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Heat Transfer Basics Online Exam Quiz

Important questions about Heat Transfer Basics. Heat Transfer Basics MCQ questions with answers. Heat Transfer Basics exam questions and answers for students and interviews.

The following equation, corresponds to __________ analogy.

Options

A : a. Von-Karmann

B : b. Reynolds

C : c. Colburn

D : d. Prandtl

Out of the following four assumptions used in the derivation of the equation for LMTD given by below equation, which one is subject to the largest deviation in practice ?

Options

A : a. Constant overall heat transfer co-efficient.

B : b. Constant rate of fluid flow.

C : c. Constant specific heat.

D : d. No partial phase change in the system.

For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

Options

A : a. A

B : b. B

C : c. C

D : d. D

The Dietus-Boelter equation for convective heat transfer given by following equation, cannot be used for

Options

A : a. low Reynold's number

B : b. very low Grashoff number

C : c. molten metals

D : d. all (a), (b) and (c)

The rate of heat transfer through a pipe wall is given by following equation. For cylinder of very thin wall, q can be approximated by

Options

A : a. A

B : b. B

C : c. C

D : d. D

At steady state the temperature variation in a plane wall, made of two different solids I & II is shown below. The thermal conductivity of material I

Options

A : a. is smaller than that of II.

B : b. is greater than that of II.

C : c. is equal to that of II.

D : d. can be greater than or smaller than that of II.

In case of surface condensers, a straight line is obtained on plotting 1/U vs __________ on an ordinary graph paper.

Options

A : a. A

B : b. B

C : c. C

D : d. D

Fouling factor for a heat exchanger is given by (where, U? = heat transfer co-efficient of dirty surface U? = heat transfer co-efficient of clean surface)

Options

A : a. A

B : b. B

C : c. C

D : d. D

For a counter current heat exchanger with Tih = 80°C, T°c = 60°C, T°h = 50°C and Tic = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy

Options

A : a. A

B : b. B

C : c. C

D : d. D

Following number is called the __________ number.

Options

A : a. Peclet

B : b. Stanton

C : c. Graetz

D : d. none of these

The following equation is the __________ analogy.

Options

A : a. Colburn

B : b. Reynolds

C : c. Prandtl

D : d. None of these

The number given below is termed as the __________ number.

Options

A : a. Grashoff

B : b. Nusselt

C : c. Prandtl

D : d. Stanton

Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by following equation. This is valid for the value of NRe equal to

Options

A : a. < 2100

B : b. 2100-4000

C : c. > 4000

D : d. > 10000

Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

Options

A : a. 32

B : b. 37

C : c. 45

D : d. 50

A process stream of dilute aqueous solution flowing at the rate of10 Kg.s?¹ is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s?¹. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is

Options

A : a. counter flow with process stream on shell side.

B : b. counter flow with process stream on tube side.

C : c. parallel flow with process stream on shell side.

D : d. parallel flow with process stream on tube side.

A 10 cm diameter steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

Options

A : a. greater than that for uninsulated steam pipe.

B : b. less than that of the uninsulated steam pipe.

C : c. equal to that of the uninsulated steam pipe.

D : d. less than the steam pipe with 5 cms insulation.

The thermal radiation emitted by a body is proportional to T?, where T is its absolute temperature. The value of 'n' is exactly 4 for

Options

A : a. black painted bodies only

B : b. all bodies

C : c. polished bodies only

D : d. a black body

LMTD for counterflow and prallel flow heat exchanger will be the same, when the

Options

A : a. cold fluid is heated to a certain temperature by condensing steam (isothermal fluid).

B : b. outlent temperature of both the hot and cold fluid are same.

C : c. outlet temperature of hot fluid is less than the outlet temperature of the cold fluid.

D : d. none of these.

The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation.

Options

A : a. increases

B : b. decreases

C : c. remains constant

D : d. may increase or decrease ; depends on the material

Stefan-Boltzman law applies to __________ body.

Options

A : a. black

B : b. white

C : c. grey

D : d. any colour

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