Pick out the correct statement.

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Pick out the correct statement.

A. Hot worked materials are subjected to annealing to remove internal stresses

B. Annealing of steel hardens it slightly

C. Normalising of a material induces stresses

D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness

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Dislocation cross-slip is difficult in those materials, which have

A. Large number of slip systems

B. High work hardening rate

C. Coarse grain size

D. Low stacking fault energy

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Yield strength of a material is determined by the __________ test.

A. Creep

B. Tension

C. Compression

D. Endurance

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The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.

A. 768

B. 1127

C. 1359

D. 1480

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When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively

A. Decreases & increases

B. Increases & increases

C. Increases & decreases

D. Decreases & decreases

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Hooke's law

A. Applies to elastic deformation

B. Applies beyond limit of proportionality in stress-strain curve

C. States that stress is inversely proportional to strain upto elastic limit

D. None of these

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Insulation of liquid surface can be achieved by __________ on top of its surface.

A. Floating hollow polypropylene spheres

B. Spraying alumina powder

C. Putting cement

D. None of these

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Which of the following is not an explosive?

A. TNT

B. CMC

C. RDX

D. Lead azide

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Ultimate strength in tension as compared to that in shear for steel is

A. Half

B. One third

C. One and half times

D. One fourth

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Which of the following is not a charge material for cupola?

A. Limestone

B. Iron scrap

C. Iron ore

D. Pig iron

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Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

A. Grashoff number

B. Grashoff number & Reynolds number

C. Reynolds number

D. Grashoff number & Prandtl number

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Sudden fall of atmospheric pressure by a large amount is an indication of the

A. Rain

B. Cold wave

C. Storm

D. Fair weather

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In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.

A. Percentage elongation

B. Brinell hardness

C. Tensile strength

D. All 'a', 'b' & 'c'

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High speed steel tools retain their hardness upto a temperature of __________ °C.

A. 500

B. 750

C. 900

D. 1100

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__________ number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical.

A. Mach

B. Reynolds

C. Froude

D. Weber

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Cold working of a material results in increase in hardness, which is termed as the __________ hardening.

A. Cold

B. Work

C. Age

D. Induction

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Diamagnetic materials

A. Are magnetised by eddy currents only

B. Are non-magnetic and cannot be magnetised

C. Are magnetised in direction opposite to the magnetic field

D. Can be magnetised in one direction only

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A material subjected __________ must have high resilience.

A. Shock loading

B. Vibration

C. Fatigue

D. Tension

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Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.

A. Film

B. Nucleate

C. Transition

D. All modes of

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__________ property of steel increases by addition of large amount of silicon in it.

A. Mechanical

B. Machining

C. Magnetic

D. Refractory

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Which of the following is a commonly used manometric liquid for low pressure range?

A. Ethyl alcohol

B. Carbon tetrachloride

C. Glycerol

D. Ethylene glycol

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Satellites burn off during re-entry to earth's atmosphere, because of the

A. Combustion with air

B. Gravitational pull by earth

C. Friction with earth's atmosphere

D. Loss in weight of the satellite

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For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.

A. 250

B. 500

C. 1000

D. 3000

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Oxyacetylene reducing flame is used while carrying out welding on

A. Alloy steel

B. Grey cast iron

C. Mild steel

D. High carbon steel

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Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8

A. °C

B. °F

C. °K

D. °R

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Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called

A. Tempering

B. Hardening

C. Annealing

D. Normalising

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Heating of ferromagnetic materials to a temperature above Curie temperature makes it

A. Insulator for heat & electricity transmission

B. Ferritic

C. Behave like paramagnetic materials

D. Superconductor

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The unit of gc is

A. lb_m/lb_f. ft/sec²

B. lb_f/lb_m. ft/sec²

C. ft/sec²

D. lb_m/lb_f. sec²/ft

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Material of construction of the electrode used in the electric resistance welding is

A. Stainless steel

B. Graphite

C. Copper

D. Steel

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__________ iron is produced by the annealing of white cast iron.

A. Malleable

B. Nodular

C. Ductile

D. Grey

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The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?

A. Cyaniding

B. Sherardizing

C. Spheroidising

D. None of these

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Accepted Answer

D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness

Pick out the correct statement.

Correct Answer :

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Related Questions

Dislocation cross-slip is difficult in those materials, which have

Yield strength of a material is determined by the __________ test.

The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.

When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively

Hooke's law

Insulation of liquid surface can be achieved by __________ on top of its surface.

Which of the following is not an explosive?

Ultimate strength in tension as compared to that in shear for steel is

Which of the following is not a charge material for cupola?

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

Sudden fall of atmospheric pressure by a large amount is an indication of the

In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.

High speed steel tools retain their hardness upto a temperature of __________ °C.

__________ number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical.

Cold working of a material results in increase in hardness, which is termed as the __________ hardening.

Diamagnetic materials

A material subjected __________ must have high resilience.

Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.

__________ property of steel increases by addition of large amount of silicon in it.

Which of the following is a commonly used manometric liquid for low pressure range?

Satellites burn off during re-entry to earth's atmosphere, because of the

For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.

Oxyacetylene reducing flame is used while carrying out welding on

Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8

Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called

Heating of ferromagnetic materials to a temperature above Curie temperature makes it

The unit of gc is

Material of construction of the electrode used in the electric resistance welding is

__________ iron is produced by the annealing of white cast iron.

The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?

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