ISRO Scientist or Engineer Mechanical 2006

$$N_u = CR_{e}^{m} P_{r}^{n}$$ represents heat transfer under

If the inner and oute r surfaces of a hollow cylinder (having radii $$r_1 and r_2$$ and length L) are at temperatures $$t_1 and t_2$$ then rate of radial heat flow will be

For infinite parallel planes with emissivities $$\epsilon_1 and \epsilon_2,$$ the interchange factor for radiation from surface 1 to surface 2 is given by

For a closed system, difference between the heat added to the system and work done by the gas, is equal to the change in

The condition for reversibility of a cycle is

The state of a real gas if changed from pressure $$P_1,$$ temperature $$T_1$$ to pressure $$P_2$$ temperature $$T_2.$$ The change in enthalpy, $$h_2 - h_1,$$ is given by

One hundredth of a kilogram of air is compressed in a piston-cylinder device. At an instant of time when T = 400 K, the rate at which work is being done on the air is 8.165 kW, and heat is being removed at a rate of 1.0 kW, the rate of temperature rise will be

The volume V versus temperature T graphs for a certain amount of a perfect gas at two pressure $$P_1 and P_2$$ are as shown in the figure. It can be concluded that

In the polytropic process $$pv^n$$ = Constant,if n = 1 the process will be at

In case of ideal triatomic gas,the ratio of specific heats $$\frac{C_p}{C_v} would be