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)

Question

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

Correct Answer :

B. x^0.8

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A. Cold

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B. Glass

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C. Copper

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A. 15

B. 25

C. 10

D. 30

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B. Ions

D. Holes

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C. Wear

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A. 2-5

B. 18-20

C. 12-15

D. 6-12

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B. Copper

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The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.

A. Carbon

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Aluminium is extracted from

C. Galena

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A. More

B. Less

C. Equal

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Which of the following approaches the ideal gas behaviour most closely?

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A. CaF₂

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B. X-rays

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Dielectric

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Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of

A. Paper

B. Cloth

C. Lead

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Which of the following phenomenon will exhibit the minimum heat transfer?

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Answer 1

A. Free expansion of an ideal gas

Answer 2

B. Adiabatic expansion of steam in turbine

Answer 3

C. Adiabatic compression of air

Answer 4

D. Ideal compression of air

Answer 5

D. Induction

Answer 6

A. Wet bulb temperature

Answer 7

B. Dry bulb temperature

Answer 8

C. Relative humidity

Answer 9

D. Specific humidity

Answer 10

B. Glass wood

Answer 11

D. Fireclay bricks

Answer 12

A. Soft ferrites

Answer 13

B. High purity iron

Answer 14

C. Grain oriented Fe-Si alloy

Answer 15

D. Al-Ni-Co alloy

Answer 16

A. Emissivity of pipe surface

Answer 17

B. Diameter & length of the pipe

Answer 18

C. Temperature of hot pipe surface & that of air in the room

Answer 19

D. None of these

Answer 20

A. Free electrons

Answer 21

C. Conduction electrons

Answer 22

A. Power saving per unit weight of air delivered

Answer 23

B. Moisture elimination in the inter-stage cooler

Answer 24

C. Increased volumetric efficiency

Answer 25

D. All (A), (B) & (C)

Answer 26

A. Cast iron

Answer 27

B. Soft brass

Answer 28

C. Round specimen of ductile metal

Answer 29

D. Flat tensile specimen of ductile metal

Answer 30

A. Decrease in the viscosities of both liquids & gases

Answer 31

B. Increase in the viscosities of both liquids & gases

Answer 32

C. Increase in the viscosity of liquids and decrease in that of gases

Answer 33

D. Decrease in the viscosity of liquids and increase in that of gases

Answer 34

A. Fracture

Answer 35

B. Indentation

Answer 36

D. Scratch

Answer 37

A. Cast iron pipe for domestic water supply

Answer 38

B. Aluminium curtain rods

Answer 39

C. Stainless steel tubes used in furnitures

Answer 40

D. Any of these

Answer 41

A. Martenistic

Answer 42

B. Bainitic

Answer 43

C. Pearlitic

Answer 44

D. Ferritic

Answer 45

A. Aluminium

Answer 46

C. Titanium

Answer 47

D. Stainless steel

Answer 48

B. Manganese

Answer 49

C. Both 'a' nor 'b'

Answer 50

D. Neither 'a' nor 'b'

Answer 51

A. Chalcocite

Answer 52

B. Bauxite

Answer 53

D. None of these

Answer 54

D. Much more

Answer 55

A. Wet steam

Answer 56

B. Saturated steam

Answer 57

C. Superheated steam

Answer 58

D. Saturated water

Answer 59

B. Ca₃(PO₄)₂

Answer 60

C. CaCO₃

Answer 61

D. CaCl₂

Answer 62

A. Adiabatic

Answer 63

B. Quasi-static

Answer 64

C. Isothermal

Answer 65

D. Isentropic

Answer 66

A. Tempering

Answer 67

B. Annealing

Answer 68

C. Normalising

Answer 69

D. Carburising

Answer 70

A. (r₂ - r₁)/r₁. r₂

Answer 71

B. r₁. r₂/(r₂- r₁)

Answer 72

C. (r₂ + r₁)/r₁. r₂

Answer 73

D. r₁. r₂/(r₂ + r₁)

Answer 74

A. Gamma rays

Answer 75

C. Microwaves

Answer 76

D. Gas welding

Answer 77

A. Anodising

Answer 78

B. Tempering

Answer 79

C. Carburising

Answer 80

D. Annealing

Answer 81

A. Is an electrical insulating material

Answer 82

B. Of low resistivity is preferred

Answer 83

C. Should have high thermal conductivity

Answer 84

D. Need not defy the corrosive action of chemicals

Answer 85

D. Aluminium

Answer 86

A. Boiling

Answer 87

B. Forced convection in air

Answer 88

C. Free convection in air

Answer 89

D. Conduction in air

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)

Correct Answer :

Show all Chemical Engineering Basics MCQ

Related Questions

The thermodynamic law, = constant, is not followed by the

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

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Also checkout

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)

Correct Answer :

Show all Chemical Engineering Basics MCQ

Related Questions

The thermodynamic law, = constant, is not followed by the

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

A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?

__________ remains constant during the adiabatic cooling of moist air.

Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of

Transformer cores are normally made from

Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans?

Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm.

The majority charge carriers in p-type silicon are

Multistage compression of air as compared to single stage compression offers the advantage of

Which of the following is prone to cup and cone fracture?

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__________ of test specimens is not involved in any hardness testing method.

Hot extrusion process is not used for making

The Al2O3 content of cryolite in Hall- Heroult cell is maintained between __________ percent.

Cementite is in the lamellar form in the __________ phase of steel.

Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?

The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.

Aluminium is extracted from

In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is

Which of the following approaches the ideal gas behaviour most closely?

The main constituent of bones is

Work done by a/an __________ process is determined by ∫p. dv

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Heat flow across a hollow sphere of inner radius 'r₁' and outer radius 'r₂' is directly proportional to