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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

Zeroth law of thermodynamics________________?
A deals with conversion of mass and energy
B deals with reversibility and irreversibility of process
C states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
D deals with heat engines
Correct Answer: states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
Change in enthalpy of a system is the heat supplied at___________________?
A constant pressure
B constant temperature
C constant volume
D constant entropy
Correct Answer: constant pressure
If value of n is infinitely large in a polytropic process pV” = C, then the process is known as constant_____________________?
A volume
B pressure
C temperature
D enthalpy
Correct Answer: volume
A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is________________?
A 54°C
B 327°C
C 108°C
D 654°C
Correct Answer: 327°C
The value of n = 1 in the poly tropic process indicates it to be __________________?
A reversible process
B isothermal process
C adiabatic process
D irreversible process
Correct Answer: isothermal process
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
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