Engineering Thermodynamics Multiple Choice Questions

Engineering Thermodynamics

Question 1.

Addition of heat at constant pressure to a gas results in

A.

 Raising its temperature

B.

 Raising its pressure

C.

 Raising its volume

D.

 Raising its temperature and doing external work

Explanation :

Addition of heat at constant pressure to a gas results in Raising its temperature and doing external work
When you heat a gas, both its vapor pressure and the volume it occupies increase. The individual gas particles become more energetic and the temperature of the gas increases.

Question 2.

Which of the following items is not a path function?

A.

 Heat

B.

 Work

C.

 Kinetic energy

D.

 Thermal conductivity

Explanation :

Heat and work are path functions because they depend on how a sysem changes from initial to final state, hence they are state functions.
Thermal conductivity is mainly a function of the motion of the free electrons therefore property of a material, not a path function.

Question 3.

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

A.

 Feasible

B.

 Impossible

C.

 Possible

D.

 Possible, but with lot of sophistications

Explanation :

Explanation Not Provided

Question 4.

The absolute zero pressure can be attained at a temperature of

A.

 0°C

B.

 -273°C

C.

 273 K

D.

 None of these

Explanation :

Correct Option is (B)
The lower the temperature, the lower the pressure inside of the sphere.
If the exact values were plotted out, a linear relationship would be apparent.
Extrapolating this line to the point where there would be no pressure yields absolute zero, which is about -273.15 degrees Celsius.

Question 5.

Molecular volume of any perfect gas at 600 × 103 N/m² and 27°C will be

A.

 4.17 m3/kg mol

B.

 400 m3/kg mol

C.

 0.15 m3/kg mol

D.

 41.7 m3/kg mol

Explanation :

Explanation Not Provided