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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

Heat and work are ____________________?
A point functions
B system properties
C path functions
D intensive properties
Correct Answer: path functions
On weight basis, air contains following parts of oxygen_________________?
A 21
B 23
C 25
D 73
Correct Answer: 23
Mixture of ice and water form a________________________?
A closed system
B open system
C isolated system
D heterogeneous system
Correct Answer: heterogeneous system
Which of the following quantities is not the property of the system__________________?
A pressure
B temperature
C specific volume
D heat
Correct Answer: heat
An isolated system is one in which_____________________?
A mass does not cross boundaries of the system, though energy may do so
B neither mass nor energy crosses the boundaries of the system
C both energy and mass cross the boundaries of the system
D mass crosses the boundary but not the energy
Correct Answer: neither mass nor energy crosses the boundaries of the system
To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is____________________?
A divided by its molecular weight
B multiplied by its molecular weight
C multiplied by its density
D multiplied by its specific weight
Correct Answer: multiplied by its molecular weight
Work done in a free expansion process is___________________?
A + ve
B -ve
C zero
D maximum
Correct Answer: zero
According to Avogadro’s Hypothesis ______________________?
A the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
B the sum of partial pressure of mixture of two gases is sum of the two
C product of the gas constant and the molecular weight of an ideal gas is constant
D gases have two values of specific heat
Correct Answer: the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
The same volume of all gases would represent their____________________?
A densities
B specific weights
C molecular weights
D gas characteristic constants
Correct Answer: molecular weights
Boyle’s law i.e. pV = constant is applicable to gases under ___________________?
A all ranges of pressures
B only small range of pressures
C high range of pressures
D steady change of pressures
Correct Answer: only small range of pressures
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