1
GATE ME 2011
MCQ (Single Correct Answer)
+2
-0.6
The temperature and pressure of air in a large reservoir are $$400$$ $$K$$ and $$3$$ bar respectively. A converging diverging nozzle of exit area $$0.005{m^2}$$ is fitted to the wall of the reservoir as shown in the figure. The static pressure of air at the exit section for isentropic flow through the nozzle is $$50$$ $$kPa.$$ The characteristic gas constant and the ratio of specific heats of air are $$0.287$$ $$kJ/kgK$$ and $$1.4$$ respectively.

The density of air in $$kg/{m^3}$$ at the nozzle exit is

A
$$0.560$$
B
$$0.600$$
C
$$0.727$$
D
$$0.800$$
2
GATE ME 2011
MCQ (Single Correct Answer)
+2
-0.6
The temperature and pressure of air in a large reservoir are $$400$$ $$K$$ and $$3$$ bar respectively. A converging diverging nozzle of exit area $$0.005{m^2}$$ is fitted to the wall of the reservoir as shown in the figure. The static pressure of air at the exit section for isentropic flow through the nozzle is $$50$$ $$kPa.$$ The characteristic gas constant and the ratio of specific heats of air are $$0.287$$ $$kJ/kgK$$ and $$1.4$$ respectively.

The mass flow rate of air through the nozzle in $$kg/s$$ is

A
$$1.30$$
B
$$1.77$$
C
$$1.85$$
D
$$2.06$$
3
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
A balloon containing an ideal gas is initially kept in an evacuated and insulated room. The balloon ruptures and the gas fills up the entire room. Which one of the following statements is TRUE at the end of above process?
A
The internal energy of the gas decreases from its initial value, but the enthalpy remains constant
B
The internal energy of the gas increases from its initial value, but the enthalpy remains constant
C
Both internal energy and enthalpy of the gas remain constant.
D
Both internal energy and enthalpy of the gas increase.
4
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
A rigid, insulated tank is initially evacuated. The tank is connected with a supply line through which air ( assumed to be ideal gas with constant specific heats) passes at $$1$$ $$MPa,$$ $${350^ \circ }C.$$ A valve connected with the supply line is opened and the tank is charged with air until the final pressure inside the tank reaches $$1$$ $$MPa.$$ The final temperature inside the tank.
A
Is greater than $${350^ \circ }C$$
B
Is less than $${350^ \circ }C$$
C
Is equal to $${350^ \circ }C$$
D
may be greater than less than, or equal to $${350^ \circ }C$$, depending on the volume of the tank.
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