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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-2 section-2

Each section contains 100 MCQs on Engineering Thermodynamics .
11
One Joule (J) is equal to
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
12
Reversed joule cycle is called
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Answer & Solution
Answer: Option D
Solution:
Apparently, the Brayton cycle and the Joule cycle are almost the same. The reversed Joule cycle is actually known as Bell-coleman cycle. Its purpose is to move heat, rather than produce work.
13
The entropy __________ in an irreversible cyclic process.
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Answer & Solution
Answer: Option C
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14
The pressure of a gas in terms of its mean kinetic energy per unit volume 'E' is equal to
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Answer & Solution
Answer: Option D
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15
The efficiency of Diesel cycle approaches to Otto cycle efficiency when
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Answer & Solution
Answer: Option D
Solution:
In the Diesel cycle, the efficiency approaches the efficiency of the Otto cycle when the cut-off is zero.

The Diesel cycle consists of constant pressure heat addition followed by constant volume heat rejection. When the cut-off ratio is zero, the heat addition process in the Diesel cycle becomes constant volume (isochoric) instead of constant pressure. This is analogous to the heat addition process in the Otto cycle, where heat is added at constant volume.

As a result, when the cut-off ratio is zero in the Diesel cycle, its thermal efficiency approaches that of the Otto cycle, which is higher due to the constant volume heat addition process. Therefore, the correct option is Option D: Cut-off is zero.
16
The heat energy stored in the gas and used for raising the temperature of the gas is known as
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Answer & Solution
Answer: Option B
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17
According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.
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Answer & Solution
Answer: Option B
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18
In an isothermal process, the internal energy
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Answer & Solution
Answer: Option C
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19
Calorie is a measure of
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Answer & Solution
Answer: Option B
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20
Kerosene is distilled at
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Answer & Solution
Answer: Option B
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