अगर आप NEST Exam की तैयारी कर रहे हैं और आपकी रुचि Mechanical Engineering में है, तो NEST Exam PYQ for Mechanical Engineering आपकी तैयारी को सही दिशा देने में बहुत मददगार साबित हो सकते हैं। Previous Year Questions से आपको यह समझ आता है कि exam में physics-based concepts, numerical problems और engineering aptitude को किस तरह से पूछा जाता है।
इस पोस्ट में हम NEST mechanical engineering PYQ की अहमियत, उनके pattern और preparation में सही उपयोग के बारे में विस्तार से बताएँगे। यह कंटेंट उन students के लिए खास है जो strong concepts के साथ NEST Exam में अच्छा score करना चाहते हैं और future में engineering field में career बनाना चाहते हैं।
NEST Mechanical Engineering Previous Year Questions
Q1. In thermodynamics, which property is path dependent?
- Entropy
- Enthalpy
- Internal Energy
- Work
Q2. Which cycle is commonly used in steam power plants?
- Otto cycle
- Diesel cycle
- Rankine cycle
- Brayton cycle
Q3. The SI unit of dynamic viscosity is:
- Pa·s
- m²/s
- N/m²
- kg/m³
Q4. Which law of thermodynamics defines absolute zero temperature?
- First law
- Second law
- Third law
- Zeroth law
Q5. Which type of stress is induced due to torsion?
- Tensile stress
- Compressive stress
- Shear stress
- Bending stress
Q6. In fluid mechanics, Reynolds number represents:
- Pressure force / viscous force
- Inertial force / viscous force
- Gravitational force / viscous force
- Surface force / inertial force
Q7. Which instrument is used to measure surface roughness?
- Vernier caliper
- Micrometer
- Profilometer
- Dial gauge
Q8. What is the function of a flywheel?
- Increase power
- Store energy
- Reduce friction
- Control speed
Q9. Which failure theory is suitable for ductile materials?
- Maximum principal stress theory
- Maximum shear stress theory
- Mohr’s theory
- Coulomb theory
Q10. Which material has the highest thermal conductivity?
- Steel
- Aluminium
- Copper
- Cast iron
Q11. What is the main function of a governor?
- Increase load
- Decrease fuel supply
- Maintain mean speed
- Start the engine
Q12. Which process occurs at constant entropy?
- Isothermal
- Isobaric
- Isochoric
- Isentropic
Q13. In casting, riser is used to:
- Remove gases
- Provide molten metal
- Improve surface finish
- Reduce shrinkage defects
Q14. Which bearing supports both radial and axial loads?
- Journal bearing
- Ball bearing
- Thrust bearing
- Roller bearing
Q15. What is the unit of heat transfer coefficient?
- W/m²K
- W/mK
- J/kgK
- N/m²
Q16. Which gear is used to transmit motion between intersecting shafts?
- Spur gear
- Helical gear
- Bevel gear
- Worm gear
Q17. The efficiency of a Carnot engine depends on:
- Working fluid
- Engine speed
- Temperature limits
- Pressure ratio
Q18. Which welding process uses no filler metal?
- Gas welding
- Arc welding
- Resistance welding
- TIG welding
Q19. What is the purpose of annealing?
- Increase hardness
- Relieve internal stresses
- Increase brittleness
- Improve wear resistance
Q20. Which type of flow has Reynolds number less than 2000?
- Turbulent flow
- Transitional flow
- Laminar flow
- Compressible flow
Q21. What is the value of Poisson’s ratio for perfectly incompressible material?
- 0
- 0.25
- 0.33
- 0.5
Q22. Which device converts reciprocating motion into rotary motion?
- Cam and follower
- Slider crank mechanism
- Geneva mechanism
- Belt drive
Q23. The main purpose of a condenser in a power plant is to:
- Increase steam pressure
- Condense exhaust steam
- Increase efficiency of turbine
- Heat feed water
Q24. Which of the following is a non-ferrous metal?
- Steel
- Cast iron
- Aluminium
- Wrought iron
Q25. Which type of clutch is used in scooters?
- Cone clutch
- Single plate clutch
- Multi-plate clutch
- Centrifugal clutch
Q26. The unit of modulus of elasticity is:
- N
- N/m
- N/m²
- Nm
Q27. Which test is used to determine hardness?
- Tensile test
- Impact test
- Brinell test
- Creep test
Q28. Which heat treatment process increases hardness?
- Annealing
- Normalizing
- Tempering
- Quenching
Q29. Which fluid is commonly used in hydraulic systems?
- Water
- Air
- Oil
- Steam
Q30. In IC engines, knocking is more severe in:
- Diesel engine
- Petrol engine
- Gas engine
- Steam engine
Q31. Which type of turbine is suitable for low head and high discharge?
- Pelton turbine
- Francis turbine
- Kaplan turbine
- Impulse turbine
Q32. The neutral axis in bending passes through:
- Top fiber
- Bottom fiber
- Centroid
- Extreme fiber
Q33. Which gauge is used to measure pressure above atmospheric pressure?
- Vacuum gauge
- Compound gauge
- Pressure gauge
- Manometer
Q34. The process of joining metals using heat and pressure is called:
- Riveting
- Bolting
- Welding
- Soldering
Q35. Which type of brake is commonly used in bicycles?
- Disc brake
- Drum brake
- Band brake
- Shoe brake
Q36. Which instrument measures angular displacement?
- Tachometer
- Dynamometer
- Protractor
- Speedometer
Q37. What is the main advantage of CNC machines?
- Low cost
- High accuracy
- Simple operation
- Manual control
Q38. Which metal is commonly used for bearings?
- Steel
- Bronze
- Aluminium
- Copper
Q39. The slope of stress–strain curve in elastic region represents:
- Yield stress
- Ultimate stress
- Modulus of elasticity
- Proof stress
Q40. Which machine element is used to prevent relative motion?
- Bearing
- Key
- Gear
- Coupling
Q41. Which law states that total energy of an isolated system remains constant?
- Zeroth law
- First law of thermodynamics
- Second law of thermodynamics
- Third law of thermodynamics
Q42. Which type of motion is exhibited by the piston in an IC engine?
- Rotary motion
- Oscillatory motion
- Reciprocating motion
- Circular motion
Q43. Which instrument is used to measure very small thickness?
- Steel rule
- Vernier caliper
- Micrometer screw gauge
- Dial indicator
Q44. Which of the following is an impulse turbine?
- Kaplan turbine
- Francis turbine
- Pelton turbine
- Reaction turbine
Q45. The unit of kinematic viscosity is:
- Pa·s
- kg/m·s
- m²/s
- N·s/m²
Q46. Which machine is used to reduce the size of materials?
- Lathe
- Drilling machine
- Crusher
- Milling machine
Q47. Which test determines impact strength of a material?
- Brinell test
- Izod test
- Tensile test
- Fatigue test
Q48. In gears, interference occurs when:
- Teeth are too strong
- Teeth are too weak
- Non-involute portion comes in contact
- Pitch circle increases
Q49. Which gas is commonly used in TIG welding?
- Oxygen
- Hydrogen
- Argon
- Nitrogen
Q50. What is the function of a cam?
- Transmit power
- Store energy
- Convert rotary motion into reciprocating motion
- Reduce speed
Q51. Which metal is best suited for electrical applications?
- Iron
- Aluminium
- Copper
- Steel
Q52. Which bearing is used to take axial load only?
- Journal bearing
- Ball bearing
- Thrust bearing
- Roller bearing
Q53. Which heat exchanger has fluids flowing in opposite directions?
- Parallel flow
- Cross flow
- Counter flow
- Mixed flow
Q54. Which process improves machinability of steel?
- Quenching
- Annealing
- Hardening
- Carburizing
Q55. Which drive is used for long distance power transmission?
- Belt drive
- Chain drive
- Gear drive
- Rope drive
Q56. What is the SI unit of power?
- Joule
- Newton
- Watt
- Pascal
Q57. Which type of joint is permanent?
- Bolted joint
- Riveted joint
- Knuckle joint
- Pin joint
Q58. The ratio of actual COP to ideal COP is called:
- Efficiency
- Effectiveness
- Relative efficiency
- Mechanical efficiency
Q59. Which pump is suitable for viscous fluids?
- Centrifugal pump
- Reciprocating pump
- Gear pump
- Jet pump
Q60. Which instrument is used to measure torque?
- Tachometer
- Dynamometer
- Speedometer
- Manometer
Q61. Which law states that heat cannot be completely converted into work?
- First law of thermodynamics
- Second law of thermodynamics
- Third law of thermodynamics
- Zeroth law
Q62. Which type of stress develops due to bending moment?
- Shear stress
- Torsional stress
- Bending stress
- Thermal stress
Q63. Which measuring instrument is used for checking flatness?
- Feeler gauge
- Surface plate
- Slip gauge
- Vernier caliper
Q64. Which fuel has the highest calorific value?
- Coal
- Diesel
- Petrol
- Hydrogen
Q65. Which device is used to absorb shock and vibration?
- Flywheel
- Governor
- Shock absorber
- Clutch
Q66. Which metal is mainly used for making piston?
- Cast iron
- Steel
- Aluminium alloy
- Brass
Q67. Which cycle is used in gas turbine power plants?
- Otto cycle
- Diesel cycle
- Rankine cycle
- Brayton cycle
Q68. Which defect occurs due to improper fusion in welding?
- Porosity
- Crack
- Lack of fusion
- Slag inclusion
Q69. Which bearing is commonly used in bicycle wheels?
- Journal bearing
- Roller bearing
- Ball bearing
- Thrust bearing
Q70. Which machine converts mechanical energy into hydraulic energy?
- Turbine
- Compressor
- Pump
- Nozzle
Q71. Which test is used to determine fatigue strength?
- Impact test
- Creep test
- Fatigue test
- Tensile test
Q72. Which type of gear has teeth inclined to the axis?
- Spur gear
- Bevel gear
- Helical gear
- Worm gear
Q73. What is the purpose of a coupling?
- Increase speed
- Transmit power between shafts
- Store energy
- Reduce vibration
Q74. Which process is used to produce hollow pipes?
- Rolling
- Forging
- Extrusion
- Casting
Q75. Which refrigerant is eco-friendly?
- R-12
- R-22
- R-134a
- Ammonia
Q76. Which machine tool is known as the mother of all machines?
- Milling machine
- Lathe machine
- Drilling machine
- Shaper
Q77. Which phenomenon causes failure below yield stress?
- Creep
- Fatigue
- Buckling
- Plastic deformation
Q78. Which instrument is used to measure flow rate?
- Manometer
- Venturimeter
- Barometer
- Altimeter
Q79. Which metal is corrosion resistant?
- Iron
- Copper
- Aluminium
- Cast iron
Q80. Which component controls fuel supply in diesel engine?
- Carburetor
- Injector
- Spark plug
- Governor
Q81. Which property of material indicates resistance to sudden shock?
- Hardness
- Toughness
- Ductility
- Elasticity
Q82. Which cycle ideally represents a petrol engine?
- Diesel cycle
- Otto cycle
- Rankine cycle
- Brayton cycle
Q83. Which machine element is used to join two shafts permanently?
- Coupling
- Clutch
- Bearing
- Brake
Q84. Which device measures atmospheric pressure?
- Manometer
- Barometer
- Altimeter
- Pressure gauge
Q85. Which process increases carbon content on the surface of steel?
- Annealing
- Normalizing
- Carburizing
- Tempering
Q86. Which turbine is most suitable for high head and low discharge?
- Francis turbine
- Kaplan turbine
- Pelton turbine
- Reaction turbine
Q87. What is the main function of lubricant?
- Increase wear
- Reduce friction
- Increase temperature
- Reduce efficiency
Q88. Which casting defect occurs due to entrapped gas?
- Cold shut
- Misrun
- Blow holes
- Hot tear
Q89. Which stress is maximum at the outer surface in bending?
- Shear stress
- Direct stress
- Bending stress
- Torsional stress
Q90. Which pump is used for deep wells?
- Centrifugal pump
- Jet pump
- Gear pump
- Reciprocating pump
Q91. Which device controls the speed of an engine automatically?
- Flywheel
- Governor
- Clutch
- Brake
Q92. Which welding process uses a non-consumable electrode?
- MIG welding
- Arc welding
- TIG welding
- Gas welding
Q93. What is the SI unit of strain?
- Meter
- Newton
- No unit
- Pascal
Q94. Which test determines ductility of material?
- Impact test
- Tensile test
- Hardness test
- Fatigue test
Q95. Which gear is used to transmit motion between non-parallel and non-intersecting shafts?
- Spur gear
- Bevel gear
- Helical gear
- Worm gear
Q96. Which type of joint allows angular movement?
- Rigid joint
- Knuckle joint
- Riveted joint
- Welded joint
Q97. Which refrigerant is widely used in domestic refrigerators?
- R-12
- R-22
- R-134a
- Ammonia
Q98. Which operation is performed on a lathe machine?
- Drilling
- Turning
- Shaping
- Planing
Q99. Which phenomenon causes gradual deformation under constant load at high temperature?
- Fatigue
- Creep
- Buckling
- Elasticity
Q100. Which device is used to measure rotational speed?
- Dynamometer
- Speedometer
- Tachometer
- Manometer
Q101. Which property of fluid resists relative motion between its layers?
- Density
- Viscosity
- Surface tension
- Compressibility
Q102. Which component of IC engine ignites the air–fuel mixture in petrol engine?
- Injector
- Carburetor
- Spark plug
- Fuel pump
Q103. Which metal has highest electrical conductivity?
- Copper
- Aluminium
- Silver
- Gold
Q104. Which stress is developed due to axial tensile load?
- Bending stress
- Torsional stress
- Shear stress
- Direct stress
Q105. Which casting process is suitable for mass production with good surface finish?
- Sand casting
- Shell moulding
- Die casting
- Investment casting
Q106. Which type of compressor is used in domestic refrigerators?
- Centrifugal compressor
- Axial compressor
- Reciprocating compressor
- Rotary compressor
Q107. Which failure theory is most suitable for brittle materials?
- Maximum shear stress theory
- Maximum principal stress theory
- Distortion energy theory
- Maximum strain energy theory
Q108. Which law of thermodynamics introduces the concept of temperature?
- First law
- Second law
- Third law
- Zeroth law
Q109. Which machine tool is used to produce flat surfaces?
- Lathe
- Milling machine
- Shaper
- Drilling machine
Q110. Which brake is commonly used in automobiles?
- Band brake
- Disc brake
- Shoe brake
- Block brake
Q111. Which instrument is used to measure very low pressure?
- Barometer
- Manometer
- Vacuum gauge
- Pressure gauge
Q112. Which property of material allows it to be drawn into wires?
- Malleability
- Ductility
- Elasticity
- Plasticity
Q113. Which type of pump works on positive displacement principle?
- Centrifugal pump
- Jet pump
- Gear pump
- Axial flow pump
Q114. Which process is used to join thin metal sheets?
- Riveting
- Spot welding
- Forging
- Casting
Q115. Which bearing is suitable for high speed operation?
- Journal bearing
- Ball bearing
- Thrust bearing
- Footstep bearing
Q116. Which process improves wear resistance of steel?
- Annealing
- Normalizing
- Carburizing
- Tempering
Q117. Which turbine is classified as reaction turbine?
- Pelton turbine
- Kaplan turbine
- Impulse turbine
- Jet turbine
Q118. Which type of joint uses cotter?
- Knuckle joint
- Cotter joint
- Riveted joint
- Welded joint
Q119. Which phenomenon occurs due to repeated loading and unloading?
- Creep
- Fatigue
- Buckling
- Plastic deformation
Q120. Which instrument is used to measure internal diameter accurately?
- Outside micrometer
- Vernier caliper
- Inside micrometer
- Slip gauge
Q. In thermodynamics, which property is independent of the path followed?
- Work
- Heat
- Internal Energy
- Entropy Generation
Q. The Poisson’s ratio for perfectly incompressible material is:
- 0.25
- 0.33
- 0.5
- 1.0
Q. Which cycle is used in gas turbine power plants?
- Rankine cycle
- Otto cycle
- Brayton cycle
- Diesel cycle
Q. In a four-stroke IC engine, how many power strokes occur per cycle?
- One
- Two
- Three
- Four
Q. The unit of dynamic viscosity is:
- m²/s
- N/m²
- Pa·s
- kg/m³
Q. Which mechanism converts rotary motion into reciprocating motion?
- Cam and follower
- Slider crank mechanism
- Gear train
- Belt drive
Q. In welding, slag is mainly formed in:
- Gas welding
- Arc welding
- Resistance welding
- Spot welding
Q. Which test is used to determine hardness?
- Izod test
- Charpy test
- Brinell test
- Erichsen test
Q. The efficiency of Carnot engine depends on:
- Working substance
- Temperature limits
- Pressure ratio
- Engine speed
Q. Which bearing is suitable for axial loads?
- Journal bearing
- Ball bearing
- Thrust bearing
- Roller bearing
Q. The modulus of rigidity is also known as:
- Young’s modulus
- Bulk modulus
- Shear modulus
- Elastic modulus
Q. Which instrument is used to measure pressure difference?
- Barometer
- Manometer
- Thermometer
- Anemometer
Q. In machining, which tool has single cutting edge?
- Drill
- Milling cutter
- Lathe tool
- Grinding wheel
Q. Which process is used to join thin metal sheets?
- Butt welding
- Spot welding
- Forge welding
- Arc welding
Q. What is the SI unit of torque?
- Nm
- N/m
- Joule
- Watt
Q. Which law governs heat conduction?
- Newton’s law
- Fourier’s law
- Stefan’s law
- Ohm’s law
Q. Which gear has teeth parallel to axis?
- Spur gear
- Bevel gear
- Worm gear
- Helical gear
Q. In refrigeration, COP stands for:
- Coefficient of Performance
- Capacity of Plant
- Coefficient of Pressure
- Cooling Output Power
Q. Which material is commonly used for cutting tools?
- Mild steel
- Cast iron
- High speed steel
- Aluminium
NEST Exam में Mechanical Engineering से जुड़े concepts को मजबूत करने के लिए Previous Year Questions का अभ्यास करना सबसे smart तरीका है। PYQs से आपको important topics, question level और exam trend की साफ समझ मिलती है।
अगर आप regular practice के साथ NEST exam PYQ for mechanical engineering को analyse करते हैं, तो आपकी problem-solving ability और confidence दोनों बेहतर होंगे। सही strategy, consistent revision और PYQs के साथ NEST Exam में success हासिल की जा सकती है।
