid phase and two or more liquid phases. c) A liquid solution solidifies at constant temperature to form two or more solid phases. d) A solid solution melts at constant temperature to form two or more liquid phases ( c ) 23. Dynamometer is used to find: a) torque at constant speed b) indicated power at constant speed c) volumetric efficiency at constant speed d) friction power at constant speed ( a )
24. Lewis number is defined as: a) the ratio of momentum diffusivity to thermal diffusivity. b) the ratio of thermal diffusivity to mass diffusivity. c) the ratio of mass diffusivity to thermal diffusivity. d) the ratio of momentum diffusivity to mass diffusivity. ( d) 25. A fusion welding process in which the weld is effected by pouring superheated liquid around the parts to be united, is known as : a) Diffusion welding b) percussion welding c) slag welding d) thermit welding ( d ) 26. 1 kg of carbon requires how many kg of oxygen for stoichiometric combustion? a) 3/8 kg b) 3/11 kg c) 8/3 kg d) 11/3 kg ( c ) 27. A clutch is operating under uniform wear, axial load of 500 N, friction coefficient of 0.3 and the mean radius of the contact surfaces 0.1 m. If the torque transmitted is 60 Nm, then the number of pairs of contact surfaces is: a) 6 b) 4 c) 2 d) 8 ( b )
28. Turning tool for brass usually has: a) apparent rake angle b) negative rake angle c) zero rake angle d) positive rake angle ( c ) 29. In lathe back gears, the following gear train is used : a) compound gear train b) reverted gear train c) simple gear train d) epicyclic gear train ( b ) 30. ----- is a dial type adjustable snap gauge used for external measurement? a) Dial gauge b) Vernier gauge c) Pass meter d) Screw gauge ( c) 31. Which of the following material is not commonly hot rolled a) Aluminum b) Magnesium c) Copper d) Titanium ( d )
Mechanical engineering competitive exam previous year question paper

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Mechanical engineering competitive exam previous year question paper

  • 3. 1. The gauge useful for checking the component dimension which lies within the permissible limits is a) Snap Gauge b) Limit gauge c) Go and no-go gauge d) Plug gauge ( b ) 2. The phenomenon in which fluctuation of speed continuously when there is small variation in load: a) Isochronism b) unstable c) Hunting d) Stable ( c ) 3. Which one of the following conditions is not satisfied for saturated air? a) DPT is equal to DBT b) 100% relative humidity c) Zero wet bulb depression d) Specific humidity is constant ( d )
  • 4. 4. The maximum magnitude of the unbalanced force along the perpendicular to the line of stroke is termed as a) Hammer Blow b) Swaying couple c) Hunting d) Tractive force ( a ) 5. A steel work piece is to be milled. Material removal rate is 25 cm3 /min, depth of cut and width of cut are 5 mm and 100 mm respectively. The rate of feed (table feed) is _________. a) 50 MRR= f*d*w b) 100 25000= f*5*100 c) 25 f= 50mm/min d) 125 ( a) 6. as per Kendall Notation, 'c' represents a) System capacity b) no. of parallel servers c) Size of calling population d) service time distribution ( b )
  • 5. 7. Which one following statements is incorrect regarding reheating process in gas turbine? a) It increase thermal efficiency b) It uses multistage expansion c) it reduces moisture which cause erosion of turbine blades d) It increase specific work output ( a ) 8. Which law of thermodynamics can be termed as law of degradation of energy? a) First law of thermodynamics b) Second law of thermodynamics c) Third law of thermodynamics d) Zeroth law of thermodynamics ( b ) 9. In sand casting, the following allowance is added to all linear dimensions of the casting? a) Draft allowance b) Shake allowance c) Shrinkage allowance d) Machining allowance ( c )
  • 6. 10. Which of the following is not a boiler mounting? a) Economizer b) Fusible plug c) Blow off cock d) Safety valve ( a ) 11. Two shafts, one hollow and the other solid made of same material and having same outside diameter. The inner diameter of the hollow shaft is half the outside diameter. The ratio of torque that can be transmitted by these two shafts is __________. a) 4/3 b) 16/15 c) 3/ 4 d) 15/16 ( d )
  • 7. 12. A solid circular shaft is subjected to bending moment of 3000N and a torsion of 10,000N-m. The equivalent bending moment would be a) 5920 b) 10440 c) 8000 d) 6720 ( d ) 13. The product of Grashoff number and Prandtl number is termed as. a) Weber number b) Prandtl number c) Reynolds number d) Fourier number ( c ) 14. A heat engine is provided with a heat input of 1800 kJ/min and the output from the engine is 9 kW. Thermal efficiency of the engine is . a) 66.66% b) 30% c) 50% d) 25% ( b )
  • 8. 15. A hydraulic press has a ram of 30 cm diameter and plunger of 3 cm diameter. Find the weight lifted by the hydraulic press when the force applied at the plunger is 500N. a) 50 b) 20 c) 30 d) 40 ( a ) 16. A control chart that makes use of poisson distribution is _ a) p- chart b) C- chart c) R – chart d) X – chart ( b ) 17. Examples of metals that crystallize in BCC, FCC & Close-packed Hexagonal, respectively are a) Alpha iron, Zinc & delta iron b) Gamma iron, Nickel & Zinc c) Alpha iron, delta iron & Zinc d) Alpha iron, gamma iron & Zinc ( d )
  • 9. 18. To achieve robust performance, the objective functions must capture performance of a) Both control and noise factor b) Controllable factor only c) Noise factor only d) All variable factor only ( a ) 19. Brazing is done with silver alloys with melting range of: a) 400 °C to 650 °C b) 600 °C to 850 °C c) 500 °C to 650 °C d) 300 °C to 450 °C ( b ) 20. G codes are used for creating CNC programs to control CNC machines. G 17 refers To:- a) Input in mm b) Selection of XY plane c) Selection of YZ plane d) Selection of XZ plane ( b )
  • 10. 21. Which one of the following milling operations is used to produce gears? a) Form Milling b) Slot Milling c) Face Milling d) Slab Milling ( a) 22. In an eutectic reaction: a) A liquid solution solidifies at constant temperature to form one modified liquid phase and one or more solid phases. b) A solid solution melts at constant temperature to form one solid phase and two or more liquid phases. c) A liquid solution solidifies at constant temperature to form two or more solid phases. d) A solid solution melts at constant temperature to form two or more liquid phases ( c ) 23. Dynamometer is used to find: a) torque at constant speed b) indicated power at constant speed c) volumetric efficiency at constant speed d) friction power at constant speed ( a )
  • 11. 24. Lewis number is defined as: a) the ratio of momentum diffusivity to thermal diffusivity. b) the ratio of thermal diffusivity to mass diffusivity. c) the ratio of mass diffusivity to thermal diffusivity. d) the ratio of momentum diffusivity to mass diffusivity. ( d) 25. A fusion welding process in which the weld is effected by pouring superheated liquid around the parts to be united, is known as : a) Diffusion welding b) percussion welding c) slag welding d) thermit welding ( d ) 26. 1 kg of carbon requires how many kg of oxygen for stoichiometric combustion? a) 3/8 kg b) 3/11 kg c) 8/3 kg d) 11/3 kg ( c ) 27. A clutch is operating under uniform wear, axial load of 500 N, friction coefficient of 0.3 and the mean radius of the contact surfaces 0.1 m. If the torque transmitted is 60 Nm, then the number of pairs of contact surfaces is: a) 6 b) 4 c) 2 d) 8 ( b )
  • 12. 28. Turning tool for brass usually has: a) apparent rake angle b) negative rake angle c) zero rake angle d) positive rake angle ( c ) 29. In lathe back gears, the following gear train is used : a) compound gear train b) reverted gear train c) simple gear train d) epicyclic gear train ( b ) 30. ----- is a dial type adjustable snap gauge used for external measurement? a) Dial gauge b) Vernier gauge c) Pass meter d) Screw gauge ( c) 31. Which of the following material is not commonly hot rolled a) Aluminum b) Magnesium c) Copper d) Titanium ( d )