TIG welding is preferred for
A. Mild steel
B. Aluminium
C. silver
D. all of these
Select an option to see the answer and solution.
The temperature of the workpiece in metal working depends on
A. the initial temperature of the tools and the material
B. heat generation due to plastic deformation
C. heat generated by friction due to plastic deformation
D. all of these
Select an option to see the answer and solution.
Match following:
Group 1
Group 2
P. Ergun equation
1. Tube flow
Q. Hagen-poiseulle equation
2. overall energy balance
R. Bernoulli equation
3. packed bed
S. Fourier equation
4. Heat flow
A. P-1, Q-3, R-2, S-4
B. P-4, Q-3, R-2, S-1
C. P-3, Q-1, R-4, S-2
D. P-3, P-1, R-2, S-4
Select an option to see the answer and solution.
Thin walled pressure vessels are to be made either from Material A and B. If the applied stress is 1.2 times higher when material A is used and (KIC )A = 0.6(KIC )B (where, KIC denotes plain strain fracture toughness). The ratio of critical crack lengths in material A and B will be
Select an option to see the answer and solution.
How is cooling of the material done is normalizing process
A. Furnace
B. Cooling tower
C. Still air
D. Liquid chamber
Select an option to see the answer and solution.
Which one is true for an opaque body?
A. Transmissivity is zero
B. Reflectivity is zero
C. Absorptivity is zero
D. Reflectivity is unity
Select an option to see the answer and solution.
For an edge dislocation, the intersection of the extra half-plane of atoms with the slip plane defines the
A. dislocation line
B. burger vector
C. dislocation mount
D. none of these
Select an option to see the answer and solution.
A device used for measuring the rate of a flow of a fluid flowing through a pipe.
A. venturi meter
B. Pentameter
C. Orifice meter
D. picometer
Select an option to see the answer and solution.
The dislocation climb is least affected by
A. movement of the atom to dislocation
B. movement of vacancy to the dislocation
C. shear stress
D. high Temperature
Select an option to see the answer and solution.
A metal having a Poisson's ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudnal strain = 0.8, then the magnitude of thickness strain is
Select an option to see the answer and solution.
Two fluids of density ρ1 and ρ2 are flowing at velocity V1 and V2 respectively through smooth pipes of identical diameter and
pressure per unit length. When the friction factor is same, the ratio ρ1 and ρ2 is equal to
A. V 2 V 1
B. ( V 2 V 1 ) 2
C. ( V 1 V 2 ) 2
D. ( V 1 V 2 ) 2 1
Select an option to see the answer and solution.
. . . . . . . . fiber length is necessary for effective strengthening and stiffening of the composite material.
A. Critical
B. small
C. Large
D. all of these
Select an option to see the answer and solution.
In electrical resistance welding, cleaning of metals to be welded is
A. Immaterial
B. Important
C. Not effecting the welding
D. None of these
Select an option to see the answer and solution.
Soldering clearance is given for brass is
A. 0.04 - 0.05 mm
B. 0.5 - 0.75 mm
C. 0.1 - 0.5 mm
D. No clearance
Select an option to see the answer and solution.
In thermit welding heat is generated from
A. Chemical reaction involving finally divided Aluminium and iron oxide
B. Combustion gases
C. Electric arc
D. None of these
Select an option to see the answer and solution.
The minimum stress required to move a dislocation is called
A. the Peierls-Nabarro (PN) stress
B. the Peierls stress
C. the Lattice Friction stress
D. All are correct
Select an option to see the answer and solution.
In hot rolling, Aluminium alloys . . . . . . . . mills are used
A. two high
B. three high
C. four high
D. tandem
Select an option to see the answer and solution.
How much is the extrusion ratio for Aluminium?
A. 100 : 1
B. 40 : 1
C. 400 : 1
D. 60 : 1
Select an option to see the answer and solution.
What is role of matrix in composite
A. Load transfer to composite
B. Load transfer to reinforcement
C. Both A and B
D. None of these
Select an option to see the answer and solution.
What are the factors caused for arc blow?
A. Improper positioning of ground connection
B. Large ferromagnetic mass close to welding Site
C. Long arc length & High welding current
D. All of these
Select an option to see the answer and solution.