Air is flowing steadily in an insulated duct. The pressure and specific volume measurements of the air at two station A and B are

	Station A	Station B
Pressure	100 kPa	98 kPa
Specific volume	0.81 $m^3/kg$	0.97 $m^3/kg$

Take $C_p=1.005kJ/kgK;C_v=0.718kJ/kgK.$ What is direction of air flow in duct?

Q. The specific heat of air at constant pressure is $1.005kJ/kgK$ and the specific heat of air at constant volume is $0.718kJ/kgK$ .Find the specific gas constant.

Q. In an experimaental set-up, air flows between two stations $P$ and $Q$ adiabatically. The direction of flow depdns on the pressure and temperature conditions maintained at $P$ and $Q$. The conditions at $P$ are $150kPa$ and $35K$. The temperature at station $Q$ is $300K$. The following are the properties and relations pertaining to air:
Specific heat at constant pressure,
$c_p=1.005kG/kgK;$
Specific heat at constnat volume,
$c_v=0.718kJ/kgK;$
Characteristic gas constnat,
$R=0.287kJ/kgK$
Enthalpy, $h=c_{p}T.$
Internal energy, $u=c_{v}T.$

If the air has to flow from station $P$ to station $Q$, te maximum possible value of pressure in $kPa$ at station $Q$ is close to

Q.

In an experimaental set-up, air flows between two stations $P$ and $Q$ adiabatically. The direction of flow depdns on the pressure and temperature conditions maintained at $P$ and $Q$. The conditions at $P$ are $150kPa$ and $35K$. The temperature at station $Q$ is $300K$. The following are the properties and relations pertaining to air:
Specific heat at constant pressure,
$c_p=1.005kG/kgK;$
Specific heat at constnat volume,
$c_v=0.718kJ/kgK;$
Characteristic gas constnat,
$R=0.287kJ/kgK$
Enthalpy, $h=c_{p}T.$
Internal energy, $u=c_{v}T.$

If the pressure at station $Q$ is $50kPa,$ the change in entropy $(s_Q-s_P)$ in $kJ/kgK$ is

Q. $1m^3$ of ideal gas (air) at 12 kPa and ${100}^{\circ }C$ expands isentropically to 3kPa $C_p\text{of gas}=1.005kJ/kgK,C_v=0.718kJ/kgK,$ What is the final temperature of the gas $i{n}^{\circ }F$?

Q. The values of specific heats $C_p$ and $C_v$ for a gas are 1.00 kJ/ kgK and 0.75 kJ/ kgK respectively. The density of this gas in kg/m${}^3$ at 27°C and 1 bar absolute pressure is