111. The efficiency of the Carnot cycle may be increased by
increasing the highest temperature
decreasing the highest temperature
increasing the lowest temperature
keeping the lowest tem
✅ The correct answer is option A.
Thermodynamics MCQs
112. In a reversible adiabatic process, the ratio of T1/T2 is equal to
✅ The correct answer is option B.
113. The efficiency of a dual combustion cycle __________ upon cut-off ratio.
depends
does not depend
✅ The correct answer is option A.
114. The efficiency of Diesel cycle increases with increase in cut-off.
Yes
No
✅ The correct answer is option B.
115. The gas turbine cycle with regenerator improves
thermal efficiency
work ratio
avoids pollution
none of these
✅ The correct answer is option A.
116. The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.
Boyle’s law
Charle’s law
Gay-Lussac law
Joule’s law
✅ The correct answer is option D.
117. The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of ‘g’ is 9.81 m/s2. The absolute pressure in the vessel is
23.97 bar
25 bar
26.03 bar
34.81 bar
✅ The correct answer is option C.
118. The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)
δQ = T.ds
δQ = T/ds
dQ = ds/T
none of these
✅ The correct answer is option A.
119. The absolute zero pressure can be attained at a temperature of
0°C
273°C
273 K
none of these
✅ The correct answer is option D.
120. If the carbon content in the bituminous coal is 78 to 81%, it is said to be coking bituminous coal.
Agree
Disagree
✅ The correct answer is option B.