# GATE Mechanical 2014 Set 4 | Question: 15

Match Group A with Group B:

$\begin{array}{|l|l|} \hline \textbf{Group A} & \textbf{Group B} \\ \hline \text{P: Biot number} & \text{1: Ratio of buoyancy to viscous force} \\ \hline \text{Q: Grashof number} & \text{2: Ratio of inertia force to viscous force} \\ \hline \text{R: Prandtl number} & \text{3: Ratio of momentum to thermal diffusivities} \\ \hline \text{S: Reynolds number} & \text{4: Ratio of internal thermal resistance to } \\ {} & \text{ boundary layer thermal resistance}\\ \hline \end{array}$

1. $P-4, Q-1, R-3, S-2$
2. $P-4, Q-3, R-1, S-2$
3. $P-3, Q-2, R-1, S-4$
4. $P-2, Q-1, R-3, S-4$

recategorized

## Related questions

Two infinite parallel plates are placed at a certain distance apart. An infinite radiation shield is inserted between the plates without touching any of them to reduce heat exchange between the plates. Assume that the emissivities of plates and radiation shield are equal. The ratio of the net heat exchange between the plates with and without the shield is $1/2$ $1/3$ $1/4$ $1/8$
Two identical metal blocks L and M (specific heat = $0.4$ $kJ/kg.K$), each having a mass of $5$ $kg$, are initially at $313$ $K$. A reversible refrigerator extracts heat from block L and rejects heat to block M until the temperature of block L reaches $293$ $K$. The final temperature (in $K$) of block M is _______
A plane wall has a thermal conductivity of $1.15$ $W/m.K$. If the inner surface is at $1100^{\circ} C$ and the outer surface is at $350^{\circ} C$, then the design thickness (in meter) of the wall to maintain a steady heat flux of $2500$ $W/m^2$ should be _______
Match the heat treatment processes (Group A) and their associated effects on properties (Group B) of medium carbon steel ... $P-II, Q-III, R-IV, S-I$ $P-III, Q-II, R-IV, S-I$ $P-II, Q-III, R-I, S-IV$
During $\textit{normalizing}$ process of steel, the specimen is heated between the upper and lower critical temperature and cooled in still air above the upper critical temperature and cooled in furnace above the upper critical temperature and cooled in still air between the upper and lower critical temperature and cooled in furnace