The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10^-16 m²S^-1 and it is 1.94 × 10^-14 m²S^{- 1} at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is

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The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10^-16 m²S^-1 and it is 1.94 × 10^-14 m²S^{- 1} at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is

A. 130

B. 180

C. 230

D. 250

Correct Answer :

C. 230

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Temper brittleness of a material can be fairly detected by the __________ test.

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Carbon is present in the form of __________ in grey cast iron.

C. Flakes

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A. Brass

C. Copper

D. Lead

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A. 5

B. 10

C. 20

D. 35

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A. Lumps

D. Sinter

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A. 1

B. 4.0

C. 8

D. 14

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Discuss this answer

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C. Copper

D. Steel

Discuss this answer

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D. Tough

Discuss this answer

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

Discuss this answer

Pick out the wrong statement.

Discuss this answer

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Discuss this answer

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Discuss this answer

Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process?

Discuss this answer

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

Discuss this answer

A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec² is

A. 8.82

B. 9.81

C. 10.88

D. 0.95

Discuss this answer

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A. Nickel

Discuss this answer

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

A. Impact

Discuss this answer

Answer 1

A. Fatigue

Answer 2

B. Notched bar impact

Answer 3

C. Tensile

Answer 4

D. Hardness

Answer 5

A. Spheroids

Answer 6

B. Nodular aggregates of graphite

Answer 7

D. Cementite

Answer 8

B. Aluminium

Answer 9

B. Pellets

Answer 10

C. Briquettes

Answer 11

A. Less than the wet bulb temperature

Answer 12

B. More than the wet bulb temperature

Answer 13

C. Equal to the wet bulb temperature

Answer 14

D. Equal to the ambient temperature

Answer 15

A. The better insulation material should be put just next to pipe (i.e., inside)

Answer 16

B. The better insulating material should be put outside

Answer 17

C. Either of the insulating material could be put on either side

Answer 18

D. Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)

Answer 19

A. Combustion with air

Answer 20

B. Gravitational pull by earth

Answer 21

C. Friction with earth's atmosphere

Answer 22

D. Loss in weight of the satellite

Answer 23

A. Tensile strength

Answer 24

B. Compressive strength

Answer 25

C. Young's modulus

Answer 26

D. Thermal co-efficient of expansion

Answer 27

A. Nickel, cobalt & chromium

Answer 28

B. Tungsten, chromium & cobalt

Answer 29

C. Manganese, chromium & cobalt

Answer 30

D. Tungsten, molybdenum & nickel

Answer 31

A. Surface finish

Answer 32

B. Fatigue limit

Answer 33

C. Creep limit

Answer 34

D. Surface cleanliness

Answer 35

A. Elastic

Answer 36

B. Ultimate

Answer 37

C. Yielding

Answer 38

D. Breaking

Answer 39

A. Alumina

Answer 40

B. Alkali oxide

Answer 41

C. Lime & Magnesia

Answer 42

D. None of these

Answer 43

A. Cyaniding

Answer 44

B. Parkerizing

Answer 45

C. Austempering

Answer 46

D. Martempering

Answer 47

A. Authored by Kirk Othmer

Answer 48

B. Edited by Perry and Chilton

Answer 49

C. Edited by Kirk Othmer

Answer 50

D. Authored by Perry and Chilton

Answer 51

A. 100% indirect reduction

Answer 52

B. 100% direct reduction

Answer 53

C. 50-60% indirect reduction

Answer 54

D. 30-40% indirect reduction

Answer 55

A. Seamless & made of steel

Answer 56

B. Heat treated before use

Answer 57

C. Made by sand casting

Answer 58

D. Welded steel cylinders

Answer 59

A. Stainless steel

Answer 60

B. Graphite

Answer 61

A. Malleable

Answer 62

B. Ductile

Answer 63

C. Brittle

Answer 64

A. 0.01 to 0.10

Answer 65

B. 0.2 to 0.4

Answer 66

C. 0.5 to 0.7

Answer 67

D. 0.8 to 1.0

Answer 68

A. Geothermal energy is a non-conventional source of energy

Answer 69

B. Mass is converted into energy in both nuclear fission & fusion reaction

Answer 70

C. Inhalation of mercury vapour is not harmful for human beings

Answer 71

D. Inhalation of arsenic causes cancer

Answer 72

A. Can be determined only experimentally

Answer 73

B. Can be determined from the stoichiometry of the reaction

Answer 74

C. Cannot be zero

Answer 75

D. Can be fractional

Answer 76

A. Decreases but dew point remains constant

Answer 77

B. Increases but dew point remains constant

Answer 78

C. Increases & the dew point decreases

Answer 79

D. Decreases & the dew point increases

Answer 80

A. Galvanising

Answer 81

B. Tinning

Answer 82

C. Sherardizing

Answer 83

D. None of these

Answer 84

A. Range is 15°F

Answer 85

B. Approach is 10°F

Answer 86

C. Both (A) & (B)

Answer 87

D. Neither (A) nor (B)

Answer 88

B. Vanadium

Answer 89

C. Molybdenum

Answer 90

D. Chromium

Answer 91

A. Amorphous

Answer 92

B. Cellular

Answer 93

C. Homogeneous

Answer 94

D. Granular

Answer 95

B. Completely reversed

Answer 96

C. Dynamic

Answer 97

D. Static & dynamic

The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10^-16 m²S^-1 and it is 1.94 × 10^-14 m²S^{- 1} at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is

Correct Answer :

Show all Chemical Engineering Basics MCQ

Related Questions

Temper brittleness of a material can be fairly detected by the __________ test.

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Also checkout

The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is

Correct Answer :

Show all Chemical Engineering Basics MCQ

Related Questions

Temper brittleness of a material can be fairly detected by the __________ test.

Carbon is present in the form of __________ in grey cast iron.

Which of the following metals is the most prone to work hardening?

Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than

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The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10^-16 m²S^-1 and it is 1.94 × 10^-14 m²S^{- 1} at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is

For efficient performance of a blast furnace, the extent of reduction of Wustite (F_eO) should be

A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec² is