A. Hot worked materials are subjected to annealing to remove internal stresses
B. Annealing of steel hardens it slightly
C. Normalising of a material induces stresses
D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness
Related Mcqs:
- Pick out the correct statement about the condensation?
A. Filmwise condensation gives a lower heat transfer rate than the dropwise condensation
B. Suitable coating or vapour additive is used to promote film wise condensation
C. If a condensing liquid does not wet the surface dropwise, even then condensation will take
place on it
D. Reynolds number of condensing liquid is based on its mass flow rate - Pick out the correct statement ?
A. Jet engine can work, where there is no atmosphere
B. Rocket engines cannot work, where there is no atmosphere
C. Rocket engines carry oxygen required for the combustion in the form of oxidiser
D. Jet engines also carry oxidiser - Pick out the correct combination about the role of various additives used in polymers ?
A. Plasticiser: increases the polymer strength
B. Heat stabiliser: increases the maximum service temperature
C. Fillers: Does not affect the property of polymer but increases its weight
D. Lubricants: increases the flexibility of polymers - Pick out the wrong statement about the machinability of metals. Machinability of a metal ?
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 - Pick out the wrong statement?
A. Copper is the metal having the highest electronic conductivity
B. Hardenability & Weldability of metals are inversely related
C. Covalent bonding formed by sharing of electrons is present in all semi-conductor materials
D. Glass transition temperature applies to ‘polymers’ but not to ‘glasses’ - Pick out the wrong statement?
A. Complete unity of command exists in a line organisation
B. Line organisation is net suitable for expansion and growth of an industry
C. In line and staff organisation, “line” executes and “staff directs
D. None of these - 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. The X-rays cannot be deflected by electric field unlike cathode rays
B. The intensity of X-rays can be measured by ionisation current produced due to the ionisation
of gas by X-rays
C. The quality of X-rays can be controlled by varying the anode-cathode voltage
D. Crystal structure of a material can be studied by an electron microscope - Pick out the wrong statement ?
A. Geothermal energy is a non-conventional source of energy
B. Mass is converted into energy in both nuclear fission & fusion reaction
C. Inhalation of mercury vapour is not harmful for human beings
D. Inhalation of arsenic causes cancer - 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
