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Engineering Thermodynamics

Engineering Thermodynamics
The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)

(v1 + v2)/v1
v2/v1
(v1 + v2)/v2
v1/v2

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Engineering Thermodynamics
For the same compression ratio, the efficiency of dual combustion cycle is

Greater than Diesel cycle and less than Otto cycle
Less than Diesel cycle and greater than Otto cycle
Less than Diesel cycle
Greater than Diesel cycle

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Engineering Thermodynamics
Temperature of a gas is produced due to

Surface tension of molecules
Its heating value
Repulsion of molecules
Kinetic energy of molecules

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Engineering Thermodynamics
The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as

Atom
Molecule
Element
Compound

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Engineering Thermodynamics
When a gas is heated at constant volume

Its pressure will increase
Its temperature will increase
Both temperature and pressure will increase
Neither temperature nor pressure will increase

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Engineering Thermodynamics
If a system after undergoing a series of processes, returns to the initial state then

Sum of heat and work transfer will be zero
Process is executed in closed system cycle
Process is thermodynamically in equilibrium
Its entropy will change due to irreversibility

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