Thermodynamics Mcqs

This set of Mechanical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Thermodynamics ”. These questions are chosen from a collection of most authoritative and best reference books on Mechanical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Thermodynamics comprehensively.

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31.
A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be___________________?

300 Nm

300,000 Nm

30 Nm

3000 Nm

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32.
Entropy change depends on___________________?

Heat transfer

Mass transfer

Change of temperature

Thermodynamic state

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33.
Energy can neither be created nor destroyed but can be converted from one form to other is inferred from_________________?

Zeroth low of thermodynamic

First law of thermodynamics

Second law to thermodynamics

Basic law of thermodynamics

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34.
Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant________________?

Pressure

Temperature

Volume

Internal energy

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35.
Isochoric process is one in which___________________?

Free expansion takes place

Very little mechanical work is done by the system

No mechanical work is done by the system

All parameters remain constant

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36.
Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant_______________?

Pressure

Temperature

Volume

Internal energy

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37.
Total heat of a substance is also known as __________________?

Internal energy

Entropy

Thermal capacity

Enthalpy

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38.
Addition of heat at constant pressure to a gas results in________________?

Raising its temperature

Raising its pressure

Raising its volume

Raising its temperature and doing external work

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39.
Measurement of temperature is based on_________________?

Thermodynamic properties

Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

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40.
Carnot cycle efficiency is maximum when______________?

Initial temperature is 0°K

Final temperature is 0°K

Difference between initial and final temperature is 0°K

Final temperature is 0°C

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41.
If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly_________________?

Temperature

Enthalpy

Internal energy

Entropy

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42.
An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is___________________?

Feasible

Impossible

Possible

Possible, but with lot of sophistications

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43.
In a Carnot cycle, heat is transferred at_______________________?

Constant pressure

Constant volume

Constant temperature

Constant enthaply

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44.
An adiabatic wall is one which__________________?

Prevents thermal interaction

Permits thermal interaction

Encourages thermal interaction

Discourages thermal interaction

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45.
Compressed air coming out from a punctured football___________________?

Becomes hotter

Becomes cooler1

Remains at the same temperature

May become hotter or cooler depend-ing upon the humidity of the surround¬ing air

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