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Mechanical Engineering Objective Questions { Thermodynamics }



155. The processes occuring in open system which permit the transfer of mass to and from the system, are known as
A.Flow processes
B.Non-flow processes
C.Adiabatic processes
D.None of these
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156. Which of the following has the minimum atomic mass?
A.Oxygen
B.Sulphur
C.Nitrogen
D.Carbon
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157. Workdone in a free expansion process is
A.Zero
B.Minimum
C.Maximum
D.Positive
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158. The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.
A.One-half
B.One-third
C.Two-third
D.Three-fourth
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159. The compression ratio for petrol engines is
A.3 to 6
B.5 to 8
C.15 to 20
D.20 to 30
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160. The efficiency of Diesel cycle approaches to Otto cycle efficiency when
A.Cut-off is increased
B.Cut-off is decreased
C.Cut-off is zero
D.Cut-off is constant
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161. The atomic mass of oxygen is
A.12
B.14
C.16
D.32
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