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Engineering Thermodynamics MCQ Questions & Answers | Mechanical Engineering

Learn Engineering Thermodynamics MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Engineering Thermodynamics MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-5 section-2

Each section contains 100 MCQs on Engineering Thermodynamics .
41
A cycle consisting of two constant pressure and two isentropic processes is known as
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Answer & Solution
Answer: Option D
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42
A cycle consisting of two adiabatic and two constant pressure processes is known as
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Answer & Solution
Answer: Option C
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43
A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
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Answer & Solution
Answer: Option D
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44
A process, in which the temperature of the working substance remains constant during its expansion or compression, is called
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Answer & Solution
Answer: Option B
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45
The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
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Answer & Solution
Answer: Option A
Solution:
In a Brayton cycle without regeneration, the ideal efficiency increases with an increase in pressure ratio.

The efficiency of a Brayton cycle without regeneration is given by:
η = 1 - (1/rk-1)
where η is the cycle efficiency, r is the pressure ratio (pmax/pmin), and k is the specific heat ratio.

As the pressure ratio increases, the denominator term (1/rk-1) decreases, resulting in a higher efficiency.

Therefore, the correct option is Increase.
46
The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will
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Answer & Solution
Answer: Option B
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47
Absolute zero pressure will occur
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Answer: Option B
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48
In a free expansion process
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Answer & Solution
Answer: Option C
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49
The ratio of two specific heats of air is equal to
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Answer: Option D
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50
One kg of carbon produces ________ kg of carbon dioxide.
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Answer: Option C
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