Engineering Sciences
GATE XE format:mcq PYQs
Build your understanding with focused practice from past exam papers.
Questions 901–910 of 959. Imported answers require independent review unless marked reviewed.
Question 82
Open questionXE-EMCQ1 markNeeds review
A thermal cycle receives 200 kJ of heat from a heat source at 1000 K. It rejects 300 kJ of heat to a heat sink at 300 K and also rejects 250 kJ of heat to another heat sink at 200 K during the cycle. The cycle is
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 83
Open questionXE-EMCQ1 markNeeds review
Saturated liquid water is slowly heated at a constant pressure of 200 kPa to a final state where its quality reaches 0.65. For water at 200 kPa:
°C,
kJ/kg,
kJ/kg. The change in the specific entropy in kJ/kg.K isYour answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 84
Open questionXE-EMCQ1 markNeeds review
Given the thermodynamic function relations:
and
, the term
is equal toYour answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 85
Open questionXE-EMCQ1 markNeeds review
Two closed cycle gas turbine engines, A and B, operate on air standard Brayton cycle with efficiencies of
and
, respectively. If they operate between the same maximum and minimum temperatures, but with different pressure ratios of
and
, (
), then,Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 88
Open questionXE-EMCQ2 marksNeeds review
In a polytropic compression process, one kg of an ideal gas having a molecular weight of 40 kg/kmol is compressed from 100 kPa, 300 K to 400 kPa, 360 K. The magnitude of the work in kJ for the process is
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 93
Open questionXE-EMCQ2 marksNeeds review
A pure substance (
= 0.733 kJ/kg.K) undergoes a reversible process in which its temperature increases linearly from 40°C to 85°C and its specific entropy increases by 600 J/kg.K. The work done by the system in kJ/kg isYour answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 94
Open questionXE-EMCQ2 marksNeeds review
An ideal gas having a mass of 0.5 kg is initially at 300 kPa, 80°C and occupies a volume of 0.14 m³. The gas undergoes an adiabatic process, where 50 kJ of work is transferred to the gas. The pressure and volume at the final state are 300 kPa and 0.20 m³. The change in the entropy of the gas in J/K is
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 95
Open questionXE-EMCQ2 marksNeeds review
The van der Waals equation of state is given as,
where p in bar, v in m³/kmol and T is in K.
For air, the constants, a and b, are 1.368 bar.(m³/kmol)² and 0.0367 m³/kmol, respectively. Air is contained in a system at 160 K and 0.08 m³/kmol. If p₁ is the pressure calculated using ideal gas equation of state and p₂ is pressure calculated using van der Waals equation of state, then p₁/p₂ is equal to
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 100
Open questionXE-FMCQ1 markNeeds review
Poly(ethylene terephthalate) is synthesized from
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 101
Open questionXE-FMCQ1 markNeeds review
Poly(vinyl chloride) has a higher T_g than polypropylene due to the presence of
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer