The thickness of oxide film is y at time t. If are the temperature dependent constants, the parabolic law of oxidation is given by

Question

The thickness of oxide film is y at time t. If are the temperature dependent constants, the parabolic law of oxidation is given by

A.

B.

C.

D.

Correct Answer :

A.

Share this question with your friends

Show all Chemical Engineering Basics MCQ

Comment

The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)

A. T

B. 1/T

C. T²

D. 1/T²

Discuss this answer

According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point is

A. 180°

B. 212°

C. 32°

D. 273°

Discuss this answer

Uniform ramming of sand in green sand moulding process leads to

Discuss this answer

To counteract the bad effects of strain hardening on a cold formed part, it must be

Discuss this answer

In case of a, centrifugal pump, the ratio h₁/h₂ is termed as the __________ efficiency (where, h₁ = actual measured head & h₂ = head imparted to the fluid by impeller).

Discuss this answer

Wrought iron is not

Discuss this answer

Which of the following is an unconventional source of energy?

Discuss this answer

__________ is not a heat treatment process.

Discuss this answer

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

Discuss this answer

Mild steel has __________ crystal lattice structure.

D. Cubic

Discuss this answer

Nusselt number/Biot number varies

Discuss this answer

__________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.

D. Lead

Discuss this answer

Pick out the correct combination about the role of various additives used in polymers.

Discuss this answer

The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x^0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

A. x^1.5

B. x^0.8

C. x^-1.5

D. x^-0.8

Discuss this answer

A material being tested for endurance strength is subjected to the __________ load.

A. Impact

Discuss this answer

Which of the following is the most wear resistant grade of carbide used for the cutting tools?

Discuss this answer

Temperature profile along the length of a gasgas counter flow heat exchanger is correctly represented by

A.

B.

C.

D.

Discuss this answer

Natural water contains approximately __________ percent of heavy water.

A. 0.015

B. 0.71

C. 1.2

D. 3.5

Discuss this answer

__________ flux is used for the extraction of metal from its self fluxing ores.

A. No

B. Acid

C. Basic

Discuss this answer

Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

Discuss this answer

Material of construction of foundry crucible is

A. Lead

Discuss this answer

The noble metals

Discuss this answer

Change in volume of metals from absolute zero temperature to their melting points is

Discuss this answer

Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel.

Discuss this answer

Tip of the match stick contains a mixture of

A. K + S

Discuss this answer

A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons.

Discuss this answer

The best lubricants for a machine working at high temperature & load is

A. Grease

Discuss this answer

Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?

Discuss this answer

Increasing sulphur content in pig iron tends to make it

A. Soft

B. Hard

C. Tough

Discuss this answer

The product of a commercial direct reduction process is

Discuss this answer

Answer 1

A. Reduced chance of gas porosity

Answer 2

B. Greater dimensional stability of the casting

Answer 3

C. Uniform flow of molten metal into the mould cavity

Answer 4

D. Less sand expansion type of casting defect

Answer 5

A. Tempered

Answer 6

B. Normalised

Answer 7

C. Annealed

Answer 8

D. Hardened

Answer 9

A. Mechanical

Answer 10

B. Overall

Answer 11

C. Volumetric

Answer 12

D. Impeller

Answer 13

A. Ductile & resistant to corrosion/rusting

Answer 14

B. Weldable easily

Answer 15

C. Having uniform strength in all directions

Answer 16

D. Having maximum tensile strength along the lines of slag distribution

Answer 17

A. Thermal power

Answer 18

B. Hydroelectric power

Answer 19

C. Nuclear-fusion power

Answer 20

D. Solar power

Answer 21

A. Cyaniding

Answer 22

B. Parkerizing

Answer 23

C. Austempering

Answer 24

D. Martempering

Answer 25

A. Impact strength

Answer 26

B. Percent elongation

Answer 27

C. Hardness

Answer 28

D. Both 'b' & 'c'

Answer 29

A. Face centred cubic (fcc)

Answer 30

B. Body centred cubic (bcc)

Answer 31

C. Orthorhombic

Answer 32

A. Inversely with thermal conductivity

Answer 33

B. Directly with heat transfer co-efficient

Answer 34

C. Directly with thermal conductivity

Answer 35

D. Inversely with the dimension of the solid

Answer 36

A. Borosilicate

Answer 37

B. High silica

Answer 38

C. Supermax

Answer 39

A. Plasticiser: increases the polymer strength

Answer 40

B. Heat stabiliser: increases the maximum service temperature

Answer 41

C. Fillers: Does not affect the property of polymer but increases its weight

Answer 42

D. Lubricants: increases the flexibility of polymers

Answer 43

B. Completely reversed

Answer 44

C. Dynamic

Answer 45

D. Static & dynamic

Answer 46

A. Aluminium carbide

Answer 47

B. Tungsten carbide

Answer 48

C. Nickel carbide

Answer 49

D. Iron carbide

Answer 50

D. Neutral

Answer 51

A. Scratch

Answer 52

B. Indentation

Answer 53

C. Dynamic

Answer 54

D. Rebound

Answer 55

B. Stainless steel

Answer 56

C. Graphite

Answer 57

D. Cast iron

Answer 58

A. Are exemplified by Na, K and Li

Answer 59

B. Do not resist corrosion very strongly

Answer 60

C. Are the lowermost in the electro-chemical series of metals

Answer 61

D. None of these

Answer 62

A. Almost same for all metals

Answer 63

B. Different for different metals

Answer 64

C. Less for low melting point metals

Answer 65

D. Less for high melting point metals

Answer 66

A. 0.01 to 0.10

Answer 67

B. 0.2 to 0.4

Answer 68

C. 0.5 to 0.7

Answer 69

D. 0.8 to 1.0

Answer 70

B. K + S + K₂Cr₂O₇

Answer 71

C. S + K₂Cr₂O₇ + White P

Answer 72

D. None of these

Answer 73

A. Lack of free

Answer 74

B. Excess of

Answer 75

C. Decrease in

Answer 76

D. None of these

Answer 77

B. Solid lubricant

Answer 78

C. Animal oils

Answer 79

D. Mineral oils

Answer 80

A. Output & fineness

Answer 81

B. Velocity

Answer 82

C. Both (A) & (B)

Answer 83

D. None of these

Answer 84

D. Ductile & malleable

Answer 85

A. Liquid iron

Answer 86

B. Solid iron

Answer 87

C. Sponge iron

Answer 88

D. Iron saturated with carbon

The thickness of oxide film is y at time t. If are the temperature dependent constants, the parabolic law of oxidation is given by

Correct Answer :

Show all Chemical Engineering Basics MCQ

Related Questions

The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)

According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point is

Uniform ramming of sand in green sand moulding process leads to

To counteract the bad effects of strain hardening on a cold formed part, it must be

In case of a, centrifugal pump, the ratio h₁/h₂ is termed as the __________ efficiency (where, h₁ = actual measured head & h₂ = head imparted to the fluid by impeller).

Wrought iron is not

Which of the following is an unconventional source of energy?

__________ is not a heat treatment process.

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

Mild steel has __________ crystal lattice structure.

Nusselt number/Biot number varies

__________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.

Pick out the correct combination about the role of various additives used in polymers.

The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x^0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

A material being tested for endurance strength is subjected to the __________ load.

Which of the following is the most wear resistant grade of carbide used for the cutting tools?

Temperature profile along the length of a gasgas counter flow heat exchanger is correctly represented by

Natural water contains approximately __________ percent of heavy water.

__________ flux is used for the extraction of metal from its self fluxing ores.

Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

Material of construction of foundry crucible is

The noble metals

Change in volume of metals from absolute zero temperature to their melting points is

Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel.

Tip of the match stick contains a mixture of

A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons.

The best lubricants for a machine working at high temperature & load is

Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?

Increasing sulphur content in pig iron tends to make it

The product of a commercial direct reduction process is

Also checkout

The thickness of oxide film is y at time t. If are the temperature dependent constants, the parabolic law of oxidation is given by

Correct Answer :

Show all Chemical Engineering Basics MCQ

Related Questions

The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)

According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point is

Uniform ramming of sand in green sand moulding process leads to

To counteract the bad effects of strain hardening on a cold formed part, it must be

In case of a, centrifugal pump, the ratio h1/h2 is termed as the __________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller).

Wrought iron is not

Which of the following is an unconventional source of energy?

__________ is not a heat treatment process.

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

Mild steel has __________ crystal lattice structure.

Nusselt number/Biot number varies

__________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.

Pick out the correct combination about the role of various additives used in polymers.

The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

A material being tested for endurance strength is subjected to the __________ load.

Which of the following is the most wear resistant grade of carbide used for the cutting tools?

Temperature profile along the length of a gasgas counter flow heat exchanger is correctly represented by

Natural water contains approximately __________ percent of heavy water.

__________ flux is used for the extraction of metal from its self fluxing ores.

Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

Material of construction of foundry crucible is

The noble metals

Change in volume of metals from absolute zero temperature to their melting points is

Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel.

Tip of the match stick contains a mixture of

A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons.

The best lubricants for a machine working at high temperature & load is

Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?

Increasing sulphur content in pig iron tends to make it

The product of a commercial direct reduction process is

Also checkout

In case of a, centrifugal pump, the ratio h₁/h₂ is termed as the __________ efficiency (where, h₁ = actual measured head & h₂ = head imparted to the fluid by impeller).

The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x^0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)