Dimensional Analysis(Heat Transfer ) Questions and Answers
Question 1. Ratio of actual velocity to sonic velocity is known as
Mach number
Peclet number
Reynolds number
Grashof number
Explanation:-
Answer: Option A. -> Mach number Answer: (a).Mach number
Question 2. Let us say Mach number (greater than one), the flow is
Sonic
Subsonic
Supersonic
No flow
Explanation:-
Answer: Option C. -> Supersonic Answer: (c).Supersonic
Question 3. Free convection heat flow does not depends on
Density
Coefficient of viscosity
Gravitational force
Velocity
Explanation:-
Answer: Option B. -> Coefficient of viscosity Answer: (b).Coefficient of viscosity
Question 4. The value of Prandtl number for air is about
0.1
0.4
0.7
1.1
Explanation:-
Answer: Option C. -> 0.7 Answer: (c).0.7
Question 5. Which dimensionless number has a significant role in forced convection?
Prandtl number
Peclet number
Mach number
Reynolds number
Explanation:-
Answer: Option D. -> Reynolds number Answer: (d).Reynolds number
Question 6. The non-dimensional parameter known as Stanton number is used in
Forced convection heat transfer
Condensation heat transfer
Natural convection heat transfer
Unsteady state heat transfer
Explanation:-
Answer: Option A. -> Forced convection heat transfer Answer: (a).Forced convection heat transfer
Question 7. Heat is loss from a 100 mm diameter steam pipe placed horizontally in ambient air at 30 degree Celsius. If the Nusselt number is 25 W/m² K and thermal conductivity of the air is 0.03 W/m K, then heat transfer coefficient will be
7.5 W/m² K
16.5 W/m² K
25 W/m² K
30 W/m² K
Explanation:-
Answer: Option A. -> 7.5 W/m² K Answer: (a).7.5 W/m² K
Question 8. The Prandtl number will be lowest for
Water
Liquid metal
Lube oil
Aqueous solution
Explanation:-
Answer: Option B. -> Liquid metal Answer: (b).Liquid metal
Question 9. The dimensionless parameter l³ p² β g d t/µ² is referred to as
Stanton number
Schmidt number
Grashof number
Peclet number
Explanation:-
Answer: Option C. -> Grashof number Answer: (c).Grashof number
Question 10. Ratio of inertia force to viscous force is known as
Grashof number
Reynolds number
Peclet number
Stanton number
Explanation:-
Answer: Option B. -> Reynolds number Answer: (b).Reynolds number