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
Related Mcqs:
- Temperature attained in soldering of metals is about ________________ °C?
A. 150-300
B. 400-500
C. 650-800
D. 1000-1100 - Limestone addition in the blast furnace is done to flux _______________ present in the raw materials?
A. SiO2
B. Al2O3
C. MnO2
D. P - In multipass welds, shot peening is done after each pass to__________________?
A. Close the surface porosity
B. Break the continuity of columnar grains
C. Flatten the weldment
D. Introduce texture in the weld - ____________________ flux is used for the extraction of metal from its self fluxing ores?
A. No
B. Acid
C. Basic
D. Neutral - The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the _____________ of the slag ?
A. Fluidity
B. Basicity
C. Acidity
D. Viscosity - The burnout heat flux in the nucleate boiling regime is not a function of the_________________?
A. Liquid density
B. Vapour density
C. Temperature difference
D. Heat of evaporation - Heat flow across a hollow sphere of inner radius ‘r1’ and outer radius ‘r2’ is directly proportional to__________________?
A. (r2 – r1)/r1. r2
B. r1. r2/(r2 – r1)
C. (r2 + r1)/r1. r2
D. r1. r2/(r2 + r1) - Transformation range for ferrous material is the temperature interval during which ___________________ is formed during its heating?
A. Cementite
B. Austenite
C. Martensite
D. Pearlite - Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________________ kJ ?
A. +4000
B. -4000
C. 10000
D. -10000 - Work done by a/an _________________ process is determined by ∫p. dv ?
A. Adiabatic
B. Quasi-static
C. Isothermal
D. Isentropic
