ENGINEERING THERMODYNAMICS QUIZ

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

v2/v1

(v1 + v2)/v2

(v1 + v2)/v1

v1/v2

TRUE ANSWER : ?
YOUR ANSWER : ?

According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as

None of these

Temperature

Volume, if temperature is kept constant

Absolute temperature, if volume is kept constant

TRUE ANSWER : ?
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Those substances which have so far not been resolved by any means into other substances of simpler form are called

Compounds

Elements

Atoms

Molecules

TRUE ANSWER : ?
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The heat and mechanical energies are mutually convertible. This statement was established by

Boyle

Joule

Charles

None of these

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The compression ratio for Diesel engines is

5 to 8

15 to 20

20 to 30

3 to 6

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The entropy __________ in an irreversible cyclic process.

Decreases

None of these

Increases

Remains constant

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General gas equation is

PV=nRT

PV=mRT

PV=KiRT

PV = C

TRUE ANSWER : ?
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Carnot cycle efficiency is maximum when

Difference between initial and final temperature is 0°K

Final temperature is 0°C

Initial temperature is 0°K

Final temperature is 0°K

TRUE ANSWER : ?
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A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

Isothermal process

Polytropic process

Hyperbolic process

Adiabatic process

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Select the wrong statement

A Joule cycle consists of two constant volume and two isentropic processes.

All of these

An Ericsson cycle consists of two constant pressure and two isothermal processes.

An Otto cycle consists of two constant volume and two isentropic processes.

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