A. 150-300
B. 400-500
C. 650-800
D. 1000-1100
Related Mcqs:
- 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 - Super conduction in metals is observed at a temperature of ________________ °K?
A. <100
B. >100
C. About 273
D. About 373 - While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to ______________ × Tm (where, Tm Melting temperature) ?
A. 0.25
B. 0.45
C. 0.70
D. 0.95 - Absolute zero pressure can be attained at a temperature of___________________?
A. 0°C
B. 50°K
C. 0°R
D. None of these - Use of flux during soldering is done to__________________?
A. Increase fluidity of solder by lowering its melting temperature
B. Prevent oxide formation
C. Wash away surplus solder
D. Full up the joint gap - Which of the following metals cannot be hot worked at room temperature ?
A. Zinc
B. Nickel
C. Lead
D. Tin - 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 - The boiling & freezing points on a newly defined temperature scale in degree ‘D’ are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to _____________ °D ?
A. 140
B. 180
C. 240
D. 280 - Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________?
A. Tempering
B. Hardening
C. Annealing
D. Normalising - Tin based white metals are used, where bearings are subjected to___________________?
A. High pressure & load
B. Low pressure & load
C. High temperature
D. Large surface wear
