A. Decreases with increase in strain hardening tendencies
B. Decreases with increase in hardness, in general
C. Depend on the composition, microstructure and physical & mechanical properties
D. Decreases with increases in tensile strength & decrease in grain size
Related Mcqs:
- Pick out the wrong statement about coating/electroplating of metals ?
A. Phosphate coating is used as an excellent base for paints & enamels
B. Phosphate coating is less corrosion resistant than chromate coating
C. The base metal to be electroplated is normally made the cathode of the electrolytic cell and
coating metal is made the anode
D. Calorising is the process of coating steel with chromium - Addition of _______________ to steel does not help in improving its machinability ?
A. Sulphur
B. Silicon
C. Lead
D. Phosphorous - To improve the machinability of steel, it is generally subjected to _____________________?
A. Spheroidising
B. Tempering
C. Normalising
D. Annealing - Machinability of hard alloys and tool steels is improved by_____________________?
A. Spheroidising
B. Annealing
C. Tempering
D. Normalising - Addition of ____________________ to steel does not help in improving its machinability?
A. Sulphur
B. Silicon
C. Lead
D. Phosphorous - Pick out the wrong statement ?
A. Both annealing and normalising release the internal stresses of the material besides improving
the mechanical properties
B. Low carbon steel does not respond to the heat treatment for hardening of the material, hence it
is subjected to case hardening or surface hardening processes like cyaniding, carburising,
nitriding etc., which produces high carbon outer layers resulting in increase of surface
hardness
C. Induction hardening and flame hardening techniques are also used for surface hardening
D. Martempering of a material is a hardening process - Pick out the wrong statement?
A. Processing of thermosetting plastics is ideally done by injection moulding
B. Processing of thermoplastics is ideally done by compression moulding
C. Mass production of seamless pipes are done by electrical resistance welding (ERW)
D. Stretch forming is a process of cold drawing - Pick out the wrong statement ?
A. Seam welding, projection welding & spot welding are the classification of electrical resistance
welding
B. Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t =
plate thickness to be welded)
C. In spot welding, two pieces to be joined are overlapped and placed between two electrodes
D. Mild steel sheet cannot be spot welded - Pick out the wrong statement?
A. Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly
caused by the formation and coalescence of voids in the necked region
B. Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation
C. Fatigue fracture of a material is always brittle in nature and takes place due to the existence of
line imperfections
D. Brittle materials are generally tested in tension - Pick out the wrong statement ?
A. The equivalent stiffness of two springs (of equal stiffness ‘S’) in series is S/2 while in parallel
is 2S
B. For a helical spring, deflection is proportional to D3 (D = mean coil diameter) or d4 (d = wire
diameter)
C. Crushing load or columns is less than the buckling load
D. Modulus of resilience is proportional to (stress at elastic limit)2
