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Food Engineering and Heat Transfer Online Exam Quiz

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

In the below figure, ‘a’ refers to ______ and ‘b’ refers to _____.

Options

A : a. Steady state heat transfer, Unsteady state heat transfer

B : b. Unsteady state heat transfer, Steady state heat transfer

C : c. None of the mentioned

D : d. All of the mentioned

Y axis is the density function for volume fraction. X axis is F?. Curve a represents the microwave heating curve and curve b represents the conventional heating pattern. Which of the following statements are true for the below graph?

Options

A : a. Microwave heating shows a smaller spread hence more uniform heating

B : b. Heat transfer in microwave heating is faster than in conventional heating

C : c. Heat transfer in microwave heating is safer than in conventional heating

D : d. All of the mentioned

The x- axis is the moisture content on dry basis. The y-axis is the equilibrium moisture content. Which of the following shows Bound moisture content?

Options

A : a. AIEG

B : b. GIBF

C : c. GFHC

D : d. EGHD

X-axis is temperature and Y-axis is pressure. Which of the following curves is followed for freeze drying of prawns?

Options

A : a. AA’

B : b. BB’

C : c. ABO

D : d. A’OB’

The equation dq/dA= (k(-dT))/dx is called _____

Options

A : a. Kirchhoff’s law of conduction

B : b. Fourier’s law conduction

C : c. Kirchhoff’s & Fourier’s law conduction

D : d. None of the mentioned

Statement 1: The heat transfer co-efficient in ice is four times that of water. Statement 2: k in conductance is for thermal conductivity.

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

Frozen foods have a higher transfer co-efficient hence they lose heat faster than other food items when exposed to the outside environment.

Options

A : a. True

B : b. False

C : c. May be True or False

D : d. Can't say

Statement 1: When the average radius gives an error, log mean radius is used. Statement 2: Log mean radius is given by rL= ( r?– r? )/(ln(r?/r?))

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

Statement 1: ?=k/(?C?) Statement 2: ? stands for thermal conductivity.

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

Statement 1: NFo stands for Fourier number. Statement 2: NFo= (?t?)/s²

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

NFo= (?t?)/s². Here ‘s’ stands for half slab thickness. Based on this data, ‘s’ for a chapatti/ dosa will be _____

Options

A : a. Half slab thickness

B : b. Full slab thickness

C : c. One and a half slab thickness

D : d. Double slab thickness

_____ is the equation for unsteady state heat conduction through solid materials.

Options

A : a. dT/dx= ? (d²T)/ (dt)²

B : b. dT/dt= ? (d²T)/ (dx)²

C : c. dT/dt= ? (d²T)/ (dx)²

D : d. dT/dt= ? (d²T)/ (dt)²

For a copper pipe, k = 0.3534, temperature difference = 60, B = 0.0125 and A = 850. What is the value of q?

Options

A : a. 1442 W

B : b. 1442 kW

C : c. 1565 W

D : d. 1565 kW

Which of the following is true about Natural Convection?

Options

A : a. Low heat transfer

B : b. Due to gravity and natural buoyant forces

C : c. Dependent on viscosity, density and thermal conductivity

D : d. All of the mentioned

__________ is when nucleate boiling transforms to film boiling.

Options

A : a. Critical temperature

B : b. Leiden frost point

C : c. Critical temperature & Leiden frost point

D : d. None of the mentioned

Statement 1: Nucleate Boiling is when a layer of film is formed in the beginning. Statement 2: Boiling starts with the bottom layer which heats up, becomes light and goes up. That way everything becomes hot and there is not temperature difference and hence no heat transfer.

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

Statement 1: When heat transfer takes between a solid surface and a fluid, an insulating film layer is formed. More is the agitation; more is the thickness of the film. Statement 2: Within the film, the temperature varies from the wall to the temperature of the bulk.

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

Statement 1: N??= (C??)/k Statement 2: If N?? is lesser than 1, Thermal Boundary layer is thinner than Hydrodynamic Boundary layer.

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

Why is better to use a Jacketed vessel in the dairy industry than a stainless steel container directly?

Options

A : a. To prevent milk from charring

B : b. To have a better temperature control

C : c. The temperature of food in the film = temperature of the wall which is very high. Hence, jacketed vessels are needed

D : d. All of the mentioned

Statement 1: hd/k is _____ Statement 2: _____ is the ratio of convective heat transfer to conductive heat transfer.

Options

A : a. Prandtl number, Prandtl number

B : b. Nussel number, Nussel number

C : c. Pictet number, Pictet number

D : d. Fourier number, Fourier number

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