The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

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The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

A. Conduction

B. Convection

C. Radiation

D. None of these

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Depending on the radiating properties, a body will be black when

A. P = 0, x = 0 and a = 1

B. P= 1, T = 0 and a = 0

C. P = 0, x = 1 and a = 0

D. X = 0, a + p = 0 Where a = absorptivity, p = reflectivity, X = transmissivity.

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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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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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Thermal conductivity of water ________ with rise in temperature.

A. Remain same

B. Decreases

C. Increases

D. May increase or decrease depending upon temperature

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The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit

A. Temperature

B. Thickness

C. Area

D. Time

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Free convection flow depends on

A. Density

B. Coefficient of viscosity

C. Gravitational force

D. All of these

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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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Which of the following statement is correct?

A. A grey body is one which absorbs all radiations incident on it.

B. At thermal equilibrium, the emissivity and absorptivity are same.

C. The energy absorbed by a body to the total energy falling on it, is called emissivity.

D. A perfect body is one which is black in colour.

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The product of Reynolds number and Prandtl number is known as

A. Stanton number

B. Biot number

C. Peclet number

D. Grashoff number

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Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by

A. Convection

B. Radiation

C. Forced convection

D. Free convection

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The automobile radiator is a heat exchanger of

A. Parallel flow type

B. Counter flow type

C. Cross flow type

D. Regenerator type

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The ratio of the energy absorbed by the body to total energy falling on it is called

A. Absorptive power

B. Emissive power

C. Absorptivity

D. Emissivity

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Pick up the wrong case. Heat flowing from one side to other depends directly on

A. Face area

B. Time

C. Thickness

D. Temperature difference

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40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

A. 0.45

B. 0.55

C. 0.40

D. 0.75

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The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

A. Kirchoffs law

B. Stefan's law

C. Wien' law

D. Planck's law

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According to Wien's law, the wavelength corresponding to maximum energy is proportion to

A. Absolute temperature (T)

B. I²

C. F

D. T

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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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The unit of Stefan-Boltzmann constant is

A. Watt/mK

B. Watt/m²K²

C. Watt/m²K⁴

D. Watt/mK²

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A grey body is one whose absorptivity

A. Varies with temperature

B. Varies with the wave length of incident ray

C. Varies with both

D. Does not vary with temperature and wave length of the incident ray

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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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In a shell and tube heat exchanger, baffles are provided on the shell side to

A. Improve heat transfer

B. Provide support for tubes

C. Prevent stagnation of shell side fluid

D. All of these

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If the temperature of a solid surface changes from 27°C to 627°C, then its emissive power changes in the ratio of

A. 6

B. 9

C. 27

D. 81

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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 highest thermal diffusivity is of

A. Iron

B. Lead

C. Concrete

D. Wood

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The heat is transferred by conduction, convection and radiation in

A. Melting of ice

B. Boiler furnaces

C. Condensation of steam in condenser

D. None of these

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Depending on the radiating properties, body will be transparent when

A. P = 0, x = 0 and a = 1

B. P=1, x = 0, and a = 0

C. P = 0, T= 1, and a = 0

D. X = 0, a + p = 1

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Sensible heat is the heat required to

A. Change vapour into liquid

B. Change liquid into vapour

C. Increase the temperature of a liquid of vapour

D. Convert water into steam and superheat it

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In heat transfer, conductance equals conductivity (kcal/hr/sq.m/ °C/cm) divided by

A. Hr (time)

B. Sq. m (area)

C. °C (temperature)

D. K.cal (heat)

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In heat exchangers, degree of approach is defined as the difference between temperatures of

A. Cold water inlet and outlet

B. Hot medium inlet and outlet

C. Hot medium outlet and cold water inlet

D. Hot medium outlet and cold water outlet

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Heat transfer takes place as per

A. Zeroth law of thermodynamics

B. First law of thermodynamic

C. Second law of the thermodynamics

D. Kirchoff's law

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Accepted Answer

B. Convection

The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

Correct Answer :

Show all Heat & Mass Transfer MCQ

Related Questions

Depending on the radiating properties, a body will be black when

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

Heat flows from one body to other when they have

Thermal conductivity of water ________ with rise in temperature.

The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit

Free convection flow depends on

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

Which of the following statement is correct?

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Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by

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Pick up the wrong case. Heat flowing from one side to other depends directly on

40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

According to Wien's law, the wavelength corresponding to maximum energy is proportion to

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

The unit of Stefan-Boltzmann constant is

A grey body is one whose absorptivity

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)

In a shell and tube heat exchanger, baffles are provided on the shell side to

If the temperature of a solid surface changes from 27°C to 627°C, then its emissive power changes in the ratio of

The critical thickness of insulation for a sphere is

The highest thermal diffusivity is of

The heat is transferred by conduction, convection and radiation in

Depending on the radiating properties, body will be transparent when

Sensible heat is the heat required to

In heat transfer, conductance equals conductivity (kcal/hr/sq.m/ °C/cm) divided by

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Also checkout

The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

Correct Answer :

Show all Heat & Mass Transfer MCQ

Related Questions

Depending on the radiating properties, a body will be black when

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

Heat flows from one body to other when they have

Thermal conductivity of water ________ with rise in temperature.

The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit

Free convection flow depends on

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

Which of the following statement is correct?

The product of Reynolds number and Prandtl number is known as

Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by

The automobile radiator is a heat exchanger of

The ratio of the energy absorbed by the body to total energy falling on it is called

Pick up the wrong case. Heat flowing from one side to other depends directly on

40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

According to Wien's law, the wavelength corresponding to maximum energy is proportion to

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

The unit of Stefan-Boltzmann constant is

A grey body is one whose absorptivity

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)

In a shell and tube heat exchanger, baffles are provided on the shell side to

If the temperature of a solid surface changes from 27°C to 627°C, then its emissive power changes in the ratio of

The critical thickness of insulation for a sphere is

The highest thermal diffusivity is of

The heat is transferred by conduction, convection and radiation in

Depending on the radiating properties, body will be transparent when

Sensible heat is the heat required to

In heat transfer, conductance equals conductivity (kcal/hr/sq.m/ °C/cm) divided by

In heat exchangers, degree of approach is defined as the difference between temperatures of

Heat transfer takes place as per

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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)