RRB JE PYQ 22 April 2025 (9 AM – 11 AM)
RRB JE PYQ 22 April 2025 (9 AM – 11 AM)
1. Which of the following is not a mechanical finishing process?
1. Burnishing
2. Pickling
3. Shot peening
4. Buffing
Show Answer
Answer: 2
2. Which of the following is used in organic coating as catalysts that speed up the cure reaction?
1. Colloidal stabillisers
2. UV stabilisers
3. Plasticisers
4. Cure additives
Show Answer
Answer: 4
3. In a two-stroke petrol engine, which of the following best describes the sequence of events during an exhaust stroke?
1. The exhaust port opens first, followed by the transfer port.
2. Both ports open simultaneously.
3. The transfer port opens first, followed by the exhaust port.
4. The exhaust port opens and closes before the transfer port opens.
Show Answer
Answer: 1
4. Pressure head in a fluid system is best described as:
1. The kinetic energy per unit weight of the fluid
2. The difference between absolute and gauge pressure
3. The height of a fluid column equivalent to the pressure exerted by the fluid
4. The rate of fluid flow per unit cross-sectional area
Show Answer
Answer: 3
5. If torsional rigidity increases in the torsion equation, then the:
1. Angle of twist first increases then decreases
2. Angle of twist decreases
3. Angle of twist increases
4. Angle of twist remains constant
Show Answer
Answer: 2
6. Class ___ items are those that are 30–40% of all inventory items and account for 30–40% of total rupee consumption volume of the inventory . These are important , but not critical , and do NOT pose sourcing difficulties .
1. B
2. C
3. X
4. A
Show Answer
Answer: 1
7. Which of the following is the function of hose pipes in the gas welding process?
1. Protects the eyes from harmful heat and ultraviolet rays
2. Supplies the gases from the pressure regulators
3. Mixes oxygen and acetylene in the correct proportion
4. Remove the oxide film and maintains a clean surface
Show Answer
Answer: 2
8. What is the function of shielding gas in Gas Tungsten ARC Welding (GTAW)?
1. Protects the consumable coated electrode and the molten metal weld pool from the atmospheric contamination
2. Protects the tungsten electrode and the molten metal weld pool from the atmospheric contamination
3. Remove the slag by striking and conducts current to pass through it
4. Protects the consumable bare electrode and the molten metal weld pool from the atmospheric contamination
Show Answer
Answer: 2
9. In four – stroke diesel engine , which valves are closed during the expansion stroke?
1. Only the exhaust valve
2. Neither inlet valve nor exhaust valve
3. Only the inlet valve
4. Both inlet and exhaust valves
Show Answer
Answer: 4
10. What is the basic essential condition for coating material in hot dipping?
1. It should have a higher melting point than the base metal
2. It should form an alloy at the interface with the base metal
3. It should completely evaporate during the process
4. It should have lower wettability
Show Answer
Answer: 2
11. Which of the following assumptions is essential for applying Bernoulli’s theorem?
1. The flow is steady , incompressible and frictionless
2. The fluid is viscous and incompressible
3. The fluid has high compressibility
4. The flow is turbulent and rotational
Show Answer
Answer: 1
12. Identify the class A items as per the ABC analysis in inventory .
1. The next 15 – 25% account for 10-20% of the consumption
2. The balance 65-75% account for 70-80% of theconsumption
3. The balance 65-75% account for 5-10% of the consumption
4. 10-20% of the items account for 70-80% of the consumption
Show Answer
Answer: 4
13. What is the number of divisions on the vernier scale of a Universal Bevel Protractor?
1. 46
2. 70
3. 60
4. 24
Show Answer
Answer: 4
14. A symmetrical T – section has its plange horizontal on top . Its diameter are : Flange : Width = 100mm , thickness = 24 mm ; Height = 84 mm , thickness = 20 mm . Its moment of inertia about a vertical axis through its centroid parallel to the web is (in mm⁴) :
1. 2056 × 10³
2. 431 × 10⁴
3. 451 × 10⁴
4. 384,0000
Show Answer
Answer: 1
15. Which area under the stress strain curve represents the toughness of a material?
1. Total area under the curve
2. Area of plastic region
3. Area of elastic region
4. Slope of the elastic region
Show Answer
Answer: 1
16. In an air standard cycle , heat addition is assumed to occur _____
1. From an external constant high temperature source
2. Through internal combustion of fuel
3. By direct contact with a flame
4. From a combination reactions and external sources
Show Answer
Answer: 1
17. Which of the following movements of the grinding wheel is possible in a chucking type internal grinder?
1. Only rotational movement
2. Only vibrations movement
3. Both rotational and reciprocating movement
4. Only reciprocating movement
Show Answer
Answer: 3
18. In which of welding flame is oxygen proportion more compared to acetylene proportion?
1. Reducing welding flame
2. Carburizing welding flame
3. Oxidising welding flame
4. Neutral welding flame
Show Answer
Answer: 3
19. What is the impact of effective preplanning on the economic efficiency of a manufacturing operation?
1. Prevention of the production of large uneconomic outpur
2. Increase in the complexity of the production process
3. Elimination of the need for any forcasting
4. Focus on the design of jigs and tools
Show Answer
Answer: 1
20. Given an annual usage value of 400 units , the procurement cost is Rs.20 per order , cost per piece is Rs.100 and cost of carrying inventory is 10% . Calculate the EOQ .
1. 60
(b) 40
(c) 30
(d) 50
Show Answer
Answer: 2
21. According to the Principle of Resolution , the algebraic sum of the resolved parts of multiple forces in a given direction is equal to :
1. The difference between the largest and smallest force
2. The sum of all forces acting in that direction
3. The total magnitude of all forces combined
4. The resolved part of their resultant in the same direction
Show Answer
Answer: 4
22. The vaned diffuser in a centrifugal pump serves to:
1. Accelerate the fluid
2. Reduce cavitation by increasing turbulence
3. Control the pump’s rotational speed
4. Convert kinetic energy into pressure energy
Show Answer
Answer: 4
23. What is the complete form of ‘LVDT’ , one of the most popular electromechanical comparators?
1. Longitudinal variable differential transformer
2. Linear variable dimensional transformer
3. Linear variable differential transformer
4. Linear versatile differential transformer
Show Answer
Answer: 3
24. Despite having the highest possible efficiency for Carnot cycle , it is not suitable for a practical engine using a gaseous working fluid as :
1. The cycle requires very high pressures that are hard to manage
2. It is easy to maintain isothermal processes in practice
3. It is impossible to achieve perfectly reversible processes
4. The work output from the cycle is quite low
Show Answer
Answer: 3
25. Which of the following hardness scales uses a diamond cone indenter?
1. Mohs scale
2. Brinell scale
3. Vickers scale
4. Rockwell C scale
Show Answer
Answer: 4
26. The creep rate in a material increases when :
1. Stress is increased
2. The temperature is decreased
3. The material is stretched
4. Alloying elements are removed
Show Answer
Answer: 1
27. The work done by the load in stretching the bar is known as :
1. Strain Energy
2. Potential Energy
3. Kinetic Energy
4. Dislocation Energy
Show Answer
Answer: 1
28. In a dry sump lubrication system , how is oil returned to the storage tank?
1. Centrifugal force separates oil from air
2. A scavenge pump actively pumps oil back
3. Oil remains in the engine block indefinitely
4. Gravity drains oil directly to the crankcase
Show Answer
Answer: 2
29. What is meant by the resolution of a force?
1. Changing the direction of a force without altering magnitude
2. Combining multiple forces to form a single resultant
3. Splitting a force into components without changing its effect
4. Reducing the magnitude of a force in a given direction
Show Answer
Answer: 3
30. Atmospheric pressure is:
1. The pressure exerted by the Earth’s atmosphere at any given point
2. The pressure difference between two fluids
3. The pressure inside a fluid container
4. The pressure of a vacuum
Show Answer
Answer: 1
31. Shielding Metal Arc Welding (SMAW) is also called ______ .
1. Gas Tungsten Arc Welding
2. Tungsten Inert Gas Welding
3. Metal Inert Gas Welding
4. Manual Metal Arc Welding
Show Answer
Answer: 4
32. The main objective of the sequencing problem in production is to :
1. Ignore the order of job processing
2. Maximise the number of jobs processed
3. Increase the processing time of jobs
4. Minimise the idle time of machines
Show Answer
Answer: 4
33. A simple supported beam with a span length of 4m carries a uniform load of intensity 5 N/m throughout its length . What will the valve of the maximum bending moment (in N-n) in the beam be?
1. 10
2. 0
3. 20
4. 4
Show Answer
Answer: 1
34. What does the process of Principle of Arc welding involve?
1. Creating flow of electric current in the air gap between the electrode and the workpiece to melt the metal
2. Supplying oxygen and acetylene between the electrodes to melt the metal
3. Creating a chemical reaction between the electrode and the workpiece to melt the metal
4. Creating friction between the electrode and the workpiece to melt the metal
Show Answer
Answer: 1
35. For machining yellow metals and free-cutting steels, ______ is/are used as cutting fluids .
1. Water soluble oils
2. Germicides and water
3. Water
4. Insoluble Oils
Show Answer
Answer: 1
36. Which of the following is not an angular measurement device?
1. Spirit level
2. Autocollimator
3. Digital Micrometer
4. Sine Bar
Show Answer
Answer: 3
37. What distinguishes a semi-open impeller from an open impeller?
1. A semi-open impeller lacks any vanes
2. A semi-open impeller has vanes on both sides
3. A semi-open impeller has a partial shroud on one side
4. A semi-open impeller is completely enclosed by a casting
Show Answer
Answer: 3
38. Relative efficiency of an engine is defined as the ratio of:
1. Mechanical efficiency to volumetric efficiency
2. Actual thermal efficiency to air-standard efficiency
3. Brake thermal efficiency to indicated thermal efficiency
4. Actual thermal efficiency to Carnot efficiency
Show Answer
Answer: 2
39. Identify the milling cutter used for parting off operations or cutting thin slots .
1. Angle milling cutter
2. Plain milling cutter
3. Fly milling cutter
4. Metal slitting cutter
Show Answer
Answer: 4
40. What defines a black body in the context of thermal radiation?
1. An idealised object that absorbs all incident radiation and emits the maximum possible radiation to a given temperature
2. An object with perfect thermal insulation
3. A surface that reflects all incident radiation with absorption
4. A material that only emits visible light
Show Answer
Answer: 1
41. How is thermal efficiency defined in the context of internal combustion engines?
1. The ratio of indicated power to frictional power losses
2. The ratio of the engine displacement to the fuel mass used
3. The ratio of exhaust gas temperature to the intake air temperature
4. The ratio of useful work output of the total chemical energy input from fuel
Show Answer
Answer: 4
42. In drilling operations , a coolant is used to
1. Clean the drill bit
2. Cool down the drill bit
3. Reduce durability of drill bit
4. Heat the drill bit
Show Answer
Answer: 2
43. A built up section is made by joining two equal I-section at the flanges at their outer faces so that the composite consists of one I-section above the other . The moment of inertia of each section through a centroidal axis parallel to the web is Iyy . The moment of inertia of the composite built-up section about a similar axis is:
1. Iγγ/2
2. 2Iγγ
3. 4Iγγ
4. Iγγ
Show Answer
Answer: 2
44. _____ is/are the most widely used material for the broaches in a broaching operation .
1. Silver copper combination
2. Copper
3. Metal matrix composites
4. High speed steel
Show Answer
Answer: 4
45. Why does cast iron have high compressive strength but low tensile strength?
1. Due to its elastic properties
2. Due to its high malleability
3. Due to its ductile nature
4. Due to the presence of graphite flakes
Show Answer
Answer: 4
46. Why is the concept of transmissibility of forces valid for a rigid body?
1. Because a rigid body does not deform under applied forces
2. Because a rigid body always has an infinite number of forces acting on it
3. Because forces always act in the direction of motion
4. Because internal forces in a rigid body do not exist
Show Answer
Answer: 1
47. Brazing is a process of _____ metals without melting the base metal .
1. Cutting
2. Melting
3. Drilling
4. Joining
Show Answer
Answer: 4
48. Specific volume of a fluid is the reciprocal of its _____ .
1. Surface tension
2. Viscosity
3. Mass density
4. Dynamic viscosity
Show Answer
Answer: 3
49. In torch brazing , heat is produced by burning a mixture of ____ .
1. Oxy-acetylene gas
2. Oxy-neon gas
3. Oxy-nitrogen gas
4. Oxy-hydrogen gas
Show Answer
Answer: 1
50. While measuring surface texture , the part of the profilometer that makes contact with the workpiece surface is _____ .
1. A motorised mechanism
2. A finely pointed stylus
3. An electrical pickup
4. A recording unit
Show Answer
Answer: 2
51. Soldering is a _____ similar or dissimilar metals by heating them to a required temperature .
1. Method of cooling
2. Method of joining
3. Method of boring
4. Method of cutting
Show Answer
Answer: 2
52. Inventory control begins with ____ analysis , a fundamental supply chain activity frequently performed by inventory controllers and materials managers .
1. XYS
2. VED
3. ABC
4. FSN
Show Answer
Answer: 3
53. In a battery or coil ignition system , what is the role of the ignition coil ?
1. To compress the air entering the combustion chamber
2. To regulate the fuel injection timing
3. To control the engine’s exhaust temperature
4. To transform the low battery voltage into a high voltage required for spark generation
Show Answer
Answer: 4
54. In a ‘spirit-level device’ , to which point of the glass vial does the bubble always move?
1. Random point
2. Highest point
3. Middle point
4. Lowest point
Show Answer
Answer: 2
55. A bench mounted drilling machine is of the same type as a ____ .
1. Sensitive drilling machine
2. Deep hole drilling machine
3. Radial drilling machine
4. Gang drilling machine
Show Answer
Answer: 1
56. Impact strength is usually measured in units of:
1. Joules
2. Newtons
3. Watts
4. Pascals
Show Answer
Answer: 1
57. Which of the following expressions can determine the longitudinal feed rate in “Through Feed Centreless Grinding”?
(If the diameter of the regulating wheel) = D , r.p.m. of the regulating wheel = N , angle of inclination of the regulating wheel = θ)
1. Longitudinal feed rate = ∏ x D x N x Sin (θ)
2. Longitudinal feed rate = [∏ x D x N] / Sin (θ)
3. Longitudinal feed rate = ∏ x D x N x Cos (θ)
4. Longitudinal feed rate = [∏ x D x N] / Cos (θ)
Show Answer
Answer: 1
58. Which welding process is not classified under arc welding processes ?
1. Tungsten Inert Gas Welding
2. Stud Arc Welding
3. Atomic Hydrogen Welding
4. Electrostag Welding
Show Answer
Answer: 3
59. What should be the included angle of the cutting tool used for machining metric thread in a thread cutting operation?
1. 45 degrees
2. 60 degrees
3. 75 degrees
4. 55 degrees
Show Answer
Answer: 2
60. Which of the following wheels supports the workpiece in internal centreless grinding operation?
1. Pressure roller , supporting roller and regulating wheels
2. Only pressure roller
3. Only supporting roller
4. Only regulating wheel
Show Answer
Answer: 1
61. Among the following , which can be classified as a statically indeterminate beam?
1. Fixed beam
2. Simple supported beam
3. Overhanging beam
4. Cantilever beam
Show Answer
Answer: 1
62. What is the function of a shank in a broaching machine?
1. Removes chips and coolant from the cutting area
2. Breaks up the chips generated during the broaching process
3. Holds the broach in place and gives it a rotary motion
4. Guides the broach through the material and maintains tool alignment
Show Answer
Answer: 4
63. One design advantage of a single volute casing is that:
1. It allows for multiple impeller stages
2. It provides balanced radial forces
3. It minimises hydraulic losses by equalising pressure distribution
4. It simplifies the manufacturing process
Show Answer
Answer: 4
64. What does the Polygon Law of Forces describe?
1. The equilibrium condition of multiple forces
2. The method to find the resultant of multiple forces
3. The interaction between two perpendicular forces
4. The force required to balance a single force
Show Answer
Answer: 2
65. The structure list of components and sub-assemblies needed to manufacture a final product is represented by the
1. Lead time
2. Master file
3. Bill of materials
4. Components directory
Show Answer
Answer: 3
66. The overall efficiency of a pump is calculated by comparing :
1. The hydraulic power output to the mechanical power input
2. The volumetric flow rate to the pump casting size
3. The manometric head to the fluid velocity
4. The pump speed to the impeller diameter
Show Answer
Answer: 1
67. If two forces act at a right angle (90°) , what will be the magnitude of their resultant force?
1. R = √F1² + F2²
2. R = F1 – F2
3. R = 2F1F2cosθ
4. R = F1 + F2
Show Answer
Answer: 1
68. Two shafts , A and B are of the same material . If the diameter of A is thrice the diameter of B , then the torque that can be transmitted by A will be :
1. 9 times that of B
2. 27 times that of B
3. 16 times that of B
4. 64 times that of B
Show Answer
Answer: 2
69. The power required to drive a pump is calculated by considering :
1. Only the mechanical friction in the pump
2. The pump’s weight
3. The work done in overcoming hydraulic losses and delivering the desired head
4. Only the hydraulic power output
Show Answer
Answer: 3
70. Which of the following is an example of forced convection?
1. Heat transfer through a stationary fluid layer
2. Thermal energy transmitted by electromagnetic waves
3. Warm air naturally rising from a hot surface
4. Air blown over a car radiator by a fan
Show Answer
Answer: 4
71. Which of the following is a key advantage of CNC lathes in turning operations?
1. They provide higher automation and complex machining cycles
2. They are limited to simple machining operations
3. They are less accurate than conventional chucking machines
4. They rely mainly on mechanical devices for control
Show Answer
Answer: 1
72. Which area under the stress – strain curve represents the toughness of a material?
1. Total area under the curve
2. Area of plastic region
3. Area of elastic region
4. Slope of the elastic region
Show Answer
Answer: 1
73. In submerged Arc welding , _______ electrode is used in combination with a flux feeder tube .
1. Non – consumable baked carbon
2. Non – consumable tungsten
3. Non – consumable graphite
4. Consumable bare
Show Answer
Answer: 4
74. Which type of steel would be best suited for application required both high strength and good corrosion resistance?
1. High – carbon steel
2. Low – alloy steel
3. Mild steel
4. Stainless steel
Show Answer
Answer: 4
75. What will be the value of the maximum absolute shear stress produced in a thin cylinder if hoop stress = 40 MPa and longitudinal stress = 20 MPa?
1. 10 MPa
2. 60 MPa
3. 30 MPa
4. 20 MPa
Show Answer
Answer: 4
76. What is a primary advantage of using an open impeller design?
1. Easier inspection and clearing compared to closed impellers
2. Improved efficiency due to reduces flow separation
3. Higher pressure generation compared to radial flow pumps
4. Complete elimination of cavitation risks
Show Answer
Answer: 1
77. The Vickers hardness number (VHN) for a material with a 20 kg load and an average indentation diagonal of 0.3 mm is:
1. 78
2. 324
3. 115
4. 412
Show Answer
Answer: 4
78. Which of the following best describes the strength of mild steel compared to alloy steel?
1. Alloy steel generally has higher strength than mild steel
2. Mild steel generally has higher strength than alloy steel
3. Both mild steel and alloy steel have the same strength
4. Mild steel is stronger in compression but weaker in tension than alloy steel
Show Answer
Answer: 1
79. What is the typical behaviour of creep deformation in materials at very high temperatures (above 0.5 times the melting temperature)?
1. Materials exhibits significant plastic deformation
2. Rapid deformation and fractures
3. Material becomes more brittle and fails instantly
4. Deformation in material is negligible
Show Answer
Answer: 1
80. Which of the following is the correct sequence for the IS specification of any grinding wheel?
1. Abrasive used – Structure – Grade – Grit number – Bond Type
2. Abrasive used – Grit number – Structure – Grade – Bond Type
3. Abrasive used – Grit number – Grade – Structure – Bond Type
4. Abrasive used – Grade – Structure – Grid number – Bond type
Show Answer
Answer: 3
81. In a four stroke cycle diesel engine , the intake valve starts to open at _____ .
1. 25° – 40° after BDC
2. 10° – 25° before TDC
3. 25° – 40° before BDC
4. 10° – 15° after TDC
Show Answer
Answer: 3
82. In a profile projector , the magnified image of the workpiece is created by :
1. Mirrors
2. A vernier micrometer
3. Projection lens
4. Condenser lens
Show Answer
Answer: 3
83. A cantilever beam with a span length of L m carries a uniform moment of intensity ‘M’ N – m/m . Which of the following statements is correct?
1. Shear force throughout the length will be M/L .
2. Shear force throughout the length will be ML .
3. Shear force throughout the length will be zero .
4. Shear force throughout the length will be ML/2 .
Show Answer
Answer: 3
84. The key step in making a dimensional measurement using a tool maker’s microscope is _____ .
1. Adjusting the focus on the workpiece
2. Changing the objective lens power
3. Aligning the cross – wires with the measurement points
4. Viewing the magnified image
Show Answer
Answer: 1
85. For a closed system undergoing a thermodynamic cycle , the first law states which of the following?
1. Net work done equals net heat transfer
2. Entropy always increases
3. Pressure and temperature are inversely related .
4. Internal energy remains constant .
Show Answer
Answer: 1
86. It is important for the piston to fit ‘snugly’ into the cylinder to :
1. Neither allow for easy movement nor provide a gas – tight space
2. Provide a gas – tight space alone
3. Both , allow for easy movement and provide a gas – tight space
4. Allow for easy movement alone
Show Answer
Answer: 3
87. What is the primary function of the headstock in a lather machine?
1. To provide support for cutting tools during operations
2. To adjust the feed mechanism for thread cutting
3. To control the movement of the carriage and tailstock
4. To hold and rotate the workpiece at different speeds
Show Answer
Answer: 4
88. Which of the following is the correct rule when selecting a grinding wheel?
1. Close structure for ductile and soft material
2. Soft wheel for hard metal and hard wheel for soft metal
3. Hard wheel for hard metal and soft wheel for soft metal
4. Fine finish needs open structure
Show Answer
Answer: 2
89. Which of the following does not belong to assumptions in calculation EOQ in the basic inventory model?
1. Material cannot be supplied in variable quantities
2. Demand is continuous
3. Delivery of all items are instantaneous
4. Lead time is constant
Show Answer
Answer: 1
90. Which of the following is the primary element that supports the workpiece in centreless grinding?
1. Work rest blade
2. Stationary table
3. Work test blade
4. Pressure roller blade
Show Answer
Answer: 1
91. Which of the following does a cascade refrigeration system use?
1. Two or more refrigerants with different boiling points
2. A single refrigerant in both cycle
3. Only ammonia as a refrigerant
4. Only air as a working fluid
Show Answer
Answer: 1
92. For a thin planar ring of radius ‘r’ mm and thickness ‘t’ mm , its radius of gyration about the polar axis is mm is :
1. r
2. 2r
3. r/2
4. r/t
Show Answer
Answer: 1
93. In gas welding process , gas pressure regulators are employed for _____ .
1. Reducing the pressure of acetylene and oxygen gas from the cylinders to working pressure
2. Igniting the welding torch
3. Increasing the oxygen and acetylene mixture pressure
4. Mixing oxygen and acetylene thoroughly
Show Answer
Answer: 1
94. Which welding process is not classified under arc welding process?
1. Atomic Hydrogen Welding
2. Tungsten Inert Gas Welding
3. Stud Arc Welding
4. Electroslag Welding
Show Answer
Answer: 1
95. If a pump’s theoretical manometric head is 30 metres and its measured head is 27 metres , what is its manometric efficiency ?
1. 75%
2. 85%
3. 90%
4. 80%
Show Answer
Answer: 3
96. Intensity of radiation varies with the:
1. Inverse square of the distance
2. Cube of the distance
3. Fourth power of the distance
4. Square power of the distance
Show Answer
Answer: 1
97. Which cooling method is used in full annealing?
1. Quenching in water
2. Slow cooling inside a furnace
3. Cooling in an oil bath
4. Air cooling
Show Answer
Answer: 2
98. In a modern optical measuring microscope , the ‘cross-wires’ are :
1. Located on the XY stage
2. Located on the surface of the workpiece
3. Located on the objective lens
4. Etched on glass within the eyepiece
Show Answer
Answer: 4
99. The sensing element in the Tomlinson Surface Meter is _____ .
1. The shoe
2. The stylus
3. Rollers
4. Springs
Show Answer
Answer: 2
100. Which of the following is considered a primary output report from Material Requirements Planning?
1. Exception reports
2. Performance control reports
3. Planning reports
4. Planned order schedule
Show Answer
Answer: 4