PU CET PG 2019 Question Paper M.E.Mechanical Engg. _Manufacturing Technology_

M.E.Mechanical Engg. (Manufacturing Technology)

1 If the inverse of a matrix is equal to its transpose, then the type of the matrix is
A) Skew Hermitian
B) Skew symmetric
C) Orthogonal
D) Hermitian

2 i ¾w
Real part of the complex number is

− i
A) −1
B)

i
C) 1
D)

3 If 150 dice are rolled, how many 5 as outcome are likely?
A) 30
B) 25
C) 33
D) 28

4 Atomic packing factor of fcc crystal structure is
A) 0.54
B) Same as that of bcc
C) 0.68
D) Same as that of hcp

5 Coordination Number (CN) in crystal structures is
A) Number of atoms at corners of the lattice
B) Number of electrons in the innermost shell of the atom
C) Number of equidistant atoms surrounding an atom in the lattice
D) Number of atoms sharing electrons in covalent bond

6 Which of the following is not a point defect?
A) Frenkel
B) Dislocation
C) Schottky
D) Impurity

7 Which of the following material has highest ductility?
A) Lead
B) Gold

C) Copper
D) Tin

8 Stainless steels are “stainless” because they contain high content of
A) Sulphur
B) Zirconium
C) Titanium
D) Chromium

9 Poise is the unit of
A) Density
B) Velocity gradient
C) Kinematic viscosity
D) Dynamic viscosity

10 The resultant hydrostatic force acts at a point known as
A) Centre of pressure
B) Centre of buoyancy
C) Centre of gravity
D) Centre of mass

11 The frictional head loss in turbulent flow through a pipe varies
A) Directly as the average velocity
B) Directly as the square of the average velocity
C) Inversely as the square of the average velocity
D) Inversely as the average velocity

12 The shear stress developed in a lubricating oil of viscosity 0.981 N-s/m2, filled between two
parallel plates 1 cm apart and moving with relative velocity of 2 m/s is
A) 196.2 N/m2
B) 49 N/m2
C) 19.62 N/m2
D) 4.9 N/m2

13 Which of the following is measured by a rotameter?
A) Velocity of fluids
B) Discharge of fluids
C) Viscosity of fluids
D) Density of fluids

14 Dimensional formula for Young’s modulus of elasticity is
A) ML-1T-2
B) MLT-2

C) M-1L-1T-1
D) ML-2T-2

15 The strain energy stored in a body due to external loading, within the elastic limit, is known
as
A) Malleability
B) Ductility
C) Toughness
D) Resilience

16 Stiffness of material may be expressed in terms of
A) Mass density
B) Hardness number
C) Modulus of elasticity
D) Impact strength

17 The strain energy stored in a body of volume ‘V’ with stress ‘σ’ due to gradually applied load
is
A) (σE)/2V
B) (σE2)/2V
C) (σV2)/2E
D) (σ2V)/2E

18 Who postulated the maximum shear strain energy theory?
A) Tresca
B) Rankine
C) Mises – Henky
D) St. Venant

19 Two links, for which the relative motion is combination of sliding and turning nature, form a
A) Sliding pair
B) Lower pair
C) Turning pair
D) Higher pair

20 For simple harmonic motion, the graph between velocity and displacement is
A) Elliptical
B) Linear
C) Circular
D) Hyperbolic

21 In which of the following is Coriolis component encountered?
A) Slider crank mechanism
B) Double slider chain mechanism
C) Quick return mechanism

D) Both (A) and (C)

22 The centre of gravity of the coupler link in a four-bar mechanism would experience
A) No acceleration
B) Only linear acceleration
C) Only angular acceleration
D) Both linear and angular acceleration

23 Critical damping depends upon
A) Stiffness and amplitude
B) Mass and frequency of system
C) Mass and stiffness
D) Stiffness and viscosity of medium

24 Fourier analysis as a method of describing an arbitrary function by its
A) Mean amplitude
B) Frequency components
C) Phase lag
D) Rectification

25 The molecular kinetic energy of a gas is proportional to its absolute temperature as
A) T
B) √T
C) T3/2
D) T2

26 Which of the following thermodynamic cycle is used in steam engines?
A) Carnot
B) Bell-Coleman
C) Rankine
D) Brayton

27 For an adiabatic process, if volume is decreased then which of the following takes place?
A) Heat conduction
B) Increase in temperature and decrease in pressure
C) Decrease in temperature and pressure
D) Increase in temperature and pressure

28 The internal energy of a perfect gas does not change during
A) Adiabatic process
B) Isobaric process
C) Isothermal process
D) Isochoric process

29 If we heat wet steam at constant temperature, then which of the following is constant?
A) Pressure
B) Specific enthalpy

C) Specific volume
D) Entropy

30 The smallest change in the value of the input variable being measured , that will cause a
change in the output signal of the instrument is called
A) Hysteresis
B) Drift
C) Resolution
D) Threshold

31 Thermistors, used for temperature measurement, are made of
A) Polymers
B) Semiconductors
C) Superconductors
D) None of the above

32 An orifice meter, used for flow measurement, is a type of
A) Variable area meter
B) Variable head meter
C) Linear resistance flow meter
D) Variable viscosity meter

33 Dynamometers are used for measurement of
A) Motion
B) Proximity
C) Power
D) Dynamic measurements

34 A J-type thermocouple is made of
A) Platinum-Constantan
B) Iron-Constantan
C) Iron-Alumel
D) Copper-Constantan

35 Chills are used in casting moulds to
A) Achieve directional solidification
B) Reduce possibility of blow holes
C) Reduce the freezing line
D) Increase the smoothness of cast surface

36 Misrun is a casting defect which occurs due to
A) Very high pouring temperature of metal
B) Insufficient fluidity of the molten metal
C) Absorption of gases by the liquid metal
D) Improper alignment of the moulds

37 The welding process using flux in the form of granules is

A) Gas welding
B) DC arc welding
C) Submerged arc welding
D) Plasma arc welding

38 Cold working of the metals is carried out
A) Below the recrystallisation temperature
B) At the recrystallisation temperature
C) Above the recrystallisation temperature
D) Working temperature depends upon the physical conditions of the workpiece

39 Spot welding, projection welding and seam welding belong to the category to
A) Arc welding
B) Thermit welding
C) Forge welding
D) Electric resistance welding

40 Which of the following processes is most commonly used for forging of bolt heads of
hexagonal shape?
A) Closed die drop forging
B) Open die upset forging
C) Closed die press forging
D) Open die progressive forging

41 In metal casting, compensation for shrinkage is provided by
A) Oversize pattern
B) Properly placed risers
C) Promoting directional solidification
D) Chills

42 In press operation, the size of the blank depends upon
A) Size of punch
B) Size of die
C) Mean size of punch and die
D) Die size and clearance

43 Which of the following is not orthogonal cutting process?
A) Sawing
B) Broaching
C) Slotting
D) Milling

44 During turning, thrust force will increase with the increase in
A) Side cutting edge angle
B) Tool nose radius
C) Rake angle

D) None of the above affects thrust force

45 In a single point turning operation with cemented carbide and steel combination, Taylor
exponent is 0.25. If the cutting speed is halved, the tool life will become
A) Half
B) Double
C) Four times
D) Sixteen times

46 Factor of safety for fatigue loading is expressed as ratio of
A) Yield strength to working stress
B) Ultimate strength to design stress
C) Endurance limit to allowable stress
D) Yield strength to ultimate strength

47 To ensure self-locking in a screw jack, it is essential that helix angle is
A) Larger than friction angle
B) Smaller than friction angle
C) Equal to friction angle
D) None of the above

48 In the Lewis equation, the working stress depends upon
A) Material of the tooth and pitch line velocity
B) Pitch line velocity and load conditions
C) Load conditions and material of the tooth
D) Pitch line velocity, Load conditions and material of the tooth

49 Riveted joints are designed on the basis of
A) Thickness of plates
B) Rivet length
C) Rivet diameter
D) Hardness of plate material

50 Splined shafts are used for
A) Impact loads
B) Axial movement of hub on shaft
C) Absorbing vibrations
D) High bending stress

51 Which of the following is a trapezoidal thread?
A) Acme
B) Square
C) Buttress
D) U-threads

52 The rated life of a bearing varies

A) Directly as load
B) Inversely as square of load
C) Inversely as cube of load
D) Directly as square of load

53 In the assembly of shaft, pulley and key
A) Pulley is designed as weakest
B) Key is designed as weakest
C) Key is designed as strongest
D) All are designed for equal strength

54 A transmission shaft subjected to bending loads must be designed on the basis of
A) Maximum normal stress theory
B) Maximum shear stress theory
C) Both (A) and (B)
D) Fatigue strength

55 Which of the following components is not part of pneumatic system power supplies?
A) Motor
B) Pressure relief valve
C) Filter
D) Accumulator

56 A pilot operated directional control valve in pneumatic actuation systems is operated by
A) Pressurized air
B) Manually
C) Spring
D) None of the above

57 The graphical symbol for a 4/2 directional control valve consists of
A) 4 squares
B) 2 squares
C) 3 squares
D) 8 squares

58 Terms such as ‘spool type’ and ‘poppet type’ refer to which of the following components in
fluid power systems
A) DC valves
B) Linear cylinders
C) Power supplies
D) Rotary cylinders

59 In automobiles, the distributor is
A) A system for distributing load on the four wheels
B) A rotary switch that connects the ignition coil to various spark plugs
C) A system that connects the master brake cylinder to wheel brake cylinders
D) A section of the drivetrain

60 A low air/fuel ratio is what type of mixture?
A) Lean
B) Rich
C) Poor
D) Fat

61 In CAD, wire-frame modeling is used in
A) 1-D modeling
B) 2-D modeling
C) 3-D modeling
D) 4-D modeling

62 In solid modeling, models are constructed using simple 3-D shapes called
A) Basic Solids
B) 3-D Solids
C) Primitives
D) Cuboids

63 The UCS icon represents the intersection of
A) X-axis and Y-axis
B) X-axis, Y-axis and Z-axis
C) Y-axis and Z-axis
D) X-axis and Z-axis

64 The two most widely used schemes to create solid models in CAD are CSG and
A) s-rep
B) p-rep
C) 3-rep
D) b-rep

65 CAD and CAM are linked through
A) A common database
B) NC tape programming
C) Automation
D) Testing and analysis

66 A geometric model that shows all the edges of an object is called
A) Surface model
B) Solid model
C) Wire-frame model
D) 3-D model

67 NC contouring is an example of
A) Continuous path positioning

B) Point-to-point positioning
C) Absolute positioning
D) Incremental positioning

68 In NC programming, G02 refers to
A) Incremental dimensioning
B) Circular interpolation in counter-clockwise direction
C) Absolute dimensioning
D) Circular interpolation in clockwise direction

69 Decimal number 10 is equal to binary number
A) 1110
B) 1010
C) 1000
D) 1100

70 The full form of PROM is
A) Processor Read Only Memory
B) Programmable Read Only Memory
C) Programmable Register Only Memory
D) Processor Register Only Memory

71 RPY in robotics refers to
A) Manipulator configuration
B) Wrist configuration
C) Control algorithm
D) Special tool

72 Which type or types of actuators are used for actuating robot joints?
A) Electric actuators only
B) Hydraulic actuators only
C) Pneumatic actuators only
D) All of the above

73 Which type of gripper is suitable for handling flat glass sheets?
A) Permanent Magnetic type
B) Mechanical fingers
C) Vacuum cup
D) Electromagnet type

74 Servomotors are dc motors having
A) Encoders
B) Thermistors
C) Anemometer
D) Dynamometers

75 The maximum torque that can be applied to a powered motor without causing shaft
rotation is called
A) Maximum torque
B) Stationary torque
C) Threshold torque
D) Holding torque

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