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This set of Engineering Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on Engineering Thermodynamics Set 10
Q1 | ……… is the ratio of actual cycle efficiency to that of the ideal cycle efficiency
- a) efficiency ratio
- b) work ratio
- c) effectiveness
- d) none of the above
Q2 | The gas laws can be usedwith minimum error is case of
- a) wet steam
- b) dry steam
- c) saturated steam
- d) superheated steam
Q3 | Mathematically a puresubstance can be written as
- a) p=f(t,v)
- b) v= f(p,t)
- c) t=f(p,v)
- d) any of the above
Q4 | A Carnot cycle operates between source & sink temperatures of 250°C & - 15°C. If the system receives 90kJ from the source then the net worktransfer equals
- a) 30.5 kj
- b) 35.65 kj
- c) 45.54 kj
- d) 65.54 kj
Q5 | Consider the following statements regarding superheating in Rankine Cycles1. It reduces the specific steam consumption2. It increases the dryness fraction of steam at the exhaust for the same value of condenser pressure3. It reduces the cycle efficiency Of the these statements
- 1 & 2 are correct
- 2 & 3 are correct
- 1 & 3 are correct
- 1, 2 & 3 are correct
Q6 | Energy is a
- point function
- property of the system
- extensive property
- all of the mentioned
Q7 | The specific energy, e=E/m is an extensive property.
- true
- false
Q8 | (m*V*V)/2 gives the
- macroscopic kinetic energy
- microscopic kinetic energy
- macroscopic potential energy
- microscopic potential energy
Q9 | (m*g*z) gives the
- macroscopic kinetic energy
- microscopic kinetic energy
- macroscopic potential energy
- microscopic potential energy
Q10 | Which of the following types of energy can be present in molecules?
- translational and rotational kinetic energy
- electronic energy and vibrational energy
- chemical energy and nuclear energy
- all of the mentioned
Q11 | The total internal energy of the system is given by
- u=n/ɛ
- u=nɛ
- u=ɛ/n
- none of the mentioned
Q12 | In an ideal gas there are no intermolecular forces of attraction and repulsion, and the internal energy is a function of temperature only.
- true
- false
Q13 | Which of the following is true in regard to the energy of an isolated system?
- dq≠0
- dw≠0
- e=constant
- all of the mentioned
Q14 | A perpetual motion machine of first kind
- is a fictitious machine
- can supply mechanical work without dissipating energy
- violates first law
- all of the mentioned
Q15 | The limitation of the first law is
- does not indicate the possibility of a spontaneous process proceeding in a definite direction
- it assigns a quality to different forms of energy
- indicates the direction of any spontaneous process
- none of the mentioned
Q16 | Integral of dQ/T is independent of reversible path connecting between two points.
- true
- false
Q17 | Integral of dQ/T of a reversible path is given by
- si-sf
- sf-si
- si+sf
- -si-sf
Q18 | Entropy is a
- path function, intensive property
- path function, extensive property
- point function, intensive property
- point function, extensive property
Q19 | Specific entropy is given by( where m is the mass)
- sm
- m/s
- s/m
- none of the mentioned
Q20 | For any process which is undergone by a system
- dq/t>=ds
- dq/t<=ds
- dq/t≠ds
- none of the mentioned
Q21 | For an irreversible process,
- ds=dq/t
- ds>dq/t
- ds
- none of the mentioned
Q22 | For two different paths between same two points, entropy change is
- depends on path taken
- different
- same
- none of the mentioned
Q23 | For the general case, we can write
- s2-s1<=dq/t for a path
- s2-s1>=dq/t for a path
- s2-s1≠dq/t for a path
- none of the mentioned
Q24 | A reversible process is performed in such a way that
- at the conclusion of process, both system and surroundings can be restored to their initial states without producing any change
- it should not leave any trace to show that the process had ever occurred
- it is carried out infinitely slowly
- all of the mentioned
Q25 | A reversible process coincides with a quasi-static process.
- true
- false