1. Capacity of material to absorb energy when it is deformed elastically and then, upon unloading, to have this energy recovered.
a. Modulus of toughness b. Modulus of resilience
c. Resilience d. Toughness
2. Crystal structure of γ iron (austenite) is.
a.BCC b. Cubic c.FCC d.HCP
3. Rivets are generally specified by
a. thickness of plate to be riveted b. length and dia of rivet
c. nominal diameter d. all of the above
4. A stud
a. has a head on one end and a nut fitted on the other
b. has a head on one end and other end fits into a tapped hole in the other part to be joined
c. has both the ends threaded
d. requires locking nuts.
5. Velocity potential exists for
a. All 3-D flow situation b. Flow of perfect fluid c. All irrotational flows d. Steady irrrotational flow
6. The velocity profile in the turbulent zone of a turbulent boundary is
a. Parabolic profile b. Cubic profile c. Linear profile d. Logarithmic profile
7. Flow separation is caused by
a. Reduction of pressure to vapour pressure b. A negative pressure gradient
c. A positive pressure gradient d. The boundary layer thickness reducing to zero
8. In case of fully developed pipe flow through tubes
a. Darcy’s friction factor is four times the skin friction coefficient
b. Darcy’s friction factor and the skin friction coefficient are same
c. Darcy’s friction factor is double the skin friction coefficient
d. Darcy’s friction factor is smaller than the skin friction coefficient
9. What are the reasons for reduction of tool life in a machining operation?
1. Temperature rise of cutting edge
2. Chipping of tool edge due to mechanical impact
3. Gradual wear at tool point
4. Increase in feed of cut at constant cutting force
Select the correct answer using the code given below:
a. l, 2 and 3 b. 2, 3 and 4 c. 1, 3 and 4 d. 1, 2 and 4
10. Slip gauges are used to measure
a. strain b. stress c. temp d. length
11.In metrology symbol inverted delta ( ∇ ) is used to represent
a. flatness b. surface roughness c. tolerance grade d. triangular thread profile
12. Out of various microstructures that may be produce for a given steel alloy , which one is hardest and
strongest
a. Bainite b. Martensite c. Spheroidite d. Pearlite
13.Which is false statement about case hardening. Case hardening is done by
a. Electroplating b. Induction hardening c. Cyaniding d. Nitriding
14.For a rectangular cross section beam of area A subjected to a normal force F the maximum shearing stress induced will be
a. F/A b. 2F/A c. F/2A d. 3F/2A
15. Rankin’s theory of failure is applicable for following type of materials
a. brittle b. ductile c. elastic d. plastic
16. Which of the following discipline provides the study of relative motion between the parts of machine?
a. dynamics b. kinetics c. statics d. kinematics
17. A universal joint is an example of
a. higher pair b. lower pair c. rolling pair d. turning pair
18. Resilience of a material is important when it is subjected to
a. combined loading b. fatigue c. shock loading d. thermal stress
19. If a load W is applied instantaneously on a bar of cross section A , then the stress induced in the bar in the worst case will be
a. W/A b. W/2A c. 2 x W/ (A x a factor greater than unity) d. 2 x W/A
20. The fatigue life of a part can be improved by
a. electroplating b. polishing c. coating d. shot peening
21. Bourdon tubes are use to measure
a. volume flow rate b. velocity of liquid passing through it
c. pressure d. Moisture content
22. Stress concentration in cyclic loading is more serious in
a. ductile materials b. brittle materials c. equally serious in both cases d. unpredictable
23. The no. of links in pantograph mechanism is equal to
a. 3 b. 4 c. 5 d. 6
24.The notch angle of the Izod impact test specimen is
a. 10 b. 45 c. 15 d. 30
25. Yield point in fatigue loading as compared to static loading is
a. same b. higher c. lower d. depends on other factors
26. Shear stress theory is applicable for
a. ductile materials b. brittle materials c. elastic materials d. all of the above
27. Silver based solder is used for
a. brazing b. flaring c. soft soldering d. fusion welding
28. Creep in belt is due to
a. material of belt b. larger size of driver pulley
c. uneven extensions and contractions due to varying tension d. expansion of belt
29. The horse power transmitted by a belt is depend upon
a. tension on tight side of belt and tension on slack side of belt b. radius of pulley
c. speed of pulley d. all of the above
30. To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use
a. crown gear b. spiral gear c. bevel gear d. worm gear
31.Gear box is used to
a. to produce torque b. for speed reduction
c. to obtain variable speeds d. to damp out vibration
32. A fluid is substance that
a. Always expands until it fills a container
b. Is practically incompressible
c. Cannot withstand any shear force
d. Cannot remain at rest under the action of any shear force
33. Newton’s law of viscosity relates
a. Pressure, velocity and viscosity
b. Shear stress and rate of angular deformation in a fluid
c. Shear stress, temperature, viscosity and velocity
d. Pressure, viscosity and rate of angular deformation
34. The bulk modulus of elasticity
a. Is independent of temperature
b. Increases with pressure
c. Has the dimension of 1/P
d. Is larger when the fluid is more compressible
35. Largest change of input quantity for which there is no output of instrument is called
a. Threshold b. Dead Zone c. Hysteresis d. Backlash
36. If two materials are connected an external circuit in such a way that a current is drawn, the emf may be altered slightly owing to phenomenon called
a. Seebeck effect b. Peltier effect c. Thermoelectric effect d. Thomson effect
37. If the spring is cut down in two spring the stiffness of cut springs will be
a. half b. same c. double d. un predictable
38. The normal stress is the same in all direction at a point in a fluid :
a. Only when fluid is frictionless
b. Only when fluid is frictionless and incompressible
c. In a liquid at rest
d. When a fluid is at rest, regardless of its nature
39. The line of action of buoyancy force acts trough
a. Centre of gravity of any submerged body
b. Centroid of the volume of any floating body
c. Centroid of the displaced volume of fluid
d. Centroid of the volume of fluid vertically above the body
40. For stable equilibrium of floating bodies, the centre of gravity has to:
a. Be always below the centre of buoyancy
b. Be always above the centre of buoyancy
c. Be always above the metacentre
d. Be always below the metacentre
41. Spring index is
a. load require to produce unit deflection b. its capacity of storing energy
c. indication of quality of spring d. ratio of coil diameter to wire diameter
42. A streamline is a curve
a. Drawn normal to the velocity vector at any point
b. Such that stream lines divides the passage into equal number of parts
c. Which is along the path of particle
d. Tangent to which is in the direction of velocity vector at every point
43. Streamline, pathline and streakline are identical when
a. The flow is uniform
b. The flow is steady
c. The flow velocities do not changes steadily with time
d. The flow is neither steady nor uniform
44. The holes in plates for riveting purpose should be made by
a. punching and reaming b. drilling
c. any of the above two d. depends on location and actual application
45. Peaucellier mechanism has
a. 8 links b.6 links c.4links d. 12 links
46. The no. of instantaneous centres for the mechanism of n links is
a. n b. n(n-1)/2 c. n-1 d. n(n-1)
47. The material acceleration is zero for a
a. Steady flow b. Steady and uniform flow
c. Unsteady and uniform flow d. Unsteady and non-uniform flow
48. A flow field satisfying ∇.V ⃗=0 as the continuity represent always a
a. Steady and uniform flow b. Unsteady and non-uniform flow
c. Steady and incompressible flow d. Incompressible flow
49. The Euler’s equation of motion
a. Statement of conservation of momentum for the flow of inviscid fluid
b. Statement of conservation of momentum for a real fluid
c. Is preliminary step to derive the Bernoulli’s equation
d. Is a statement of energy balance
50. The repeating variable in a dimensional analysis should
a. Have at least one variable containing all the fundamental dimensions
b. Be equal in number to that of the fundamental dimensions involved in the problem variables
c. Include the dependent variable
d. None of these
Answers:
1.c 2.c 3.c 4.c 5.c 6.c 7.c 8.a 9.a 10.d
11.b 12.b 13.a 14.c 15.a 16.d 17.b 18.c 19.d 20.d 21.c 22.a 23.b 24.b 25.c 26.a 27.a 28.c 29.d 30.d 31.c 32.d 33.b 34.b 35.b 36.b 37.c 38.d 39.c 40.d 41.d 42.d 43.b 44.b 45.a 46.b 47.b 48.d 49.a 50.b
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