Lead is added to 60:40 brass primarily to improve
(A) Machinability
(B) Corrosion resistance
(C) Fluidity
(D) Strength

1 Answer

Answer :

(A) Machinability

Related questions

Description : Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its (A) Corrosion resistance (B) Tensile strength (C) Machinability (D) Compressive strength

Last Answer : (C) Machinability

Description : Notched bar test is used for testing the __________ of a material. (A) Impact strength (B) Endurance limit (C) Machinability (D) Corrosion resistance

Last Answer : (A) Impact strength

Description : Normalising does not __________ of a metal. (A) Improve machinability & tensile strength (B) Remove internal stresses (C) Refine the structure (D) Remove strains caused by cold working

Last Answer : Option B

Description : Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its (A) High co-efficient of thermal expansion (B) Low thermal conductivity (C) High corrosion resistance (D) All (A), (B) and (C)

Last Answer : (C) High corrosion resistance

Description : Plasticisers are added to polymers to improve their (A) Tensile strength (B) Softness & flexibility (C) Acid resistance (D) Alkali resistance

Last Answer : (B) Softness & flexibility

Description : . To improve the machinability of steel, it is generally subjected to (A) Spheroidising (B) Tempering (C) Normalising (D) Annealing

Last Answer : (A) Spheroidising

Description : To improve the machinability of steel by its softening, it is subjected to (A) Cold working (B) Annealing (C) Shot blasting (D) Heating

Last Answer : (B) Annealing

Description : Tempering of a material does not improve its (A) Machinability (B) Toughness (C) Internal stress level (D) Softness

Last Answer : A) Machinability

Description : o improve the machinability of steel, it is generally subjected to (A) Spheroidising (B) Tempering (C) Normalising (D) Annealing

Last Answer : Option A

Description : Presence of high phosphorous in cast iron increases its (A) Fluidity (B) Melting point (C) Shrinkage (D) Tensile strength

Last Answer : (A) Fluidity

Description : Cast iron compared to steel is better in (A) Ductility (B) Fluidity & castability (C) Strength (D) Malleability

Last Answer : (B) Fluidity & castability

Description : Addition of nickel to copper improves its (A) Machinability (B) Ductility (C) Strength (D) Hardness

Last Answer : (D) Hardness

Description : Plastics as a material of construction suffer from the drawback of low (A) Machinability (B) Density (C) Strength (D) Plastic deformatio

Last Answer : Option C

Description : Addition of __________ to steel does not help in improving its machinability. (A) Sulphur (B) Silicon (C) Lead (D) Phosphorous

Last Answer : (B) Silicon

Description : Addition of __________ to steel does not help in improving its machinability. (A) Sulphur (B) Silicon (C) Lead (D) Phosphorous

Last Answer : Option B

Description : Babbitt lining is used on brass/bronze bearings to increase the (A) Antifriction properties (B) Compressive strength (C) Bearing resistance

Last Answer : Option D

Description : The process of coating steel sheets by zinc to improve its corrosion resistance is called (A) Calorising (B) Galvanising (C) Zincification (D) Tempering

Last Answer : (B) Galvanising

Description : Which of the following is an example of stress corrosion? (A) Season cracking of brass (B) Caustic embrittlement of steel (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : Option C

Description : Which of the following is (are) true? (A) Cast iron has poor tensile strength compared to steel (B) Failure of cast iron flywheel is sudden and total (C) Machinability of cast iron flywheel is poor compared to steel flywheel (D) All of the above

Last Answer : (D) All of the above

Description : Define: i)Tensile strength ii) Machinability

Last Answer : i) Tensile strength: It is the ability or capacity of a metal to carry the load without breaking. Or A tensile strength of a metal is its ability to resist pull without breaking.  ii) Machinability: ... can be easily cut by cutting tools to produce a desired shape & surface finish on its surface. 

Description : Ceramic nuclear metals compared to solid nuclear metals have (A) Higher melting points (B) Low strength at high temperature (C) More chances of radiation damage (D) Poorer corrosion resistance

Last Answer : (A) Higher melting points

Description : Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its (A) High strength to weight ratio (B) Low temperature strength properties (C) Its ability ... rolled, forged & stamped (D) High strength and corrosion & oxidation-resistance at elevated temperature

Last Answer : (A) High strength to weight ratio

Description : Presence of cobalt in steel improves its (A) Cutting ability (B) Corrosion resistance (C) Tensile strength

Last Answer : (A) Cutting ability

Description : Wrought iron is having very high (A) Hardness (B) Strength (C) Corrosion resistance (D) Susceptibility to changes in its properties by heat treatment

Last Answer : (C) Corrosion resistance

Description : Wrought iron does not have (A) Uniform strength in all directions (B) Ability to hold protective coating (C) High ductility & corrosion resistance (D) Easily weldable characteristics

Last Answer : Option A

Description : Corrosion resistance of steel is increased by the addition of (A) Phosphorous and tungsten (B) Nickel and chromium (C) Lead and vanadium (D) Molybdenum and tungsten

Last Answer : (B) Nickel and chromium

Description : Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower (A) Price (B) Corrosion resistance (C) Thermal conductivity (D) Abundant availability

Last Answer : (D) Abundant availability

Description : Brass is an alloy of copper and zinc having the relative percentage (A) 60-70% Cu and 30-40% Zn (B) 50-60% Cu and 40-50% Zn (C) 40-50 % Cu and 60-50% Zn (D) 30-40 % Cu and 60-70% Zn

Last Answer : A) 60-70% Cu and 30-40% Zn

Description : Which element is added in steel to increase resistance to corrosion ?

Last Answer : Chromium.

Description : Which Element Is Added In Steel To Increase Resistance To Corrosion?

Last Answer : Chromium.

Description : Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its (A) Elasticity (B) Strength (C) Plasticity (D) Weathering characteristics

Last Answer : (D) Weathering characteristics

Description : The amount of tetraethyl lead added to improve the octane number of motor gasoline is around __________ c.c per gallon of petrol. (A) 3 (B) 300 (C) 3000 (D) 1000

Last Answer : (A) 3

Description : Weld decay will cause which of the following problems? a) A reduced resistance to corrosion b) a lower tensile strength c) The toughness is reduced d) The hardness will increase

Last Answer : a) A reduced resistance to corrosion

Description : High copper amalgam lasts longer than low copper amalgam because of:**  A. Increased compressive strength  B. Increased corrosion resistance  C. High creep  D. Increased tensile strength  E. Decreased setting expansion 

Last Answer : A. Increased compressive strength 

Description : Rosin soap is added during paper manufacture to (A) Impart adhesive properties (B) Improve opacity (C) Impart resistance to penetration by liquids (D) None of these

Last Answer : (C) Impart resistance to penetration by liquids

Description : Amino resins are used in paper treatment to improve its (A) Wet tear and bursting strength (B) Folding endurance (C) Wet rub resistance (D) All (A), (B) & (C)

Last Answer : (D) All (A), (B) & (C)

Description : __________ is added in stainless steel to prevent inter crystal corrosion. (A) Vanadium (B) Niobium (C) Chromium (D) Nickel

Last Answer : (B) Niobium

Description : . Plasticisers are added to paints to (A) Make it corrosion resistant (B) Make glossy surface (C) Give elasticity & prevent cracking of the film (D) Increase atmospheric oxidation

Last Answer : (C) Give elasticity & prevent cracking of the film

Description : Builders are added in soap to act as (A) Cleaning power booster (B) Anti-redeposition agent (C) Corrosion inhibitor (D) Fabric brightener

Last Answer : (A) Cleaning power booster

Description : . Carboxymethyl cellulose (CMC) is added in detergents to (A) Prevent redeposition of soil on cleaned surface (B) Act as optical brightening agent (C) Inhibit corrosion in washing machines made of aluminium (D) None of these

Last Answer : (A) Prevent redeposition of soil on cleaned surface

Description : Presence of high amount of silicon in cast iron (A) Suppresses the decomposition of Fe3C (B) Increases the formation of graphite (C) Increases the contraction of the metal (D) Reduces its fluidity

Last Answer : (B) Increases the formation of graphite

Description : Water is normally used as a coolant in the heat exchange equipments mainly because of its (A) Abundance & high heat capacity (B) Low density (C) Low viscosity (D) High fluidity

Last Answer : (A) Abundance & high heat capacity

Description : Higher viscosity index of a lubricating oil denotes (A) Less changes in fluidity of oil with temperature (B) Substantially high change in fluidity of oil with temperature (C) Its unsuitability under varying temperature conditions (D) None of these

Last Answer : (A) Less changes in fluidity of oil with temperature

Description : Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because (A) Its calorific value is very less (B) Tar neutralises the residual acids ... for its transportation through pipelines at economic pressure drop (D) All (A), (B) and (C)

Last Answer : (C) It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop

Description : Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore? (A) High fusibility & fluidity (B) High thermal conductivity (C) Low density (D) High chemical activity

Last Answer : B) High thermal conductivity

Description : 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

Last Answer : (B) Prevent oxide formation

Description : 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

Last Answer : Option A

Description : 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

Last Answer : Option A

Description : Addition of silicon to cast iron (A) Promotes graphite module formation (B) Improves its ductility (C) Does not promote graphite flakes formation (D) Increases the fluidity of molten metal

Last Answer : Option D

Description : Machinability of hard alloys and tool steels is improved by (A) Spheroidising (B) Annealing (C) Tempering (D) Normalising

Last Answer : Option B