This set of Food Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Unit Operations – Heat Transfer by Conduction”.
1. 
‘a’ refers to ______ and ‘b’ refers to _____
a) Steady state heat transfer, Unsteady state heat transfer
b) Unsteady state heat transfer, Steady state heat transfer
c) None of the mentioned
d) All of the mentioned
View Answer
Explanation: ‘a’ refers to Steady state heat transfer and ‘b’ refers to unsteady state heat transfer.
2. The equation
3. Statement 1: The heat transfer co-efficient in ice is four times that of water.
Statement 2: k in conductance is for thermal conductivity.
a) True, False
b) True, True
c) False, False
d) False, True
View Answer
Explanation: Both the statements are true.
4. Frozen foods have a higher transfer co-efficient hence they lose heat faster than other food items when exposed to the outside environment.
a) True
b) False
View Answer
Explanation: Frozen foods have a higher transfer co-efficient hence they lose heat faster than other food items when exposed to the outside environment.
5. Statement 1: When the average radius gives an error, log mean radius is used.
Statement 2: Log mean radius is given by rL= ( r0– ri )/(ln(r0/ri))
a) True, False
b) True, True
c) False, False
d) False, True
View Answer
Explanation: Both the statements are true.
6. Statement 1: α=k/(ρCp)
Statement 2: α stands for thermal conductivity.
a) True, False
b) True, True
c) False, False
d) False, True
View Answer
Explanation: α=k/(ρCp). α stands for thermal diffusivity.
7. Statement 1: NFo stands for Fourier number.
Statement 2: NFo= (αtT)/s2
a) True, False
b) True, True
c) False, False
d) False, True
View Answer
Explanation: Both the statements pertaining to Fourier number are true.
8. NFo= (αtT)/s2. Here ‘s’ stands for half slab thickness. Based on this data, ‘s’ for a chapatti/ dosa will be _____
a) Half slab thickness
b) Full slab thickness
c) One and a half slab thickness
d) Double slab thickness
View Answer
Explanation: ‘s’ for a chapatti/ dosa will be Full slab thickness. This is because ‘s’ equals half slab thickness only when heating takes place from both sides. But, for a chapatti/ dosa, heating takes place only from one end hence‘s’ becomes ‘2s’.
9. _____ is the equation for unsteady state heat conduction through solid materials.
a) dT/dx= α (d2 T)/ (dt)2
b) dT/dx= α (d2 T)/ (dx)2
c) dT/dt= α (d2 T)/ (dx)2
d) dT/dt= α (d2 T)/ (dt)2
View Answer
Explanation: dT/dt= α (d2 T)/ (dx)2 is the equation for unsteady state heat conduction through solid materials.
10. For a copper pipe, k = 0.3534, temperature difference = 60, B = 0.0125 and A = 850. What is the value of q?
a) 1442 W
b) 1442 kW
c) 1565 W
d) 1565 kW
View Answer
Explanation: q=kA ∆T/B.
Sanfoundry Global Education & Learning Series – Food Engineering.
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