A. High pressure & load
B. Low pressure & load
C. High temperature
D. Large surface wear
Related Mcqs:
- Strain hardening effect in metals subjected to cold working is due to the _______________ mechanism?
A. Slip
B. Fracture
C. Winning
D. Dislocation - Which of the following metals is not subjected to electrolytic refining/purification ?
A. Copper
B. Zinc
C. Tin
D. Aluminium - For preparation of porous bearings by powder metallurgy, preferred particle shape is___________________?
A. Spherical
B. Nodular
C. Irregular
D. No preferred shape - Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its________________?
A. Lower cost
B. Abundant availability
C. Resistance to vegetable acids as the tin plate are commercially used in ‘canning’ industry
D. None of these - Which of the following metals cannot be hot worked at room temperature ?
A. Zinc
B. Nickel
C. Lead
D. Tin - In extrusion of metals, which of the following statement is true ?
A. Speed of the extruded material is same as that of ram speed
B. Redundant work is a function of the die angle
C. Relative motion between the billet surface and the container wall is always present
D. Hollow ram is used for indirect extrusion - Change in volume of metals from absolute zero temperature to their melting points is___________________?
A. Almost same for all metals
B. Different for different metals
C. Less for low melting point metals
D. Less for high melting point metals - Super conduction in metals is observed at a temperature of ________________ °K?
A. <100
B. >100
C. About 273
D. About 373 - The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K) ?
A. T
B. 1/T
C. T2
D. 1/T2 - 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
