Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

Question

Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

A. 1/k

B. k

C. k²

D. 1/k²

Correct Answer :

B. k

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

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The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?

A. 159

B. 1837

C. 2537

D. 10000

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An abrupt and sudden fall in the reading of barometer is an indication of the

A. Storm

B. Rain

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Materials having resistivity ranging from 1 to 100 ohm. cm is termed as

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Which one is neutral in character?

B. N₂O

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Which of the following phenomenon/ phenomena is/are diffusion controlled?

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For a first order chemical reaction, the concentration of the reactant decreases __________ with time.

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Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.

A. 1

B. 10

C. 30

D. 50

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Sand used to stop the green sand from sticking to the pattern is termed as the __________ sand.

C. Loam

D. Dry

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__________ of grey cast iron produces white cast iron.

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When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

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Cold chisels hammers are made of

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With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected.

Discuss this answer

The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as

A. Rigid

B. Tough

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Which of the following are considered applications of ultrasonic testing?

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Dies for wire drawing are generally made of

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Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas)

A. √T

B. 1/√P

C. √y

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Out of the following, the joint produced by __________ has the lowest strength.

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With increase in impurities in metals, their corrosion resistances

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Hot extrusion process is not used for making

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Work study deals with the __________ study.

A. Time

B. Motion

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A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.

A. 150

B. 200

C. 300

D. 400

Discuss this answer

Energy of the sun arises mainly from __________ reactions.

A. Fusion

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Cassiterite is an ore of

A. Tin

B. Lead

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The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm².

A. 273.15

B. 225.65

C. 100.03

D. 373.15

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While the bin cards are used in the effective stores management, the queuing theory is associated with the __________ time.

B. Idle

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For an ideal gas, C_p - C_v is

A. R

B. -R

C. 0

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The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.

A. Creep

Discuss this answer

For the irreversible reaction, C_a+ 2C = C_a C₂ , Δ H°298 = - 60000 J . mole_-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be

Discuss this answer

Answer 1

A. Insulator for heat & electricity transmission

Answer 2

B. Ferritic

Answer 3

C. Behave like paramagnetic materials

Answer 4

D. Superconductor

Answer 5

C. Clear weather

Answer 6

D. Cold wave

Answer 7

A. Conductor

Answer 8

B. Insulator

Answer 9

C. Semi-conductor

Answer 10

D. None of these

Answer 11

A. N₂O₄

Answer 12

C. N₂O₅

Answer 13

D. N₂O₃

Answer 14

A. Parabolic

Answer 15

B. Hyperbolic

Answer 16

C. Straight line

Answer 17

D. None of these

Answer 18

A. Dislocation climb

Answer 19

B. Cross-slip

Answer 20

C. Twinning

Answer 21

D. Recrystallisation

Answer 22

A. Linearly

Answer 23

B. Exponentially

Answer 24

C. Logarithmically

Answer 25

D. Inversely

Answer 26

A. Parting

Answer 27

B. Synthetic

Answer 28

A. Tempering

Answer 29

B. Rapid heating

Answer 30

C. Rapid cooling

Answer 31

D. Slow cooling

Answer 32

A. Partial pressure of water vapour is less than the total pressure

Answer 33

B. Humidity is < 100% & dew point temperature of air has not reached

Answer 34

C. Dew point temperature of air has not reached & air is not saturated fully

Answer 35

D. Air is fully saturated

Answer 36

A. High speed steel

Answer 37

B. High carbon steel

Answer 38

C. Forged steel

Answer 39

D. Mild steel

Answer 40

A. Impact strength

Answer 41

B. Percent elongation

Answer 42

C. Hardness

Answer 43

D. Both 'b' & 'c'

Answer 44

C. Ductile

Answer 45

D. Plastic

Answer 46

A. Determination of elastic constant

Answer 47

B. Detection of defects in metal

Answer 48

C. Measurement of material thickness

Answer 49

D. None of the above

Answer 50

A. Mild steel

Answer 51

B. Stainless steel

Answer 52

C. Carbides

Answer 53

D. High carbon steel

Answer 54

D. 1/√ρ

Answer 55

A. Soldering

Answer 56

B. Welding

Answer 57

C. Brazing

Answer 58

D. Riveting

Answer 59

A. Increase

Answer 60

B. Decrease

Answer 61

C. Remain same

Answer 62

D. May increase or decrease; depending on the type of metal

Answer 63

A. Cast iron pipe for domestic water supply

Answer 64

B. Aluminium curtain rods

Answer 65

C. Stainless steel tubes used in furnitures

Answer 66

D. Any of these

Answer 67

C. Both (A) & (B)

Answer 68

D. Neither (A) nor (B)

Answer 69

B. Fission

Answer 70

C. Combustion

Answer 71

D. None of these

Answer 72

C. Molybdenum

Answer 73

D. Chromium

Answer 74

A. Waiting

Answer 75

C. Inspection

Answer 76

D. Tool replacement

Answer 77

D. (3/2) R

Answer 78

B. Endurance

Answer 79

C. Fatigue

Answer 80

D. None of these

Answer 81

A. 30,000 J

Answer 82

B. 60,000 J

Answer 83

C. 90,000 J

Answer 84

D. 2,40,000 J

Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

Correct Answer :

Show all Chemical Engineering Basics MCQ

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

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Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas)

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A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.

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The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm².

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The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.

For the irreversible reaction, C_a+ 2C = C_a C₂ , Δ H°298 = - 60000 J . mole_-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be

Also checkout

Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

Correct Answer :

Show all Chemical Engineering Basics MCQ

Related Questions

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

The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?

An abrupt and sudden fall in the reading of barometer is an indication of the

Materials having resistivity ranging from 1 to 100 ohm. cm is termed as

Which one is neutral in character?

The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be

Which of the following phenomenon/ phenomena is/are diffusion controlled?

For a first order chemical reaction, the concentration of the reactant decreases __________ with time.

Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.

Sand used to stop the green sand from sticking to the pattern is termed as the __________ sand.

__________ of grey cast iron produces white cast iron.

When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

Cold chisels hammers are made of

With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected.

The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as

Which of the following are considered applications of ultrasonic testing?

Dies for wire drawing are generally made of

Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas)

Out of the following, the joint produced by __________ has the lowest strength.

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Also checkout

The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm².

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For the irreversible reaction, C_a+ 2C = C_a C₂ , Δ H°298 = - 60000 J . mole_-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be