# Electrical Analogy to Heat Flow - MCQs with Answers

## Electrical Analogy to Heat Flow - MCQs with Answers

Q1. The current in the electrical system is analogous to

a. the temperature in the heat transfer system
b. the heat flow in the heat transfer system
c. the thermal conductance in the heat transfer system
d. the thermal resistance in the heat transfer system

ANSWER: b. the heat flow in the heat transfer system

Q2. The term in the heat transfer system which is analogous to the electrical resistance is called as

a. thermal resistance
b. conductive resistance
c. potential resistance
d. none of the above

Q3. What will be the simple correct formula for the rate of heat flow (q) through a wall of surface area A and thickness of t ? The two surfaces of the wall are at temperatures T1 and T2 (T1>T2). Consider thermal resistance for the heat transfer system as Rh.

a. q = Rh (T1 – T2)
b. q = Rh A (T1 – T2)
c. q = (T1 – T2) / Rh
d. q = Rh A ((T1 – T2) / t)

ANSWER: q = (T1 – T2) / Rh

Q4. Consider the heat is transferred through a wall of surface area A and thickness t at the rate of q, what is the thermal resistance of the system ? The thermal conductivity of the wall is k and the heat is transferred normal to the surface area A.

a. kA
b. 1 / kA
c. kAt
d. t / kA

Q5. The potential difference in an electrical system, is analogously considered as

a. a temperature difference in the heat transfer system
b. a current flow in the heat transfer system
c. a resistance in the heat transfer system
d. none of the above