The extending the polymer chain by successive addition of monomers units is called
A. Propagation
B. Termination
C. Both A and B
D. None of these
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Dacron is an example of
A. polyamides
B. polypropene's
C. polyacrylnitrfle
D. polyesters
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If Reynolds number is greater than 1, then the
A. Viscous force is larger than the inertia force
B. inertia force is larger than the viscous force
C. inertia force is larger than the surface tension force
D. inertia force is larger than the gravitational force
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Which is the correct (degree) temperature range for spherodized carbide in low carbon steel
A. 750-950°C
B. 950-1150°C
C. 550-750°C
D. None of these
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Which of the following torch angle used in the forehand welding process
A. 30 - 40
B. 40 - 50
C. 50 - 60
D. None of these
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The Nusselt number depends only on the Rayleigh number (product of the Grashof and Prandtl numbers) in the limit of
A. Low Grashof number and low Prandtl number
B. Low Grashof number and high Prandtl number
C. High Grashof number and low Prandtl number
D. High Grashof number and high Prandtl number
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Which of the following has a greater impact on the longitudinal strength of reinforced composites
A. Fiber orientation
B. Fiber strength
C. Fiber length
D. Fiber diameter
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For ferrous drawing, the drawing speed of multiple die machine is
A. 5 m /sec
B. 10 m /sec
C. 20 m /sec
D. 30 m /sec
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For edge dislocation slip plane is
A. parallel to burger vector
B. perpendicular to burger vector
C. at 45° to the burger vector
D. none of these
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Match the items in
Group 1 with units/dimensions in
Group 2 .
Group 1
Group 2
P. Diffusivity
1. Lt-1
Q. Surface tension
2. L-2 t-1
R. Dislocation density
3. JL-2
S. Mass Transfer coefficient
4. J mol-1 .K-1
5. L-2
A. P-3, Q-4, R-2, S-5
B. P-5, Q-3, R-3, S-1
C. P-3, Q-2, R-4, S-1
D. P-2, Q-3, R-5, S-1
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At a particular extrusion ratio, the strength . . . . . . . . along the length of the extruded product from front to back end.
A. Decreases
B. Increases
C. remains constant
D. none of these
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Probability of nucleation throughout the system is . . . . . . . . In heterogeneous nucleation.
A. Similar
B. Irregular
C. Same
D. None of these
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A glass fibre reinforced epoxy composite is made with 60 wt.% unidirectional continuous glass fibres. The elastic moduli of the glass fibre and the epoxy matrix are 72.5 and 2.4 GPa, respectively. What is the elastic modulus of this composite along the fibre direction, in GPa? The densities of glass fibre and epoxy are 2.58 g/cm3 and 1.14 g/cm3 , respectively
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The the equation for thermal conductivity
A. K = X A Δ T
B. K = X Δ T Q A
C. K = A Δ T QX 1
D. None of these
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Example/examples of eutectoid system is/are
A. Ag-Cd, Ag-Ga, Pb-Sn
B. Ag-Cd, Ag-Ga, Al-Mn, Bi-Cd
C. Ag-Cd, Ag-Ga, Al-Mn, Au-Zn, Pb-Sn
D. Ag-Cd, Ag-Ga, Al-Mn, Au-Zn, Cu-Zn, Cu-Sn
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The resistance to compressive deformation increases when length to thickness
A. decreases
B. increases
C. remains constant
D. uncertain
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Hardness of steel increases with the
A. Increase of carbon %
B. Decrease of carbon %
C. By slow cooling
D. None of these
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The motion of edge dislocation inside the materials may be
A. conservative motion
B. nonconservative motion
C. both A and B
D. none of these
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The infinitely long and wide parallel plates A and B are at temperature. Ta and Tb respectively. The energy transferred from relatively hotter plate A to plate B is proportional to
A. Ta - Tb
B. Ta 2 - Tb 2
C. (Ta - Tb ) (Ta 2 + Tb 2 - Ta .Tb )
D. None of the above
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A steel rod was subjected to a fluctuating stress cycle that varied between a maximum of 400 MPa in tension to a minimum of 300 MPa in compression. What is the stress amplitude, in MPa?
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