A. chromium and nickel
B. sulphur, phosphorus, lead
C. vanadium, aluminium
D. tungsten, molybdenum, vanadium, chromium
E. zinc
Related Mcqs:
- Corrosion resistance of steel is increased by adding__________________?
A. chromium and nickel
B. nickel and molybdenum
C. aluminium and zinc
D. tungsten and sulfur
E. none of the above - Depth of hardness of steel is increased by addition of_________________?
A. nickel
B. chromium
C. tungsten
D. vanadium
E. ell of the above - The m.e.p. of a petrol engine first increases as the fuel air ratio is increased and then decreases on further increase in fuel air ratio. The M.E.P is maximum in the zone of________________?
A. lean mixture
B. chemically correct mixture
C. rich mixture
D. unpredictable
E. none of the above - The machinability of steel is increased by___________________?
A. silicon and sulphur
B. phosphorous, lead and sulphur
C. sulphur, graphite and aluminium
D. phosphorous and aluminium
E. none of the above - Which of the following pipes is least corrosion resistant__________________?
A. brass
B. mild steel
C. cast iron
D. wrought iron
E. copper - Addition of manganese to aluminium results in__________________?
A. improvement of casting characteristics
B. improvement of corrosion resistance
C. one of the best known age and precipitation-hardening systems
D. improving machinability
E. none of the above - Addition of silicon to aluminium results in____________________?
A. improvement of casting characteristics
B. improvement of corrosion resistance
C. one of the best known age and precipitation-hardening systems
D. improving machinability
E. none of the above - Addition of lead and bismuth to aluminium results in_________________?
A. improvement of casting characteristics
B. improvement of corrosion resistance
C. one of the best known age and precipitation-hardening systems
D. improving machinability
E. none of the above - Addition of copper to aluminium results in_____________________?
A. improvement of casting characteristics
B. improvement of corrosion resistance
C. one of the best known age and precipitation-hardening systems
D. improving machinability
E. none of the above - For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal____________________?
A. ratio of inertial force to force due to viscosity
B. ratio of inertial force to force due to gravitation
C. ratio of inertial force to force due to surface tension
D. all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity
