Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

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Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

A. S.H/(S.H + L.H)

B. (S.H + L.H) /S.H

C. (L.H - S.H)/S.H

D. S.H/(L.H - S.H)

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Thermal diffusivity of a substance is

A. Directly proportional to the thermal conductivity

B. Inversely proportional to density of substance

C. Inversely proportional to specific heat

D. All of the above

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Thermal conductivity of a material may be defined as the

A. Quantity of heat flowing in one second through one cm cube of material when opposite faces ^re maintained at a temperature difference of 1°C

B. Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

C. Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

D. All of the above

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According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

A. Grey body

B. Brilliant white polished body

C. Red hot body

D. Black body

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Fouling factor is used

A. In heat exchanger design as a safety factor

B. In case of Newtonian fluids

C. When a liquid exchanges heat with a gas

D. None of the above

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The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

A. Move actually

B. Do not move actually

C. Affect the intervening medium

D. Does not affect the intervening medium

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Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

A. S.H/(S.H + L.H)

B. (S.H + L.H) /S.H

C. (L.H - S.H)/S.H

D. S.H/(L.H - S.H)

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Unit of thermal diffusivity is

A. m²/hr

B. m²/hr °C

C. kcal/m² hr

D. kcal/m. hr °C

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Log mean temperature difference in case of counter flow compared to parallel flow will be

A. Same

B. More

C. Less

D. Depends on other factors

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Reynolds number is the ratio of

A. Energy transferred by convection to that by conduction

B. Kinematic viscosity to thermal diffusivity

C. Inertia force to viscous force

D. None of the above

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The concept of overall coefficient of heat transfer is used in case of heat transfer by

A. Conduction

B. Convection

C. Radiation

D. Conduction and convection

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All radiations in a black body are

A. Reflected

B. Refracted

C. Transmitted

D. Absorbed

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A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

A. k₁ k₂

B. (k₁ + k₂)

C. (k₁ + k₂)/ k₁ k₂

D. 2 k₁ k₂/ (k₁ + k₂)

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Which of the following statement is wrong?

A. The heat transfer in liquid and gases takes place according to convection.

B. The amount of heat flow through a body is dependent upon the material of the body.

C. The thermal conductivity of solid metals increases with rise in temperature

D. Logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference.

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The critical thickness of insulation for a sphere is

A. k/h₀

B. 2k/h₀

C. h₀/k

D. h₀/2k

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The expression Q = ρ AT⁴ is called

A. Fourier equation

B. Stefan-Boltzmann equation

C. Newton Reichmann equation

D. Joseph-Stefan equation

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The insulation ability of an insulator with the presence of moisture would

A. Increase

B. Decrease

C. Remain unaffected

D. May increase/decrease depending on temperature and thickness of insulation

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Thermal conductivity of water at 20°C is of the order of

A. 0.1

B. 0.23

C. 0.42

D. 0.51

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The rate of energy transferred by convection to that by conduction is called

A. Stanton number

B. Nusselt number

C. Biot number

D. Peclet number

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Upto the critical radius of insulation,

A. Added insulation will increase heat loss

B. Added insulation will decrease heat loss

C. Convective heat loss will be less than conductive heat loss

D. Heat flux will decrease

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The logarithmic mean temperature difference (t_m) is given by (where Δt₁ and Δt₂ are temperature differences between the hot and cold fluids at entrance and exit)

A. t_m = (Δt₁ - Δt₂)/ log_e (Δt₁/Δt₂)

B. t_m = log_e (Δt₁/Δt₂)/ (Δt₁ - Δt₂)

C. t_m = t_m = (Δt₁ - Δt₂) log_e (Δt₁/Δt₂)

D. t_m = log_e (Δt₁ - Δt₂)/ Δt₁/Δt₂

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The heat transfer takes place according to

A. Zeroth law of thermodynamics

B. First law of thermodynamics

C. Second law of thermodynamics

D. Kirchhoff's law

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According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

A. Directly proportional to the surface area

B. Directly proportional to the difference of temperatures between the two bodies

C. Either (A) or (B)

D. Both (A) and (B)

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Heat flows from one body to other when they have

A. Different heat contents

B. Different specific heat

C. Different atomic structure

D. Different temperatures

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According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

A. Pb = pa - pv

B. Pb = pa + pv

C. Pb = pa × pv

D. Pb = pa/pv

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Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

A. h = k/ ρS

B. h = ρS/k

C. h = S/ρk

D. h = kρ/S

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The unit of overall coefficient of heat transfer is

A. kcal/m²

B. kcal/hr °C

C. kcal/m² hr °C

D. kcal/m hr °C

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According to Prevost theory of heat exchange

A. It is impossible to transfer heat from low temperature source to t high temperature source

B. Heat transfer by radiation requires no medium

C. All bodies above absolute zero emit radiation

D. Heat transfer in most of the cases takes place by combination of conduction, convection and radiation

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The unit of Stefan Boltzmann constant is

A. Watt/cm² °K

B. Watt/cm4 °K

C. Watt²/cm °K⁴

D. Watt/cm² °K⁴

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The energy distribution of an ideal reflector at higher temperatures is largely in the range of

A. Shorter wavelength

B. Longer wavelength

C. Remain same at all wavelengths

D. Wavelength has nothing to do with it

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The ratio of surface convection resistance to the internal conduction resistance is known as

A. Grashoff number

B. Biot number

C. Stanton number

D. Prandtl number

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Accepted Answer

A. S.H/(S.H + L.H)

Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

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Related Questions

Thermal diffusivity of a substance is

Thermal conductivity of a material may be defined as the

According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Fouling factor is used

The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

Unit of thermal diffusivity is

Log mean temperature difference in case of counter flow compared to parallel flow will be

Reynolds number is the ratio of

The concept of overall coefficient of heat transfer is used in case of heat transfer by

All radiations in a black body are

A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

Which of the following statement is wrong?

The critical thickness of insulation for a sphere is

The expression Q = ρ AT⁴ is called

The insulation ability of an insulator with the presence of moisture would

Thermal conductivity of water at 20°C is of the order of

The rate of energy transferred by convection to that by conduction is called

Upto the critical radius of insulation,

The logarithmic mean temperature difference (t_m) is given by (where Δt₁ and Δt₂ are temperature differences between the hot and cold fluids at entrance and exit)

The heat transfer takes place according to

According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Heat flows from one body to other when they have

According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

The unit of overall coefficient of heat transfer is

According to Prevost theory of heat exchange

The unit of Stefan Boltzmann constant is

The energy distribution of an ideal reflector at higher temperatures is largely in the range of

The ratio of surface convection resistance to the internal conduction resistance is known as

Also checkout

Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

Correct Answer :

Show all Heat & Mass Transfer MCQ

Related Questions

Thermal diffusivity of a substance is

Thermal conductivity of a material may be defined as the

According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Fouling factor is used

The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

Unit of thermal diffusivity is

Log mean temperature difference in case of counter flow compared to parallel flow will be

Reynolds number is the ratio of

The concept of overall coefficient of heat transfer is used in case of heat transfer by

All radiations in a black body are

A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

Which of the following statement is wrong?

The critical thickness of insulation for a sphere is

The expression Q = ρ AT4 is called

The insulation ability of an insulator with the presence of moisture would

Thermal conductivity of water at 20°C is of the order of

The rate of energy transferred by convection to that by conduction is called

Upto the critical radius of insulation,

The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)

The heat transfer takes place according to

According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Heat flows from one body to other when they have

According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

The unit of overall coefficient of heat transfer is

According to Prevost theory of heat exchange

The unit of Stefan Boltzmann constant is

The energy distribution of an ideal reflector at higher temperatures is largely in the range of

The ratio of surface convection resistance to the internal conduction resistance is known as

Also checkout

The expression Q = ρ AT⁴ is called

The logarithmic mean temperature difference (t_m) is given by (where Δt₁ and Δt₂ are temperature differences between the hot and cold fluids at entrance and exit)