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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-1

Each section contains 100 MCQs on Engineering Thermodynamics .
41
The fuel mostly used in steam boilers is
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
42
Water contained in a beaker can be made to boil by passing steam through it
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Answer & Solution
Answer: Option B
Solution:
The boiling point of a liquid is the temperature at which its vapor pressure is equal to the atmospheric pressure. When steam is passed through water, it heats the water, and if the pressure of the steam is greater than the atmospheric pressure, it can make the water boil even at a temperature below 100°C (the boiling point of water at atmospheric pressure).

This phenomenon is utilized in various industrial processes, such as in steam generators and pressure cookers. When steam is supplied at a pressure higher than atmospheric pressure, the water in the beaker can be made to boil even at a temperature higher than 100°C.

Among the options provided, the correct answer is Option B: At a pressure greater than atmospheric pressure. This is because boiling at a pressure higher than atmospheric pressure allows the water to reach its boiling point at a temperature higher than 100°C.

Therefore, the correct answer is Option B: At a pressure greater than atmospheric pressure.
43
For which of the following substances, the internal energy and enthalpy are the functions of temperature only
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Answer & Solution
Answer: Option D
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44
The mass of flue gas per kg of fuel is the ratio of the
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Answer & Solution
Answer: Option C
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45
An open cycle gas turbine works on
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Answer & Solution
Answer: Option C
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46
One watt is equal to
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Answer & Solution
Answer: Option A
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47
If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to
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Answer & Solution
Answer: Option C
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48
The specific heat of air increases with increase in
Discuss
Answer & Solution
Answer: Option A
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49
The sum of internal energy (U) and the product of pressure and volume (PV) is known as
Discuss
Answer & Solution
Answer: Option D
Solution:
H = U + PV
Where, H = Enthalpy,
U = Internal energy,
PV = Product of pressure & volume.
50
The gas constant (R) is equal to the
Discuss
Answer & Solution
Answer: Option B
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