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GATE ME: Thermal Science Champion Quiz 2

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Question 1

Heat transfer takes place as per the law is known as

Question 2

If a system undergoes an irreversible adiabatic process, then (symbols have usual meanings)

Question 3

At the time of starting, idling and low speed operation, the carburetor supplies a mixture which can be termed as ____________.

Question 4

In the polytropic process pvⁿ = Constant, if n = 1 the process will be at ( for an ideal gas )

Question 5

The following four figures have been drawn to represent a fictitious thermodynamics cycle, on the p-v and T-s planes.
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$Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE ME 18-Mar\GATE-ME-2005_files\image036.png$
According to the first law of thermodynamics, equal areas are enclosed by

Question 6

Air at 327°C and 400 kPa with a volume flow rate of 5 m³/s flows through a turbine and exits at 100 kPa and 182°C. If the expansion process is polytropic, calculate rate of change in entropy (specific heat at constant pressure of air = 1.0035 kJ/kg-K, and Gas Constant of air = 0.287 kJ/kg-K).

Question 7

Water has a critical specific volume of 0.003155m³ /kg. A closed and rigid steel tank of volume 0.025 m³ contains a mixture of water and steam at 0.1 MPa. The mass of the mixture is 10 kg. The tank is now slowly heated. The liquid level inside the tank

Question 8

A well-insulated rigid container of volume 1 m³ contains 1.0 kg of an ideal gas [C_p = 1000 J/(kg.K) and C_v = 800 J/(kg.K)] at a pressure of 10² kPa. A stirrer is rotated at constant rpm in the container for 1000 rotations and the applied torque is 100 N-m. The final temperature of the gas (in K) is

Question 9

One kg of air (R = 287 J/kg-K) undergoes an irreversible process between equilibrium state 1 (20 °C , 0.9 m³) and equilibrium state 2 (20 °C, 0.6 m³) The change in entropy S₂ - S₁ (in J/kg-K) is_____?

Question 10

2 moles of oxygen are mixed adiabatically with another 2 moles of oxygen in a mixing chamber, so that the final total pressure and temperature of the mixture become same as those of the individual constituents at their initial states. The universal gas constant is given as R. The change in entropy due to mixing, per mole of oxygen, is given by __________.

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ESE & GATE ME Thermodynamics

Apr 6ESE & GATE ME