Entropy of mixing is always
A.Zero
B.positive
C.Negative
Category: Thermodynamics Mcqs
The number of processes in a Rankine cycle is
A.Two
B.Three
C.Four
D.Five
E.Six
Which of the following is the best fuel for diesel engines?
A.Olefins
B.Paraffins
C.Naphthenes
D.Aromatics
The velocity potential exists
A.For all types of continuous flow
B.Only for rotational flow
C.Only for irrotational flow
D.Only for laminar flow
E.Only for unidirectional flow
In unsteady state, heat transfer occurs when
A.The body through which heat flow is in motion
B.The source of heat is in motion
C.The heat flow changes with change in temperature
D.The heat flow changes with time
E.None of the above
Which of the following is not a reversible cycle?
A.Carnot cycle
B.Stirling cycle
C.Ericsson cycle
D.Otto cycle
E.All of the above
When a fluid is passed in steady, flow through a porous plug in a duct under such conditions that heat transfer, kinetic energy change and potential change is negligible, the process is called
A.Constant pressure compression
B.Isothermal compression
C.Frictionless compression
D.Throttling
E.Separation
Which of the following does not use ambient air for propulsion?
A.Turbo jet
B.Pulse jet
C.Turbo-prop
D.Rocket
If the two specific heats of a gas are 0.237 and 0.169 respectively, the volume of 3 kg of air at 27?C under a pressure of 3 ata would be
A.0.204 cu-m
B.1 cu-m
C.1.5 cu-m
D.1.74 cu-m
E.2.5 cu-m
