1. Home
  2. All Previous Year Questions List
S.No Question Option A Option B Option C Option D Answer Solution Comments Status Action
1 Which of the following drawing symbols flatness of a surface c Comments Active
2 What carries away maximum heat energy in a machining process? Coolant Tool Chip Work piece c Comments Active
3 Fixtures are used: For holding and guiding the tool in drilling, reaming or tapping operations For holding the work in milling, grinding, planning or turning operations To check the accuracy of work piece None of the above b A fixture is a production tool that locates and holds the work-piece
A jig is a special device which holds, supports, locates, and also guides the cutting tool during operation.		 Comments Active
4 The usual value of the point angle of a drill is: 70 \(°\) 100 \(°\) 118 \(°\) 130 \(°\) c Comments Active
5 The operation of smoothing and squaring the surface around a hole is known as: Counter sinking Counter boring Trepanning Spot facing d Spot facing is a machining operation for producing a flat seat for bolt head, washer or nut at the opening of drilled hole. Spot facing removes sufficient metal from the surface around a drilled hole to form a true seat for a bolt head or nut. Comments Active
6 Discontinuous chips are formed during machining of : Brittle metals Ductile metals Hard metals Soft metals a Comments Active
7 CLA value is used to indicate: Surface dimension Surface hardness Surface roughness Surface area c Comments Active
8 Most of the oxy-acetylene welding is done with: Neutral flame Oxidizing flame Carburising flame All of these a Comments Active
9 Thermit, used in thermit welding, is a mixture of : Charcoal and iron oxide Charcoal and aluminium Iron oxide and aluminium Charcoal, iron and aluminium c The thermit welding reaction takes place between the metal oxide and aluminium. In this process, fine aluminium particles and metal oxide are blended and ignited by an external heat source. The reaction will proceed according to the following equation:
Metal Oxide + Aluminium → Aluminium Oxide + Metal Heat
Due to the thermit chemical mixture reaction, three products are produced,
Iron - Used as filler rod
Al2O3 - Used as a slag
Heat - Used for the melting of the parent material.		 Comments Active
10 The consumable electrode is used in: Carbon arc welding Submerged arc welding TIG welding MIG welding d Gas metal arc welding (GMAW) or Metal inert gas arc welding (MIG): 
In this process, the arc is formed between a continuous, automatically fed, metallic consumable electrode and welding job in an atmosphere of inert gas, and hence this is called metal inert gas arc welding (MIG) process. Argon, helium, and mixtures of the two can be used as shielding gas.		 Comments Active
11 The welding set up is said to have straight polarity, when: Work is connected to the positive terminal and the electrode holder to the negative terminal. Work is connected to the negative terminal and the electrode holder to the positive terminal. Work is connected to the positive terminal and the electrode holder is earthed Work is connected to the negative terminal and the electrode holder is earthed a Straight polarity: In straight polarity, the electrode is connected to the negative and the work to the positive terminal of the power source.
Reverse Polarity: In reverse polarity, the electrode is connected to the positive and the work to the negative terminal of the power source.		 Comments Active
12 The electrodes used in spot welding have a tip of: Stainless steel Aluminium Copper Brass c Comments Active
13 The purpose of a gate in casting is to: Deliver molten metal into the mould cavity Act as a reservoir for the molten metal Vent out trapped gases Provide shape to the mold cavity a Gate in casting : It is the actual entry point through which liquid metal will enter the cavity at a constant rate. Comments Active
14 A taper provided on the pattern for its easy and clean withdrawal from the mould is known as: Machining allowance Draft allowance Shrinkage allowance Distortion allowance b Draft Allowance: Pattern draft is the taper placed on the pattern surfaces that are parallel to the direction in which the pattern is withdrawn from the mold (that is perpendicular to the parting plane), to allow removal of the pattern without damaging the mould cavity. Comments Active
15 Inconel contains 65% nickel, 15% chromium and 20% iron 68% nickel, 29% copper and 3% other constituents 80% nickel and 20% chromium 80% nickel, 14% chromium and 6% iron. d Comments Active
16 Brass is an alloy of: Copper and zinc Copper and tin Copper, tin and zinc None of these a Comments Active
17 Normalising of steel is done to: Refine the grain structure Remove strains caused by cold working Remove dislocations caused in the internal structure due to hot working all of the above d Comments Active
18 The lower critical point for all steels is: 600 \(℃\) 700 \(℃\) 723 \(℃\) 913 \(℃\) c Comments Active
19 18/8 stainless steel consists of : 18% nickel and 8% chromium 18% chromium and 8% nickel 18% vanadium and 8% chromium 18% nickel and 8% vanadium b Comments Active
20 Vanadium when added to steel: Increases tensile strength Decreases tensile strength Raises critical temperature Lowers critical temperature a Vanadium increases the yield strength and the tensile strength of carbon steels. Small amount of vanadium increases the strength of steels significantly.
It promotes fine grains and elevates coarsening temperature of austenite.
It increases hardenability when dissolved. Vanadium is used to help control the grain size of the steel, keeping it small. The grain size is kept small because the vanadium carbides that form when vanadium is added to a steel block the formation of grains. This blockage prevents the grains from growing to be as large as what they would be without the added vanadium.		 Comments Active
21 The iron are mostly used for the production of pig iron is : Magnetite Haematite Limonite Siderite b Pig iron is produced by smelting of mainly hematite iron ore in blast furnaces.
Pig iron is used as a raw material for iron steel making.		 Comments Active
22 The stiffness is the ability of a material to resist: Deformation under stress Fracture due to high impact loads Externally applied forces with breakdown or yielding None of the above a Comments Active
23 The percentage of carbon in cast iron varies from: 0.1 to 0.5 0.5 to 1 1 to 1.7 1.7 to 4.5 d Comments Active
24 Which of the following property is desirable in parts subjected to shock and impact loads? Strength Stiffness Brittleness Toughness d Toughness: The ability of the material to withstand stress (resist fracture due to high impact loads) without fracture is known as toughness. It is defined as the ability to absorb energy in the plastic state.
Brittleness: The property of a material that produces fractures without any appreciable deformation is known as brittleness. It is the opposite of toughness.
Stiffness: Stiffness of a material is the resistance offered to deformation, below the elastic limit. It is indicated by the slope of the stress-strain curve. A material with a high value of Young’s modulus E is stiffer than the material with the lower value of Young’s modulus. Small values of E indicate flexible materials and a large value of E reflects stiffness and rigidity.
Strength: The strength of a material is its ability to withstand an applied load without failure or plastic deformation.		 Comments Active
25 A bolt of M242 means that: \(×\) The pitch of the thread is 24mm and depth is 2mm Cross-sectional area of the threads is 24mm2 The nominal diameter of bolt is 24mm and pitch is 2mm The effective diameter of bolt is 24mm and there are 2 threads per cm. c Comments Active
26 The included angle for the ISO metric thread is: 29 \(°\) 47.5 \(°\) 55 \(°\) 60 \(°\) d Comments Active
27 In ……… operation, the chip thickness is minimum at the beginning of the cut and reaches maximum when the cut terminates Conventional milling Climb milling Face milling End milling a Up/Conventional milling: The work piece is moving towards the cutter, opposing the cutter direction of rotation. The cutting force is minimum during the beginning of the cut and maximum at the end of the cut. Comments Active
28 According to Indian standard specifications, 100 H6/g5 means that: Tolerance grade for the hole is 6 and for the shaft is 5 Tolerance grade for the shaft is 6 and for the hole is 5 Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7 Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7 a Comments Active
29 A basic hole is one whose: Lower deviation is zero Upper deviation is zero Lower and upper deviations are zero None of these a Comments Active
30 The difference between the upper limit and lower limit of a dimension is called: Nominal size Basic size Actual size Tolerance d Nominal size is the size of a part specified in the drawing as a matter of convenience.
The actual size is the actually measured dimension of the part.
Tolerance is the difference between the upper limit and the lower limit of a dimension.		 Comments Active
31 In order to gain toughness in hardened steel, the process usually adopted is Tempering Annealing Normalizing Spheroidising a Comments Active
32 Which set does not represent the sides of a right angled triangle? 12, 16, 20 9, 5, 6 6, 10, 8 15, 25, 20 b Comments Active
33 Two mating gears of module 5 have 50 and 20 teeth. The distance between their axes is: 350 200 175 140 c M = 5,
T1 = 50,
T2 = 20
D1 = 5 × 50 = 250, ∴ r1 = 125 
D2 = 5 × 20 = 100,  ∴ r2 = 50
∴ Distance between their axes = r1 + r2 = 125 + 50 = 175		 Comments Active
34 The periodic time of one oscillation for a simple pendulum is: 2 \(Ï€\frac{G}{L}\) \(\frac{1}{2Ï€}\frac{G}{L}\) 2 \(Ï€\frac{L}{G}\) \(\frac{1}{2Ï€}\frac{L}{G}\) c Comments Active
35 Carnot cycle consists of Two constant volume and two isentropic processes Two isothermal and two isentropic processes Two constant pressure and two isentropic processes One constant volume, one constant pressure and two isentropic processes b Comments Active
36 The general law for the expansion or compression of gases is: pv = C pv = mRT pvn = C p= C \(V^{Γ}\) c Comments Active
37 The discharge per hour of a double acting reciprocating pump is: 120 L.A.N 2L.A.N \(\frac{L.A.N}{60}\) \(\frac{2L.A.N}{60}\) a Comments Active
38 The discharge through a small rectangular orifice is given by: Q = Cda \(×\) \(×2gh\) Q = Cda \(\frac{2}{3}\) \(×\) \(×h\) Q = \(\frac{C_{d}×a}{2gh}\) Q = \(\frac{3C_{d}×a}{2gh}\) a Comments Active
39 When the mach number is more than 6, the flow is called: Sub-sonic flow Sonic flow Supersonic flow Hypersonic flow d M < 0.8 Sub-sonic flow
0.8 < M <1.3 Trans-sonic flow
M = 1 Sonic flow
1 < M < 5 Super-sonic flow
M > 5 Hypersonic flow		 Comments Active
40 According to Darcy’s formula, the loss of head due to friction in the pipe is: flv2/2gd flv2/gd 3flv2/2gd 4flv2/2gd d Comments Active
41 Reynolds’s number is the ratio of the inertia force to the: Surface tension force Viscous force Gravity force Elastic force b Comments Active
42 The pressure of the liquid flowing through the divergent of a venturimeter Remains constant Increase Decreases Depends upon mass od liquid b
This is done to ensures a rapid converging passage and a gradual diverging passage in the direction of flow to avoid the loss of energy due to separation.
In course of flow through the converging part, the velocity increases in the direction of flow according to the principle of continuity, while the pressure decreases according to Bernoulli’s theorem.
The velocity reaches its maximum value and pressure reaches its minimum value at the throat. Subsequently, a decrease in the velocity and an increase in the pressure take place in course of flow through the divergent part.		 Comments Active
43 According to Bernoulli’s equation for a perfect incompressible fluid flow: Z + p/w + v2/2g = constant Z + p/w - v2/2g = constant Z - p/w + v2/2g = constant Z - p/w - v2/2g = constant a Comments Active
44 The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point is known as: Path line Stream line Steak line Potential line b Streamlines are a family of curves that are instantaneously tangent to the velocity vector of the flow. These show the direction in which a massless fluid element will travel at any point in time. Comments Active
45 When a liquid is flowing through a pipe, the velocity of the liquid is: Maximum at the centre and minimum near the walls Minimum at the centre and maximum near the walls Zero at the centre and maximum near the walls Same at the centre and near the walls a Comments Active
46 The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid is called: Surface tension Compressibility Capillarity Viscosity d Comments Active
47 Moment of inertia of a triangle of base width ‘b’ and height ‘h’ with respect to the centroidal axis parallel to its base is equal to: bh3/12 bh3/18 bh3/24 bh3/36 d Applying parallel axis theorem we get
\(I_{xx}=I_{cc}+A(\frac{h}{3})^{2}\)
\(I_{cc}=I_{xx}-A(\frac{h}{3})^{2}\)
\(\frac{bh^{3}}{12}-\frac{bh}{2}×\frac{h^{2}}{9}=\frac{bh^{3}}{36}\)
\(I_{centroid}=\frac{bh^{3}}{36}\)		 Comments Active
48 Which of the beam develop thermal stresses on heating Simply supported Cantilever Fixed None of these c Comments Active
49 A metal pipe of 1m diameter contains a fluid having a pressure of 1 N/mm2. If the permissible tensile stress in the metal is 20N/mm2, then the thickness of the metal required for making the pipe will be: 5mm 10mm 15mm 25mm d Any cylinder is made by considering its hoop I.e. Circumferential stress
t = \(Σ\) \(\frac{Pd}{2t}\)
T = = = 25mm \(\frac{Pd}{2σ_{t}}\) \(\frac{1000}{4×20}\)		 Comments Active
50 Stress concentration factor is defined as the ratio of Maximum stress to the endurance limit Nominal stress to the endurance limit Maximum stress to the nominal stress Nominal stress of the maximum stress c Comments Active
51 When a hole of diameter ‘d’ is punched in a metal of thickness ‘t’, then the force required to punch a hole is equal to: u \(d.t.τ\) u \(π.d.t.τ\) /4)u \((π\) \(D^{2}.τ\) /4).u \((π\) \(D^{2}\) \(t.τ\) b In punching and blanking, the shearing action on the sheet takes place which will depend on the shear strength of the metal.
Punching force F = Lt Ï„
Where L is Length of the periphery, t = thickness, τ = Ultimate shear strength For circular section L = πd
∴ F = πdtτ		 Comments Active
52 The shaft subjected to bending moment M and twisting moment T simultaneously. The equivalent twisting moment is equal to: \(M^{2}+T^{2}\) M + \(M^{2}+T^{2}\) 1/2 \(( M + M^{2}+T^{2})\) 1/2 \((M^{2}+T^{2})\) a Comments Active
53 What is the stress developed in bending a 10mm diameter steel rod of E = 2105 N/mm2 to 2000mm diameter? \(×\) 500 N/mm2 2000 N/mm2 1000 N/mm2 981 N/mm2 c Diameter of rod (d) = 10 mm, Curvature diameter (D) = 2000 mm, E = 2 × 105 N/mm2
Radius of curvature (R) = = = 1000mm \(\frac{D}{2}\) \(\frac{2000}{2}\)
Y = = 5mm \(\frac{d}{2}\)
= \(\frac{Σ}{Y}\) \(\frac{E}{R}\)
= \(\frac{Σ}{5}\) \(\frac{2×10^{5}}{1000}\)
= 1000 N/mm2 \(Σ\)		 Comments Active
54 In a riveted lap joint, which one is not a failure mode? Tearing failure of plate Bearing failure of plate Shearing failure of plate Tensile failure of rivet d Comments Active
55 The bending moment of a cantilever beam of length l and carrying a gradually varying load from zero at free and w per unit length at the fixed end is …… at the fixed end: wl/2 wl wl2/2 wl2/6 d Comments Active
56 A body is subjected to a direct tensile stress () in one plane. The shear stress is maximum at a section inclined at …… to the normal of the section: \(σ\) 45 to 90 \(°\) \(°\) 45 to 135 \(°\) \(°\) 60 to 150 \(°\) \(°\) 30 to 135 \(°\) \(°\) b Σx = σ,  σy = 0, τxy = 0
Now the relation becomes
Τθ = 1/2 (σx)sin2 \(θ\)
Now the value of shear stress will be maximum for the maximum value of sin 2θ and for θ = 45° and θ = 135° value of sin 2θ will be maximum that is 1 hence shear stress will be maximum on these planes.		 Comments Active
57 When a body is subjected to three mutually perpendicular stresses of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as: Young’s modulus Modulus of rigidity Bulk modulus Poisson’s ratio c The Bulk Modulus (K) is defined as K = \(\frac{Direct stress}{volumetric strain}\) Comments Active
58 A bar of length L meters extends by l mm under a tensile force of P. The strain produced in the bar is: l/L 0.1l/L 0.01l/L 0.001l/L d E = = = 0.001l/L \(\frac{δl}{l}\) \(\frac{l}{L × 1000}\) Comments Active
59 Which of the following is a proper sequence? Proportional limit, elastic limit, yielding, failure Elastic limit, Proportional limit, yielding, failure yielding, proportional limit, elastic limit, failure None of the above a Comments Active
60 Unit of strain is N/mm2 \(mm^{2}\) \(mm\) No unit d Comments Active