1
GATE ME 2012
MCQ (Single Correct Answer)
+2
-0.6
Steam enters an adiabatic turbine operating at steady state with an enthalpy of $$3251.0kJ/kg$$ and leaves as a saturated mixture at $$15$$ $$kPa$$ with quality (dryness fraction ) $$0.9.$$ The enthalpies of the saturated liquid and vapour at $$15$$ $$kPa$$ are $${h_f} = 225.94kJ/kg$$ and $${h_g} = 2598.3kJ/kg$$ respectively. The mass flow rate of steam is $$10kg/s.$$ Kinetic and potential energy changes are negligible. The power output of the turbine in $$MW$$ is
A
$$6.5$$
B
$$8.9$$
C
$$9.1$$
D
$$27.0$$
2
GATE ME 2012
MCQ (Single Correct Answer)
+2
-0.6
Air enters an adiabatic nozzle at $$300$$ $$kPa,$$ $$500$$ $$K$$ with a velocity of $$10$$ $$m/s.$$ It leaves the nozzle at $$100$$ $$kPa$$ with a velocity of $$180$$ $$m/s.$$ The inlet area is $$80$$ $$c{m^2}.$$ The specific heat of air $${C_p}$$ is $$1008$$ $$J/kg.K.$$

The exit temperature of the air is

A
$$516$$ $$K$$
B
$$532$$ $$K$$
C
$$484$$ $$K$$
D
$$468$$ $$K$$
3
GATE ME 2012
MCQ (Single Correct Answer)
+2
-0.6
Air enters an adiabatic nozzle at $$300$$ $$kPa,$$ $$500$$ $$K$$ with a velocity of $$10$$ $$m/s.$$ It leaves the nozzle at $$100$$ $$kPa$$ with a velocity of $$180$$ $$m/s.$$ The inlet area is $$80$$ $$c{m^2}.$$ The specific heat of air $${C_p}$$ is $$1008$$ $$J/kg.K.$$

The exit area of the nozzle in $$c{m^2}$$ is

A
$$90.1$$
B
$$56.3$$
C
$$4.4$$
D
$$12.9$$
4
GATE ME 2012
MCQ (Single Correct Answer)
+2
-0.6
An ideal gas of mass $$m$$ and temperature $${T_1}$$ undergoes a reversible isothermal process from an initial pressure $${P_1}$$ to final pressure $$P{}_2.$$ The heat loss during the process is $$Q$$. The entropy changes $$\Delta S$$ of the gas is
A
$$mR\,\ln \left( {{{{P_2}} \over {{P_1}}}} \right)$$
B
$$mR\,\ln \left( {{{{P_1}} \over {{P_2}}}} \right)$$
C
$$mR\,\ln \left( {{{{P_2}} \over {{P_1}}}} \right) - {Q \over {{T_1}}}$$
D
zero
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