# Heat Transfer MCQ’s – Model Studies and Similitude

1 - Question

Which is a full size structure employed in the actual engineering design?
a) Proton
b) Prototype
c) Electron
d) Neutron
Explanation: The prototype operates under the actual working conditions.

2 - Question

Which term refers to the theory and art of predicting prototype conditions from model observations?
a) Nusselt number
b) Dimensional homogeneity
c) Thermal boundary layer
d) Similitude
Explanation: It prescribes the relationship between a full scale flow and a flow involving smaller but geometrically similar boundaries.

3 - Question

The results obtained from experiments on models can be applied to prototype only if a complete similarity exists between the model and prototype and for that the two systems may be (i) Geometrically similar (ii) Kinematically similar (iii) Dynamically similar Identify the correct statements
a) i and ii
b) ii and iii
c) i, ii and iii
d) i and iii
Explanation: It should be geometrically, cinematically and dynamically similar

4 - Question

Geometrically similarity prescribes that the ratio of the corresponding linear dimensions of the two systems are
a) Unity
b) Same
c) Never same
d) May be twice
Explanation: It refers to the similarity of shape and form.

5 - Question

Thermal similarity refers to the comparison of two systems made on the basis of their
a) Temperature
b) Specific heat
c) Heat flux
d) Length
Explanation: A similarity in thermal quantities is achieved when Prandtl number is same for both the fields.

6 - Question

The comparison of two systems made on the basis of their temperature, specific heat and heat flu is known as
a) Dynamic similarity
b) Kinematic similarity
c) Thermal similarity
d) Geometrical similarity
Explanation: It is known as thermal similarity.

7 - Question

The similarity of masses and forces of the corresponding particles of flow is known as
a) Kinematic similarity
b) Dynamic similarity
c) Geometrical similarity
d) Thermal similarity
Explanation: Systems are dynamically similar if the corresponding particles experience the similar force.

8 - Question

The similarity of motion is known as
a) Thermal similarity
b) Dynamic similarity
c) Geometrical similarity
d) Kinematic similarity
Explanation: Both the systems undergo similar rates of change of motion.

9 - Question

The similarity of shape and form is known as
a) Geometrical similarity
b) Thermal similarity
c) Geometrical similarity
d) Kinematic similarity
Explanation: They may differ in size but are identical in shape.

10 - Question

A similarity in thermal quantities is achieved when
a) Nusselt number is same for both the fields
b) Nusselt number is different for both the fields
c) Prandtl number is same for both the fields
d) Prandtl number is different for both the fields