Competitive Mechanical Engineering – MCQs Engineering Materials MCQs Latest
This post is comprising of latest “Engineering Materials MCQs Latest – Competitive Mechanical Engineering MCQs “. Here you’ll get latest mechanical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding mechanical engineering then read these mcqs of Design of Steel Structures.
Latest Mechanical Engineering MCQs
By practicing these MCQs of Mechanical Engineering MCQs – Engineering Materials Mcqs, an individual for exams performs better than before. This post comprising of mechanical engineering objective questions and answers related to “Engineering Materials Mcqs“. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of mechanical engineering to approach the success. Tab this page to check “Latest Engineering Materials Mcqs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others.
Latest Engineering Materials Mcqs
The most occurred mcqs of Engineering Materials in past papers. Past papers of Engineering Materials Mcqs. Past papers of Engineering Materials Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Engineering Materials Mcqs. The Important series of Engineering Materials Mcqs are given below:
Carbon steel is_______________?
A. refined from cast iron
B. made by adding carbon in steel
C. an alloy of iron and carbon with varying quantities of phosphorus and sulphur
D. extensively used for making cutting tools
E. extremely brittle
An important property of malleable cast iron in comparison to grey cast iron is the high___________________?
A. carbon content
B. ductility
C. compressive strength
D. hardness
E. surface finish
In mottled cast iron, carbon is available in__________________?
A. combined form
B. free form
C. nodular form
D. flat form
E. partly in free and partly in combined state
Cast iron has_________________?
A. high ductility
B. its elastic limit close to the ultimate breaking strength
C. high tensile strength
D. all of the above
E. none of the above
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as_________________?
A. allotropic change
B. heat treatment
C. recrystallisation
D. precipitation
E. austempering
Pick up wrong statement about wrought iron ?
A. It contains carbon of the order of 0 to 0.25%
B. It melts at 1535°C
C. It can be easily forge welded
D. It is very soft and ductile
E. It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling
Wrought iron is________________?
A. high in strength
B. hard
C. highly resistant to corrosion
D. heat treated to change its properties
E. least resistant to corrosion
In nodular iron, graphite is in the form of_____________________?
A. free carbon
B. cementite
C. flakes
D. spheroids
E. nodular aggregates of graphite
Pig iron is the name given to________________?
A. iron in molten form in the ladles
B. product of blast furnace made by reduction of iron ore
C. iron containing huge quantities of carbon
D. raw material for blast furnace
E. iron scrap
The percentage of carbon in pig iron varies from___________________?
A. 2.5 to 4%
B. 1.5 to 2.5%
C. 0.1 to 1.2%
D. 4 to 4.5%
E. 4.5 to 6.3%
The metallic structure of mild steel is_________________?
A. body centred cubic
B. hexagonal close packed
C. face centred cubic
D. cubic structure
E. orthorhombic crystal
The crystal structure of gamma iron is_________________?
A. hexagonal close packed
B. face centred cubic
C. body centred cubic
D. cubic structure
E. orthorhombic crystal
Paramagnetic alpha iron changes to gamma iron at_______________?
A. 1440°C
B. 910°C
C. 770°C
D. 1539°C
E. none of the above
The molecules in a solid move______________?
A. in a haphazard way
B. in a random manner
C. in circular motion
D. back and forth like tiny pendulums
E. do not move
Cast iron is characterised by minimum of following %age of carbon_________________?
A. 0.8%
B. 0.2%
C. 1.3%
D. 2%
E. 6.3%.
Engineering Materials Mcqs – Mechanical Engineering
Pure iron is the structure of_______________?
A. ferrite
B. anstenite
C. pearlite
D. ferrite and cementite
E. ferrite and pearlite
Gamma iron exits at following temperature___________________?
A. near melting point
B. room temperature
C. between 1400°C and 1539°C
D. between 910°C and 1400°C
E. none of the above
Which of the following represents the allotropic forms of iron__________________?
A. alpha iron and beta iron
B. alpha iron, beta iron and gamma iron
C. body centred cubic a-iron and face centred cubic a-iron
D. alpha iron, gamma from and delta iron
E. none of the above
Super conduction by metals is observed in the temperature range of_________________?
A. below 10°K
B. around 0°C
C. above 100°K
D. around 100°C
E. above 1000°C
Delta iron occurs at temperature of_______________?
A. above melting point
B. room temperature
C. between 1400°C and 1539°C
D. between 910°C and 1400°C
E. none of the above
Recrystallization temperature is one________________?
A. at which crystals first start forming from molten metal when it is cooled
B. at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
C. at which crystals grow bigger in size
D. at which change of allotropic form takes place
E. at which crystals are destroyed on heating
The elastic stress strain behaviour of rubber is_____________________?
A. plastic
B. non-linear
C. linear
D. no fixed relationship
E. unpredictable behaviour
The number of electrons in 1 cm3 of metal would be of the order of_______________?
A. 1O16
B. 1010
C. 1022
D. 1040
E. 1052
Slow plastic defomiation of metals under a constant stress is known as________________?
A. creep
B. endurance
C. fatigue
D. plastic deformation
E. non-plastic deformation
In compression, a prism of brittle material will break________________?
A. by forming a bulge (l>) by shearing along oblique plane
B. by crushing into thousands of pieces
C. in direction perpendicular to application of load
D. none of the above
Ductility of a material can be defined as__________________?
A. ability to recover its original form
B. ability to undergo large permanent deformations in compression
C. ability to undergo large permanent deformations in tension
D. all of the above
E. none of the above
The ultimate tensile strength of low carbon steel by working at a high strain rate will_________________?
A. remain constant
B. increase
C. decrease
D. first increase and then decrease
E. first decrease and then increase
Sulphur in steel________________?
A. reduces the grain size
B. acts as deoxidiser
C. decreases tensile strength and hardness
D. lowers the toughness and transverse ductility
E. increases hardness
Tungsten in high speed steel provides________________?
A. hot hardness
B. wear resistance
C. toughness
D. sharp cutting edge
E. cold hardness
Connecting rod is usually made of_________________?
A. low carbon steel
B. aluminium
C. medium carbon steel
D. high carbon steel
E. cast iron
Tensile strength of steel can be safely in-creased by________________?
A. adding carbon up to 6.3%
B. adding carbon up to 2.8%
C. adding carbon up to 0.83%
D. adding small quantities of copper
E. adding copper and carbon
Cobalt in steel __________________?
A. gives ductility, toughness, tensile strength and anti corrosion property
B. refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties
C. improves cutting ability and reduce hardenability
D. improves wear resistance, cuttinability and toughness
E. none of the above
The hardness of steel increases if it contains____________________?
A. pearlite
B. martensite
C. austenite
D. cementite
E. all of the above
Nodular iron has____________________?
A. low melting point
B. high maehinability
C. high tensile strength
D. good fluidity
E. all of the above
Which of the following elements does not impart hardness to steel__________________?
A. copper
B. nickel
C. chromium
D. silicon
E. none of the above
Melting point of iron is__________________?
A. 1539°C
B. 1489°C
C. 1601°C
D. 1712°C
E. 1131°C
Blast furnace produces following by reduction of iron ore_______________?
A. wrought iron
B. pig iron
C. cast iron
D. malleable iron
E. white iron
The machinability of steel is increased by___________________?
A. phosphorous and aluminium
B. phosphorous, lead and sulphur
C. sulphur, graphite and aluminium
D. silicon and sulphur
E. none of the above
Which of the following element results in presence of free graphite in C.I_________________?
A. sulphur
B. carbon
C. silicon
D. manganese
E. phosphorous
Fluid Mechanics Mcqs – Mechanical Engineering Mcqs
Cold rolled steel sheets contain carbon of the following order___________________?
A. 0.1%
B. 0.4%
C. 0.2%
D. 0.6%
E. 0.8%
Large forgings, crank shafts, axles normally contain carbon up to________________?
A. 0.20 to 0.45%
B. 0.05 to 0.20%
C. 0.45 to 0.55%
D. 0.55 to 1.0%
E. 1.0 to 1.2%.
Taps, dies and drills contain carbon________________?
A. below 1%
B. below 0.5%
C. above 1%
D. above 2.2%
E. nil
Which is the false statement about wrought iron. It has________________?
A. high ductility
B. high resistance to rusting and corrosion
C. ability of hold protective coating
D. easily weldable characteristics
E. uniform strength in all directions
Balls for ball bearings are made of_________________?
A. mild steel
B. cast iron
C. stainless steel
D. carbon-chrome steel
E. high carbon steel
Preheating is essential in welding ___________________?
A. cast iron
B. all non-ferrous materials
C. high speed steel
D. all of the above
E. none of the above
The tensile strength of wrought iron is maximum _________________?
A. along the lines of slag distribution
B. uniform in all directions
C. perpendicular to lines of slag distribution
D. unpredictable
E. none of the above
Drop forging dies contain carbon of the order of_________________?
A. 0.25 to 0.5%
B. 0.1 to 0.2%
C. 0.6 to 0.7%
D. 0.7 to 0.9%
E. 1.0 to 1.2%.
Heavy duty leaf and coil spring* contain carbon of the following order ________________?
A. 0.2%
B. 0.8%
C. 0.5%
D. 1.0%
E. 1.5%.
Pipes for bicycle frames are made of___________________?
A. cold rolled steel
B. forged steel
C. hot rolled steel
D. cast steel
E. carbon-chrome steel
White cast iron__________________?
A. is produced by annealing process. It is soft, tough and easily machined metal
B. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
D. is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
E. none of the above
The following element can’t impart high strength at elevated temperature__________________?
A. nickel
B. magnesium
C. manganese
D. silicon
E. none of the above
Cupola produces following material__________________?
A. cast iron
B. wrought iron
C. pig iron
D. malleable iron
E. white iron
Compressive strength of grey cast iron in tonnes/cm is of the order of___________________?
A. 3- 5
B. 5-7
C. 10-15
D. 7-10
E. 15-22
The presence of sulphur in pig iron makes__________________?
A. it brittle
B. it easily machinable
C. it hard
D. the casting unsound
E. increases the fluidity
Nickel in steel___________________?
A. improves cutting ability and reduces hardenability
B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties
C. improves wear resistance, cutting ability and toughness
D. gives ductility, toughness, tensile strength and anticorrosion properties
E. none of the above
Grey cast iron_____________________?
A. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
B. is produced by annealing process. I is soft, tough and easily machinec metal
C. is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable
D. is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material
E. none of the above is true
The percentage of carbon in low carbon steel is__________________?
A. 0.3%
B. 0.15%
C. 0.05%
D. 0.5%
E. 0.7%.
High carbon steel carries carbon %age c_________________?
A. 0.3 to 0.6%
B. 0.1 to 0.3%
C. 0.6 to 0.8%
D. 0.8 to 1.5%
E. 1.5 to 2.5%.
Which of the following pipes is least corrosion resistant__________________?
A. brass
B. cast iron
C. mild steel
D. wrought iron
E. copper
Which of the following is not the correct method of increasing fatigue limit __________________?
A. cold working
B. nitriding of surface
C. shot peening
D. surface decarburisation
E. under-stressing