Engineering Sciences
2018 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE XE 2018 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 97–99 of 175. Imported answers require review unless explicitly marked reviewed.
Question 10
Open questionXE-EMCQ2 marksNeeds review
Consider the following statements for an ideal gas undergoing a reversible non-flow process:
P. If the process is adiabatic, the change in enthalpy of the gas is necessarily zero.
Q. If the process is adiabatic, the change in entropy of the gas is necessarily zero.
R. If the process is isothermal, the change in enthalpy of the gas is necessarily zero.
S. If the process is isothermal, the change in entropy of the gas is necessarily zero.
Which one of the following options is valid?
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Open questionXE-EMCQ2 marksNeeds review
An ideal Otto cycle (O) and an ideal diesel cycle (D) have the same maximum temperature and reject equal amount of heat. Also, the working fluid enters at the same state before compression. One of the following statements always true about their efficiencies (
) isYour answerChoose one option.
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Open questionXE-EMCQ2 marksNeeds review
A reversible engine receives 75 kJ/s of energy from a reservoir at 750 K and does 12 kJ/s of work. The heat is rejected to two reservoirs at 650 K and 550 K. The rate of heat rejection (in kJ/s) to the reservoir at 650 K is
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