Month: November 2020
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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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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…
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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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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…
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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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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…
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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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Throttling (Joule-Thomson effect) process is a constant __________ process.
A. Enthalpy B. Entropy C. Pressure D. None of these
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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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At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be
A. More B. Less C. Same D. More or less ; depending on the system