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13th August 2014, 01:12 PM
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Join Date: Apr 2013
Re: MT previous years question paper

This is the HAL Management trainee previous years question paper:

HAL Management trainee previous years question paper

1. A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a
mass of 1000kg. The force required on plunger is nearly equal to
a) 100N b) 1000N c) 10000N d) 1ON Ans.
2. If the stream function is given by Ψ= 3xy, then the velocity at a point (2, 3) will be
a) 7.21 unit b) 18 unit c)10.82 unit d)54unit Ans.
3. The correct sequence of the centrifugal, pump components through which the fluid flows
is
a) Impeller, Suction pipe, Foot valve and strainer, Delivery pipe b) Foot valve and strainer, Suction pipe, Impeller, Deliverypipe c) Impeller, Suction pipe,Delivery pipe,Foot valve and strainer d) Suction pipe, Delivery pipe, Impeller,Foot valve and strainer Ans.
4. The relation p = constant, where y is the ratio of the specific heats of ideal gas, is
applicable to
a) Any adiabatic process b)Only reversible adiabatic process c) Only irreversible adiabatic process d) Only isothermal process Ans.
5. Across a normal shock
a) static pressure and the static temperature rise b) entropy remains constant



c) velocity and static pressure decrease d) density and temperature decrease Ans.
6. A necessary precaution in selection of pumps for parallel operations is that
a) H-Q characteristics of both should be identical b) Both pumps should be centrifugal type c) Both pumps should be identical d) There should not be change from positive to negative slope In H-Q curve Ans.
7. A metallic cube of side 10 cm, density 6.8 gm/cc is floating in liquid mercury (density
13.6gm/cc), with 5 cm height of cube exposed above the mercury level. Water (density 1
gm/cc) is filled over this, to submerge the cube fully. The new height of cube exposed above
mercury level is
a) 4.6 cm b)5.4cm c) 5.0 cm d)5.8cm Ans.
8. The pressure drop for a relatively low Reynolds number flow in a 600 mm, 30 m long
pipeline is 7OkPa. What is the wall shear stress?
a) 0 Pa b)1400 Pa c) 700 Pa d) 350 Pa Ans. 9. The radiative heat transfer rate per unit area (W/m2) between two plane parallel grey
surfaces (emissivity 0.9) maintained at 400 K and 300 K is (Stefan Boltzmann constant σ =
5.67 x 10 W/m2k4)
a) 1020 b)464 c)812 d)567 Ans.
10. At the eye tip of a centrifugal impeller, blade velocity is 200 m/s while the uniform axial
velocity at the inlet is 150 m/s. If the sonic velocity is 300 m/s, then the inlet Mach number of
the flow will be



a)0.75 b) 0.66 c) 0.90 d)0.83 Ans.
11. The transition Reynolds number for flow over a flat plate is 5* 105. What is the distance
from the leading edge at which transition will occur for flow of water with a uniform velocity
of 1 m/s? (For water. the kinematic viscosity, v = 0.86* 10-6 m2/s)
a) 0.43m b) 1m c)43m d)103m Ans.
12. For a reciprocating water pump having cylinder dia d and crank radius r, if W is the
weight of water lifted, the coefficient of discharge is
a) 2 b) 2 2 c) 2 d) 2 Ans. 13. Both free vortex and forced vortex can be expressed mathematically in terms of
tangential velocity V at the corresponding radius r. Choose the correct combination
Free vortex Forced vortex
a) V r xconst. Vr= const. b)V2x r = const. V = r x const. c)V x r = const. V2= r x const. d) V x r= const. V =r x const. Ans.
14. A bucket of water is hanging from a spring balance. An iron piece is suspended into water
without touching sides of bucket from another support. The spring balance reading will
a)Remain same b)Decrease c) Increase d) Increase/decrease depending on depth of immersion Ans.



15. A single-stage impulse turbine with a diameter of 120 cm runs at 3000 rpm. If the blade
speed ratio is 0.42 then, the inlet velocity of steam will be
a) 79m/s b) 188m/s c) 450m/s d) 900m/s Ans. 16. The critical point and triple point data for water are, Tc = 374°C, Pc = 22.1 Mpa, TT =
0.01°C. PT = 0.6 kPa Indicate the phase change that will occur in following cases,
(i) ice at 0.5 kPa is heated isobarically
(ii) Water vapour at 400°C is compressed isothermally
a)(i)alongAB. (ii) alongCD b)(i)alongCD.(ii)along AB c) (i) alongOD.(ii) along PR d) (i) along RD.(ii)alongOR Ans.
17. The ratio of specific heats of a gas is 1.4 and the value of specific heat at constant
pressure is 7.0 cal/mole° C. The difference between specific heat at constant pressure and
specific heat at constant volume will be (in cal/mole° C)
a) 1.4 b) 1.7 c) 5.0 d) 2.0 Ans.
18. The coefficient of linear expansion of a solid is L. The volume V of a cube of this solid on
being heated by 1° C will change by a)VL b)3VL c)3L d)VL/3



Ans. 19. Two springs of equal length but having stiffness of 10 N/mm and 15 N/mm support a
mass of 2 tonnes in series. Find the frequency of vibration
a)12 √3Hz b)12 √10Hz c)12 √15 Hz d)12 √2Hz Ans. 20. Ratio of pitch circle diameter in millimeters to the number of teeth, is known as
a) Module b) Circular pitch c) Diametral pitch d) Clearance Ans.
21. Two particles with masses in the ratio 1:4 are moving with equal kinetic energies. The
magnitude of their linear momentums will conform to the ratio
a)1:8 b) 1 :√2 c) √2:1 d)1:2 Ans.
22. Which of the following stresses are associated with the tightening of a nut on a stud?
1. Tensile stresses due to stretching of stud
2. Bending stresses of stud
3. Transverse shear stresses across threads
4. Torsional shear stresses in threads due to frictional resistance
Select the correct answer using the codes given below:
a) 1,2 and 3 b) 1,2and 4 c) 1,3 and 4 d) 2,3 and 4 Ans. 23. A flywheel weighs kg and has a radius of gyration of 100 cm. It is given a spin of 100
rpm about its horizontal axis. The whole assembly is rotating about a vertical axis at 6
rad/sec. The gyroscopic couple experienced will be
a)2,000 kgm b) 19,620 kgm c)20,000kgm d) 1,962kgm



Ans.
24. Determine the diameter of solid shaft which will transmit 90kw at 160 rpm, if the shear
stress in the shaft is limited to 60 N/mm2
a)50mm b)6Omm c)77mm d)7Omm Ans.
25. A roller of weight W is rolled over the wooden block shown in the given figure. The pull
required just to cause the said motion is
a) W/2 b)√3W c) W d) 2 W Ans. 26. For one-dimensional isentropic flow in. a diverging passage, if the initial static pressure
is P1, and the initial Mach number is M1 (M1 <1), then for the downstream flow
a) M2< M1; P2<p1 b)M2>M1; P2>p1 c)M2<M1; P2>p1 d)M2>M1; P2<p1 Ans.
27. In a furnace made of bricks,
Inside heat transfer coefficient 35 W/m2K
Outside heat transfer coefficient =25 W/m2K
Thermal conductivity of bricks (15 cm thick) = 0.15 W/mK
The overall heat transfer coefficient (in W/m2K) will be closer to the
a)Insideheat transfer coefficient



b) Outside heat transfer coefficient c) Thermal conductivity of bricks d) Heat transfer coefficient based on the thermal conductivityof the bricks alone. Ans.
28. Two systems have the same wet bulb temperature of 200 C. System ‘A’ has Dry bulb
temperature of 25°C since it has a relative humidity of 65%. System ‘B’ has a relative
humidity of 30%. What will be its dry bulb temperature
a) 33°C b) 25°C c)27°C d) 22°C Ans.
29. Four rods with different radii r and length l are connected to two reservoirs at different
temperature. Which one of them will conduct most heat?
a)r=2cm&l=2m b)r=lcm&l=1m c)r=2cm&l=½m d)r=½cm&l= ½m Ans. 30. A 1000 kg vehicle travelling at 80 m/s impacts a plunger attached to a piston-cylinder
arrangement. If all of the energy of the vehicle is absorbed by the 20 kg of liquid contained in
the cylinder, what is the maximum temperature rise of the liquid? (The specific heat of the
liquid (I is 4.0 kJ/kg.°C) a)55°C b) 40°C c)45°C d)50°C Ans. 31. In the Van der Waal’s gas equation (ƿ+ )(v – b) = RT to constant ‘a’ is introduced to
compensate for
a) Reductioninspecific volume b) Inter-molecular forces c) Reduction in specific heat d) All of the above Ans.
32. The centrifugal tension in belts



a) Increase power transmission upto certain speed and then decreases b) Increases power transmission c) Does not affectpowertransmission d) Reduces power transmission Ans. 33. In nodular iron, graphite is in the form of a) Spheroids b) Nodular carbide c) Flakes d) Cementite Ans. 34. Corrosion resistance of steel increases by addition of a) Vanadium, aluminium b) Sulpher, phosphorus, lead c) Chromium and nickel d) Tugsten, molybdenum, vanadium, chromium Ans. 35. Phenomenon of progressive extension of material with time at constant load is called a) Plasticity b) Creep c) Yield d) Breaking Ans. 36. Rivets are made of a) Soft material b) Ductile material c) Hard material d) Brittle material Ans. 37. Addition of copper to aluminium results in a) Precipitation hardening system b) Corrosion resistance c) Grain refinement d) High machinability Ans.
38. A Hooke’s joint is used to connect two a) Coplanar & Nonparallel shafts b) Non coplanar & Nonparallel shafts c) Coplanar & Parallelshafts d) All the 3 above



Ans. 39. In a hardness test, L is load in kg, D is diameter of ball in mm and d is diameter of
indentation in mm. Brincll Hardness Number is expressed by the equation a) BIIN = ( − 2− 2 b)BIIN = 2 ( − 2− 2
c) BIIN = ( − 2− 2 d)BIIN = 2 ( − 2− 2 Ans.
40. Circumferential anti longitudinal strains in the cylindrical boiler under internal steam
pressure arc Є1 and Є2 respectively. Change in the volume of the boiler cylinder per unit
volume will be
a) Є12Є2 b) Є1Є22 c) 2Є1+ Є2 d) Є1+2Є2 Ans. 41. An overhung beam ABC of length 4m is supported at A and B 3m apart. It is loaded with
UDL of 5 kN/m along its entire length. Find the value of load ‘P’ at C such that the reactions at
A and B are equal and opposite.
a)P10 kN b) P30kN c)P20kN d) P25kN Ans. 42. If two gears have moment of inertias as I1 and 12 respectively and mesh with a speed
ratio ω2 / ω1 = n, then equivalent moment of inertia of both gears referred to first one is
a)n2I1+I2 b)I1+ nI2 c)nI1+ I2 d)I1+n2I2 Ans.



43. A uniform circular ring of mass M and radius r is rotating with an angular speed ω about
an axis passing through its center and perpendicular to the plane of the ring. Two identical
beads, each of mass m, somehow get attached at two diametrically opposite points. The
rotational speed of the ring will become a) +2 b) + c) 2+2 d) ω Ans. 44. An electric lift is moving downward with an acceleration of g/3. the vertical force
between a passenger in the lift and its floor is equal to
a)3/4 of the passenger’s weight b) 2/3 of thepassenger’s weight c) Passenger’s weight d) 4/3 of thepassenger’s weight Ans. 45. A body of mass 10kg moving with a velocity of 1 m/s is acted upon by a force of 50 N for
two seconds. The final velocity of the body is
a) 22 m/sec b) 1m/sec c)√21m/sec d) 11 m/sec Ans.
46. Proof resilience may be defined as
a) Work done in strainingthe material b) Max. strain energy that can be storedin a material per unit volume c) Max. strain energy that can be storedina material under elastic condition d) Max. load which can be applied to amember Ans. 47. A plane intersects the co-ordinate axes at x = 2/3, y = 1/3, z = 1/2. What is the Miller
index of this plane?
a)(932) b)(432) c)(364) d)(423) Ans.



48. Relationship between modulus of elasticity E, modulus of rigidity G and Poisson’s ratio μ
is
a) G = E/2 (1 +μ) b) G=E (2-μ) c) E= G (1 +μ) d) G=E/1+μ Ans.
49. A bar of Length L, area A and Young’s modulus E is subjected to a pulling force P. The
strain energy stored in the bar is
a) 2 b) 2 2 c) 2 2 d) 2
Ans.
50. What is the expression for crippling load for a column of length L, with one end fixed and
other end free?
a)P = π2EI/4L2 b)P=π2EI/L2 c)P=2π2 EI/L d) 4π2El/L2 Ans.
51. A Mohr’s circle reduces to a point when the body is subjected to
a) Pure shear b) Uniaxial stress only c) Equal & opposite axial stresses on two mutually perpendicular planes, the planes being free of shear. d) Equal axial stresses are on two mutually perpendicular planes, the planesbeing free of shear. Ans.
52. Power screws are used to convert



a) Linear motion torotary motion b) None of these c) Both a & b d) Rotary motion intotranslatorymotion Ans. 53. Following gases are used in tungsten inert gas welding
a) CO2andll2 b)Argon and neon c) Argon and helium d) Helium and neon Ans.
54. The force required to punch a 25 mm hole in a mild steel plate 10 mm thick, when
ultimate shear stress of the plate is 500 N/mm2 will be nearly
a)78kN b) 393kN c) 98kN d) 158kN Ans.
55. One-half length of 50mm diameter steel rod is solid while the remaining half is hollow
having a bore of 5 mm. The rod is subjected to equal and opposite torque at its ends. If the
maximum shear stress in solid portion is τ, the maximum shear stress in the hollow portion
is: a)15 16 b) τ c)43
d)16 15 Ans. 56. Two metal plates of thickness ‘t’ & width ‘w’ arc joined by a fillet weld of 450 as shown in
fig. When subjected to a pulling force ‘F’ the stress induced in the weld will be
a) b) 45 c) 45 d)2
Ans.



57. Ring rolling is used
a) To decrease the thickness and increase diameter b) To increase the thickness of a ring c) For producing a seamless tube d) For producing large cylinder Ans.
58. A bar of 20mm dia is tested in tension. It is observed that when a load of 38KN is applied
the extension measured over a gauge length of 200mm is 0.12mm and contraction in
diameter is 0.0036mm. Find the Poisson’s ratio
a) 0.2 b) 0.3 c) 0.25 d) 0.33 Ans.
59. A perfect frame has N joints. The number of members should not be less than
a) 2N-1 b) 2N-2 c) 2N-3 d) 2N-5 Ans.
60. A cantilever beam of rectangular cross section is subjected to load at free end. If the
depth of the beam is doubled and load is halved, deflection of the free end as compared to
original will be
a) 1/2 b) 1/8 c) 2 d) 1/16 Ans. 61. The kinematic planar chain Shown in the given figure is a



a) Structure b) Mechanism with 2 degreeof freedom c) Mechanism with 1degree of freedom d) Mechanism with more than 2 degree offreedom Ans.
62. The machining process in which the work piece is dissolved into an electrolyte solution
is called
a) Electro-chemical machining b) Ultrasonic machining c) Electro-discharge machining d) Laser machining Ans.
63. In the metal forming process, the stresses encountered are
a) Greater than yield strength but less than ultimate strength b) Less than yield strength of the material c) Greater than the ultimate strength of the material d) Less than the elastic limit Ans.
64. A grinding wheel is specified as 49 A 26 36 M 7 V 24. The number 36 stands for
a) Structure b) Grade c) Grit size d) Bond Ans.



65. In a fluid machinery, the relationship between saturation temperature and pressure
decides the process of
a) Flow separation b) Cavitation c) Turbulent mixing d) Water hammer Ans,.
66. Anodising is
a) A process of coating of zinc by hot dipping b) A zinc diffusion process c) A process used for makingthin phosphatecoatings on steel to act as a base orprimerfor enamels and paints d) An oxidizing process used for aluminiumand magnesium articles Ans.
67. The process layout is best suited where
a) Automation is employed b) Mass production is envisaged c) A few number of non-standardized unitsare to be produced d) Machines are arranged according tosequence of operation Ans. 68. The blank size of the gear of 3 mm module and 40 number of teeth is
a) 120mm b) 123 mm c)126 mm d)129 mm Ans.
69. A bag contains 7 white, 6 red and 9 black balls. Two balls are drawn at random. The
probability that both the balls will be black is a)111 b)12 77 c)577 d)977 Ans.



70. Match list—I (Machining Process) with list—II (Associated medium) and select the
correct answer using the codes given below the lists
List — I (Machining Process) List— II (Associated Medium)
A) Ultrasonic machining 1) kerosene
B) EDM 2) Abrasive slurry
C) ECM 3) Vacuum
D) FBM 4) Salt solution
A B C D a) 2 1 4 3 b) 2 3 4 1 c) 4 1 2 3 d) 4 3 2 1 Ans.
71. The rake angle of a cutting tool is 150, shear angle 45° and cutting velocity 35 m/min.
What is the velocity of chip along the tool face?
a)25.3m/min b)27.3m/min c)28.5m/min d)23.5m/min Ans.
72. The value of the determinant given below is 1 1 1 1+a 1 1 1 1 1 1 1 1 1−b 1 1 1+c a)–abc b) abc c) 1 d) 0 Ans. 73. The locus of the point Z satisfying the condition arg −+
= is a) x2-y2-2√3y = 0 b) x2+ y2= 1 c) x2-y2-2√3y-1 = 0 d) x2+ y2-2√3y-1 = 0 Ans.



74. In a simple micrometer with screw pitch 0.5 mm and divisions on thimble 50, the reading
corresponding to 5 divisions on barrel and 12 divisions on thimble is
a) 2.620mm b)2.512 mm c) 5.120 mm d) 5.012mm Ans.
75. It is required to cut screw threads of 2mm pitch on a lathe. The lead screw has a pitch of 6
mm. If the spindle speed is 60 rpm, then the speed of the lead screw will be
a) 10 rpm b) 20 rpm c) 120 rpm d) 180 rpm Ans. 76. If u = log (tan x + tan y), then sin 2x +sin 2y is
a)1 b)-2 c)2 d)-1 Ans. 77. The value of λ for which the equations 2λx — 3y + λ — 3 = 0, 3x— 2y + 1 = 0 and 4x — λy
+2 = 0 are consistent is
a)3or 6 b) 1or3 c) 2 or 6 d) 2 or3 Ans.
78. 1f + + = 0 and ∣ ∣= 3, ∣ ∣= 5, ∣ ∣= 7, then the angle between and is
a) 450 b)300 c) 900 d) 60° Ans.
79. The image of the point P(1,3,4) in the plane 2x — y + z -3 is
a)(-3,5,-2) b)(-3,-5,2) c)(3,-5,-2) d)(-3,5,2) Ans.
80. Find a particular integral of the differential equation (D2 – 4D + 3)y = sin3xcos2x a)120(10cos5x–11sin5x) + 1 884(sin x–2cosx)
b) 1 884(10cos5x–11sin5x) +120(sin x + 2cosx)
c)120(10cos5x–11sin5x)+ 1 884(sin x + 2cosx)
d) 1 884(10cos5x + 11sin5x) +120(sin x + 2cosx)


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