Heat flow into a system is ____, and heat flow out of the system is ________
a) positive, positive
b) negative, negative
c) negative, positive
d) positive, negative
Q.2.
Joule was the first to prove that heat is a type of energy, laying the groundwork for the fundamental law of thermodynamics.
a) False
b) True
Q.3.
What does (m*g*z) give?
a) macroscopic kinetic energy
b) microscopic kinetic energy
c) macroscopic potential energy
d) microscopic potential energy
Q.4.
The enthalpy and internal energy are the function of temperature for
a) all gases
b) steam
c) water
d) ideal gas
Q.5.
In which of the following systems does mass transfer occur across the system boundary?
a) isolated system
b) closed system
c) open system
d) none of the mentioned
Q.6.
When more than one fluid stream enters or leaves the control volume, which of the following type of balance is taken?
a) mass balance
b) energy balance
c) mass balance and energy balance
d) none of the mentioned
Q.7.
Fluid flow through which of the following throttles the flow?
a) partially opened valve
b) orifice
c) porous plug
d) all of the mentioned
Q.8.
Rate of energy increase within the control volume is given by
a) rate of energy inflow * rate of energy outflow
b) rate of energy inflow – rate of energy outflow
c) rate of energy inflow / rate of energy outflow
d) rate of energy inflow + rate of energy outflow
Q.9.
Which of the following is true for a discharging tank?
a) the process is quasi-static
b) the process is adiabatic
c) dQ=0
d) all of the mentioned
Q.10.
A cylinder/piston contains 1kg methane gas atkPa, 20°C. The gas is compressed reversibly to a pressure ofkPa. WHat is the work required if the process is isothermal?
a) -116.0 kJ
b) -316.0 kJ
c) -216.0 kJ
d) -416.0 kJ
Q.11.
Which of the following statements are true for a mechanical energy reservoir(MER)?
a) all processes within an MER are quasi-static
b) it is a large body enclosed by an adiabatic impermeable wall
c) stores work as KE or PE
d) all of the mentioned
Q.12.
Which of the following is true according to Clausius statement?
a) it is possible to construct a device that can transfer heat from a cooler body to a hotter body without any effect
b) it is impossible to construct a device that can transfer heat from a cooler body to a hotter body without any effect
c) it is impossible to construct a device that can transfer heat from a hotter body to a cooler body without any effect
d) none of the mentioned
Q.13.
What is the relationship between Kelvin-Planck’s and Clausius’ statements?
a) violation of one doesn’t violate the other
b) not connected to each other
c) virtually two parallel statements of the second law
d) none of the mentioned
Q.14.
Which of the following causes irreversibility?
a) electrical resistance, magnetic hysteresis
b) friction, viscosity
c) inelasticity
d) all of the mentioned
Q.15.
The reversed heat engine takes heat from a ___ temperature body, then discharges it to a ___ temperature body and ___ an inward flow of the network.
a) high, low, gives
b) low, high, gives
c) high, low, receives
d) low, high, receives
Q.16.
If a system undergoes a reversible isothermal process without transfer of heat, the temperature at which this process takes place is called
a) triple point of water
b) boiling point of water
c) absolute zero
d) none of the mentioned
Q.17.
Which of the following is known as the inequality of Clausius?
a) cyclic integral of dW/T<=0
b) cyclic integral of dW/T>=0
c) cyclic integral of dQ/T>=0
d) cyclic integral of dQ/T<=0
Q.18.
Which of the following properties describe entropy?
a) point function, intensive property
b) point function, extensive property
c) path function, extensive property
d) path function, intensive property
Q.19.
Which of the following statement is true?
a) for reversible adiabatic process, S=constant
b) for reversible isothermal heat transfer, Q=t(Sf-Si)
c) both of the mentioned
d) none of the mentioned
Q.20.
The entropy of an isolated system can never ____
a) decrease
b) be zero
c) increase
d) none of the mentioned
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