# Mechanical Engineering Thermodynamics – Set 03

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## Q1. In open cycle gas turbine plants

(A) Direct combustion systems is used
(B) A condenser is used
(C) The indirect heat exchanger and cooler is avoided
(D) All of the above

Answer: (D) All of the above

(A) Nitrogen
(B) Hydrogen
(C) Methane
(D) Oxygen

## Q3. The processes occurring in open system which permit the transfer of mass to and from the system, are known as

(A) Flow processes
(B) Non-flow processes
(D) None of these

## Q4. Thermal power plant works on

(A) Carnot cycle
(B) Joule cycle
(C) Rankine cycle
(D) Otto cycle

## Q5. Reversed joule cycle is called

(A) Carnot cycle
(B) Rankine cycle
(C) Brayton cycle
(D) Bell Coleman cycle

## Q6. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

(A) Cracking
(B) Fractional distillation
(C) Full distillation
(D) Carbonisation

## Q7. For a perfect gas, according to Boyle’s law (where P = Absolute pressure, V = Volume and T = Absolute temperature)

(A) V/T = constant, if p is kept constant
(B) P v = constant, if T is kept constant
(C) T/P = constant, if v is kept constant
(D) P/T = constant, if v is kept constant

Answer: (B) P v = constant, if T is kept constant

(A) Newton
(B) Pascal
(C) Erg
(D) Watt

## Q9. According to Avogadro’s Hypothesis

(A) The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
(B) The sum of partial pressure of mixture of two gases is sum of the two
(C) Product of the gas constant and the molecular weight of an ideal gas is constant
(D) Gases have two values of specific heat

Answer: (A) The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature

## Q10. Which of the following items is not a path function?

(A) Heat
(B) Work
(C) Kinetic energy
(D) Thermal conductivity

(A) 80°C
(B) 0°C
(C) 40°C
(D) 20°C

## Q12. The behavior of a perfect gas, undergoing any change in the variables which control physical properties, is governed by

(A) Boyle’s law
(B) Gay-Lussac law
(C) Charles’ law
(D) All of these

## Q13. When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

(A) Zeroth law of thermodynamics
(B) First law of thermodynamics
(C) Second law of thermodynamics
(D) Kelvin Planck’s law

Answer: (A) Zeroth law of thermodynamics

(A) 3/7
(B) 11/7
(C) 11/3
(D) 4/11

## Q15. Calorie is a measure of

(A) Specific heat
(B) Quantity of heat
(C) Thermal capacity
(D) Entropy

(A) 1 kN-m
(B) 1 N-m
(C) 10 kN-m/s
(D) 10 N-m/s

## Q17. According to Avogadro’s law, for a given pressure and temperature, each molecule of a gas

(A) Occupies same volume
(B) Occupies volume proportional to its specific weight
(C) Occupies volume inversely proportional to its molecular weight
(D) Occupies volume inversely proportional to its specific weight

## Q18. Entropy change depends on

(A) Heat transfer
(B) Mass transfer
(C) Change of temperature
(D) Thermodynamic state

(A) 14
(B) 16
(C) 18
(D) 121