GATE XE purpose:exam-prep PYQs & Answers — Page 100

Questions 991–1000 of 1772. Imported answers require independent review unless marked reviewed.

For a real gas passing through an insulated throttling valve, the outlet temperature of the gas __________ with respect to the inlet temperature.

Your answerChoose one option.

is always higher

is always lower

may be higher, lower or same

is always same

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Atmospheric air with Dry Bulb Temperature (DBT) of 24°C and Relative Humidity of 35%, entering in a circular duct (assume no pressure drop in the duct) is heated by an electrical resistance arrangement inside the duct. The DBT of air measured at the outlet of the duct is equal to 30°C. Considering the flow to be steady, which of the following statements(s) is (are) correct as regards to the outlet air, with respect to the inlet air?

Your answerSelect all correct options. You can choose more than one.

There is no change in the Relative Humidity

There is no change in the Dew Point Temperature

There is no change in the Specific Humidity

There is no change in the Specific Enthalpy

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A cylinder of volume 1 m

contains a mixture of CO

(20% by mol) and O

(80% by mol) at 100 kPa and 300 K. This cylinder is connected to a 1 MPa pressure line carrying N

at 300 K. The cylinder is filled isothermally till the pressure of gas mixture inside becomes 500 kPa, and then the filling is stopped. The amount of N

gas that has entered the cylinder is __________ (in mole, 2 decimal places). The universal gas constant is 8.3145 J/(mol K).

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The saturation pressure

of a pure liquid is represented by an equation of the form:

, where, A and B are constants, and T is the absolute temperature. For this substance, which of the following expression for specific entropy difference between the saturated vapour and the saturated liquid phase (

) is correct? Note: Subscripts

and

refer to saturated liquid and saturated vapour phases, respectively, and

is the specific volume difference between the saturated vapour and the saturated liquid phases.

Your answerChoose one option.

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For a refrigeration cycle, the ratio of actual COP to the COP of a reversible refrigerator operating between the same temperature limits is 0.8. The condenser and evaporator temperatures are 5°C and −30°C, respectively. If the cooling capacity of the plant is 2.4 kW, then the power input to the refrigerator is: (COP: Coefficient of Performance)

Your answerChoose one option.

1.00 kW

1.33 kW

1.25 kW

2.08 kW

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Two identical pressure cookers, Cooker A and Cooker B, each having a total internal capacity of 6 litres are available. Cooker A is filled with 2 litres of liquid water at 110°C and Cooker B is filled with 4 litres of liquid water at 110°C. The remaining space in both the cookers is filled with saturated water vapour in equilibrium with the liquid water. If

represents the specific Gibbs free energy, and subscripts

and

represent the saturated vapour and the saturated liquid phases, respectively, which of the following expressions is correct?

Diagram for Engineering Sciences question 12

Your answerChoose one option.

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Four different Entropy (S) - Temperature (T) diagrams, representing liquid to vapour phase transition process of a pure substance in a closed system under constant pressure are shown. The diagram, which correctly represents the process, is:

Your answerChoose one option.

Diagram for Engineering Sciences question 13

Diagram for Engineering Sciences question 13 (figure 2)

Diagram for Engineering Sciences question 13 (figure 3)

Diagram for Engineering Sciences question 13 (figure 4)

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Air having a mass flow rate of 2 kg/s enters a diffuser at 100 kPa and 30°C, with a velocity of 200 m/s. Exit area of the diffuser is 400 cm² while the exit temperature of the air is 45°C. The rate of heat loss from the diffuser to the surrounding is 8 kJ/s. The pressure at the diffuser exit is __________ kPa (2 decimal places).

For air, the characteristic gas constant is 287 J/(kgK) and specific heat capacity at constant pressure is 1005 J/(kgK). Assume air to be an ideal gas and the flow in the diffuser is steady.

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For the Refrigerant R-134 (at 1 MPa and 50°C), the difference between the specific volume computed by assuming it to be an ideal gas and its actual specific volume is:

. If the compressibility factor associated with this state is

, then

__________

m³/kg (3 decimal places).

Here

is the specific volume calculated using the compressibility factor.

For Refrigerant R-134 (at 1 MPa and 50°C): The characteristic gas constant: 0.0815 kJ/(kgK), The critical pressure and temperature are, respectively,

MPa and

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A mixture of air and water vapour enters a steady-flow adiabatic saturator at 50°C and 100 kPa. It leaves the saturator in a completely saturated state at temperature of 25°C and pressure of 100 kPa. Liquid water enters the saturator at 25°C. If air is considered to be an ideal gas, with constant specific heat capacity, the relative humidity of the air entering the saturator is __________ % (1 decimal place).

Use the following data:

at 25°C

kJ/kg,

kPa

at 50°C

kJ/kg,

kPa

Specific heat capacity of air at constant pressure

kJ/(kgK)

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GATE XE purpose:exam-prep PYQs

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