Joule-Thomson effect i.e., a throttling process is a constant __________ process.
A. Entropy
B. Temperature
C. Internal energy
D. Enthalpy
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Throttling (Joule-Thomson effect) process is a constant __________ process.
A. Enthalpy
B. Entropy
C. Pressure
D. None of these
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A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?
A. Vapor compression cycle using expansion valve
B. Air refrigeration cycle
C. Vapor compression cycle using expansion engine
D. Carnot refrigeration cycle
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A nozzle is a device, which
A. Increases kinetic energy and decreases pressure
B. Reduces kinetic energy and increases pressure
C. Reduces both kinetic energy and pressure
D. Increases both kinetic energy and pressure
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The first law of thermodynamics is a statement of conservation of
A. Heat
B. Momentum
C. Energy
D. Work
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The total change in the enthalpy of a system is independent of the
A. Number of intermediate chemical reactions involved
B. Pressure and temperature
C. State of combination and aggregation in the beginning and at the end of the reaction
D. None of these
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All gases above its inversion temperature, in a throttling process will show
A. A heating effect
B. No change in temperature
C. A cooling effect
D. Either A or C
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Which of the following is an undesirable characteristics of a refrigerant ?
A. It should be non-explosive
B. It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
C. Its vapor pressure at the condenser temperature should be very high
D. None of these
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The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the
A. Lewis-Randall rule
B. Statement of Vant-Hoff equation
C. Le-Chatelier's principle
D. None of these
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Linde gas liquefaction process employs cooling
A. By throttling
B. By expansion in an engine
C. At constant pressure
D. None of these
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Claude gas liquefaction process employs cooling
A. At constant pressure
B. By throttling
C. By expansion in an engine
D. None of these
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Air-refrigeration cycle
A. Is the most efficient of all refrigeration cycles
B. Has very low efficiency
C. Requires relatively large quantities of air to achieve a significant amount of refrigeration
D. Both B and C
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The quantitative effect of temperature on chemical equilibrium is given by the
A. Vant-Hoff equation
B. Le-Chatelier's principle
C. Arhenius equation
D. None of these
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The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the __________ equation.
A. Gibbs-Duhem
B. Van Laar
C. Gibbs-Helmholtz
D. Margules
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Enthalpy of a gas depends upon its
A. Temperature
B. Mass
C. Volume
D. Pressure
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The Joule-Thomson co-efficient is defined as ( ∂ P ∂ T ) H . Its value at the inversion point is
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The compressibility factor for an ideal gas is 1. Its value for any other real gas is
A. 1
B. < 1
C. > 1
D. Either (b) or (c), depends on the nature of the gas
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Pick out the correct statement.
A. A real gas on expansion in vacuum gets heated up
B. An ideal gas on expansion in vacuum gets cooled
C. An ideal gas on expansion in vacuum gets heated up
D. A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected
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An irreversible process
A. Is the analog of linear frictionless motion in machines
B. Is an idealised visualisation of behaviour of a system
C. Yields the maximum amount of work
D. Yields an amount of work less than that of a reversible process
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Solid and liquid phases of a substance are in equilibrium at the
A. Critical temperature
B. Melting point
C. Freezing point
D. Both B and C
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