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Objective Questions

Latest ISRO Scientist Engineer Mechanical Exam Question (Objective Questions), MCQ in English

Subjects : Mechanical, Aptitude/Ability

Question Bank ISRO Scientist Engineer (Mechanical Engineering) Exam - English
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Mechanical

Question 1Single Answer
Which casting process uses an expendable sand mold?
  1. A
    Sand casting
  2. B
    Die casting
  3. C
    Centrifugal casting
  4. D
    Permanent mold casting
Question 2Single Answer
The primary function of a pattern in casting is to?
  1. A
    Melt the metal
  2. B
    Produce the mold cavity
  3. C
    Remove slag
  4. D
    Increase hardness
Question 3Single Answer
Shrinkage allowance on a pattern is generally?
  1. A
    Negative
  2. B
    Positive
  3. C
    Zero
  4. D
    Random
Question 4Single Answer
Which pattern allowance compensates for contraction of metal during solidification and cooling?
  1. A
    Draft allowance
  2. B
    Shrinkage allowance
  3. C
    Machining allowance
  4. D
    Distortion allowance
Question 5Single Answer
Draft allowance is provided on patterns mainly to?
  1. A
    Increase casting strength
  2. B
    Facilitate pattern withdrawal
  3. C
    Reduce metal temperature
  4. D
    Increase mold hardness
Question 6Single Answer
A core is primarily used to produce?
  1. A
    External projections
  2. B
    Risers
  3. C
    Surface finish
  4. D
    Internal cavities
Question 7Single Answer
Core prints are provided on a pattern to?
  1. A
    Increase fluidity
  2. B
    Support and locate the core
  3. C
    Prevent shrinkage
  4. D
    Reduce machining
Question 8Single Answer
The upper half of a sand mold is called?
  1. A
    Cope
  2. B
    Drag
  3. C
    Cheek
  4. D
    Sprue
Question 9Single Answer
The lower half of a sand mold is called?
  1. A
    Drag
  2. B
    Cope
  3. C
    Riser
  4. D
    Runner
Question 10Single Answer
The vertical passage through which molten metal enters the runner is called?
  1. A
    Riser
  2. B
    Sprue
  3. C
    Gate
  4. D
    Vent
Question 11Single Answer
The main purpose of a riser is to?
  1. A
    Form the mold cavity
  2. B
    Remove gases only
  3. C
    Increase pouring velocity
  4. D
    Supply molten metal during solidification
Question 12Single Answer
A riser should ideally solidify?
  1. A
    Before the casting
  2. B
    After the casting region it feeds
  3. C
    At the same instant as the mold
  4. D
    Before pouring starts
Question 13Single Answer
Chills used in casting are intended to?
  1. A
    Slow local cooling
  2. B
    Accelerate local solidification
  3. C
    Increase mold permeability
  4. D
    Reduce pouring temperature
Question 14Single Answer
According to Chvorinov's rule, solidification time depends strongly on?
  1. A
    Surface roughness only
  2. B
    Pattern color
  3. C
    Pouring height only
  4. D
    Volume-to-surface-area ratio
Question 15Single Answer
The modulus of a casting is defined as?
  1. A
    Surface area/volume
  2. B
    Volume × surface area
  3. C
    Volume/surface area
  4. D
    Mass/volume
Question 16Single Answer
Which defect is caused by inadequate feeding during solidification?
  1. A
    Misrun
  2. B
    Blowhole
  3. C
    Cold shut
  4. D
    Shrinkage cavity
Question 17Single Answer
A blowhole in a casting is primarily associated with?
  1. A
    Entrapped gas
  2. B
    Excessive machining
  3. C
    Low hardness
  4. D
    Pattern wear
Question 18Single Answer
A cold shut occurs when?
  1. A
    The riser freezes last
  2. B
    A core collapses
  3. C
    Metal penetrates sand
  4. D
    Two metal streams fail to fuse properly
Question 19Single Answer
A misrun occurs when molten metal?
  1. A
    Contains excessive carbon
  2. B
    Does not completely fill the mold cavity
  3. C
    Solidifies only in the riser
  4. D
    Reacts with the pattern
Question 20Single Answer
Which casting process is particularly suitable for long hollow cylindrical components?
  1. A
    Centrifugal casting
  2. B
    Investment casting
  3. C
    Shell molding
  4. D
    Slush casting
Question 21Single Answer
Investment casting is also known as?
  1. A
    Lost-wax process
  2. B
    Full-mold process
  3. C
    Green-sand process
  4. D
    Slush process
Question 22Single Answer
Die casting is most commonly used for?
  1. A
    Concrete components
  2. B
    Very large steel ingots
  3. C
    High-volume production of nonferrous components
  4. D
    Sand cores only
Question 23Single Answer
Shell molding uses a mixture containing sand and?
  1. A
    Graphite only
  2. B
    Cement
  3. C
    Thermosetting resin
  4. D
    Water glass only
Question 24Single Answer
Green sand refers to molding sand that?
  1. A
    Is green in color
  2. B
    Contains moisture
  3. C
    Contains no binder
  4. D
    Has been completely dried
Question 25Single Answer
Permeability of molding sand indicates its ability to?
  1. A
    Allow gases to escape
  2. B
    Resist deformation
  3. C
    Increase hardness
  4. D
    Conduct electricity
Question 26Single Answer
Refractoriness of molding sand is its ability to?
  1. A
    Withstand high temperature
  2. B
    Absorb moisture
  3. C
    Increase ductility
  4. D
    Conduct current
Question 27Single Answer
In a gating system, the runner carries molten metal from?
  1. A
    Sprue to ingates
  2. B
    Riser to cope
  3. C
    Core to riser
  4. D
    Mold to ladle
Question 28Single Answer
A sprue is generally tapered to prevent?
  1. A
    Pattern shrinkage
  2. B
    Grain growth
  3. C
    Aspiration of air
  4. D
    Core breakage
Question 29Single Answer
Plastic deformation becomes permanent because the material is stressed beyond its?
  1. A
    Boiling point
  2. B
    Melting point
  3. C
    Elastic limit
  4. D
    Fatigue life
Question 30Single Answer
The von Mises yield criterion is based on?
  1. A
    Maximum principal stress
  2. B
    Total elastic energy
  3. C
    Maximum principal strain
  4. D
    Distortion energy
Question 31Single Answer
The Tresca yield criterion is based on?
  1. A
    Maximum shear stress
  2. B
    Maximum normal strain
  3. C
    Distortion energy
  4. D
    Hydrostatic stress
Question 32Single Answer
Hot working is carried out above the material's?
  1. A
    Melting temperature
  2. B
    Recrystallization temperature
  3. C
    Boiling temperature
  4. D
    Curie temperature
Question 33Single Answer
A major advantage of hot working is?
  1. A
    Lower ductility
  2. B
    Increased residual stresses
  3. C
    Elimination of strain hardening during deformation
  4. D
    Poorer formability
Question 34Single Answer
Cold working generally increases?
  1. A
    Ductility
  2. B
    Strength and hardness
  3. C
    Grain size
  4. D
    Melting point
Question 35Single Answer
Cold working generally decreases?
  1. A
    Strength
  2. B
    Hardness
  3. C
    Ductility
  4. D
    Residual stress
Question 36Single Answer
Rolling primarily reduces the?
  1. A
    Density of workpiece
  2. B
    Thickness of workpiece
  3. C
    Melting point
  4. D
    Chemical composition
Question 37Single Answer
In rolling, the neutral point is the location where?
  1. A
    Strip velocity equals roll surface velocity
  2. B
    Strip velocity is zero
  3. C
    Roll velocity is zero
  4. D
    Friction is always zero
Question 38Single Answer
Forging generally improves mechanical properties because it?
  1. A
    Creates random porosity
  2. B
    Produces favorable grain flow
  3. C
    Increases inclusions
  4. D
    Eliminates deformation
Question 39Single Answer
Open-die forging is most suitable for?
  1. A
    Large simple components
  2. B
    Very thin sheets only
  3. C
    Fine wires only
  4. D
    Plastic products
Question 40Single Answer
Flash in impression-die forging helps to?
  1. A
    Cool the billet instantly
  2. B
    Eliminate friction
  3. C
    Reduce deformation completely
  4. D
    Build pressure inside the die cavity
Question 41Single Answer
Extrusion produces components by forcing material through?
  1. A
    A cutting tool
  2. B
    Two grinding wheels
  3. C
    A sand mold
  4. D
    A die opening
Question 42Single Answer
In direct extrusion, billet movement relative to the container causes?
  1. A
    No heat generation
  2. B
    Zero friction
  3. C
    No deformation
  4. D
    Significant friction
Question 43Single Answer
Compared with direct extrusion, indirect extrusion generally requires?
  1. A
    Higher billet-container sliding
  2. B
    Higher friction
  3. C
    Lower force
  4. D
    Larger machining allowance
Question 44Single Answer
Wire drawing reduces the cross-section by?
  1. A
    Casting into a mold
  2. B
    Hammering the billet
  3. C
    Pulling material through a die
  4. D
    Grinding between wheels
Question 45Single Answer
Deep drawing is primarily used to manufacture?
  1. A
    Cutting tools
  2. B
    Gears
  3. C
    Shafts
  4. D
    Cup-shaped sheet-metal parts
Question 46Single Answer
A blank holder in deep drawing primarily prevents?
  1. A
    Oxidation
  2. B
    Melting
  3. C
    Wrinkling
  4. D
    Tool wear
Question 47Single Answer
In sheet-metal shearing, clearance is provided between?
  1. A
    Blank holder and sheet
  2. B
    Punch and die
  3. C
    Ram and flywheel
  4. D
    Sheet and lubricant
Question 48Single Answer
In blanking, the useful product is the?
  1. A
    Punch
  2. B
    Remaining strip
  3. C
    Slug only
  4. D
    Blank
Question 49Single Answer
In punching, the material removed from the sheet is generally considered?
  1. A
    Finished product
  2. B
    Scrap
  3. C
    Die
  4. D
    Fixture
Question 50Single Answer
Springback is commonly associated with?
  1. A
    Sand casting
  2. B
    Sheet-metal bending
  3. C
    Sintering
  4. D
    Arc welding
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