Engineering Thermodynamics Questions And Answers - Set 16 - ObjectiveBooks

# Practice Test: Question Set - 16

1. A cycle consisting of __________ and two isothermal processes is known as Stirling cycle.
(A) Two constant pressure
(B) Two constant volume
(C) Two isentropic
(D) One constant pressure, one constant volume

2. The condition for the reversibility of a cycle is
(A) The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
(B) All the processes, taking place in the cycle of operation, must be extremely slow
(C) The working parts of the engine must be friction free
(D) All of the above

3. The change of entropy, when heat is absorbed by the gas, is
(A) Positive
(B) Negative
(C) Positive or negative
(D) None of these

4. The throttling process is __________ process.
(A) Reversible
(B) Irreversible
(C) Reversible or irreversible
(D) None of these

5. The isothermal and adiabatic processes are regarded as
(A) Reversible process
(B) Irreversible process
(C) Reversible or irreversible process
(D) None of these

6. For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order
(A) Dual cycle, Diesel cycle, Otto cycle
(B) Otto cycle, Diesel cycle, Dual cycle
(C) Dual cycle, Otto cycle, Diesel cycle
(D) Diesel cycle, Otto cycle, Dual cycle

7. The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant)
(A) pv = mRT
(B) pv = RTm
(C) pvm = C
(D) pv = (RT)m

8. For the same maximum pressure and temperature,
(A) Otto cycle is more efficient than Diesel cycle
(B) Diesel cycle is more efficient than Otto cycle
(C) Dual cycle is more efficient than Otto and Diesel cycles
(D) Dual cycle is less efficient than Otto and Diesel cycles

9. Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.
(A) 1/27th
(B) 1/93th
(C) 1/173th
(D) 1/273th

10. A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
(A) 30 kJ
(B) 54 kJ
(C) 84 kJ
(D) 114 kJ

11. The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as
(A) Law of equipartition of energy
(B) Law of conservation of energy
(C) Law of degradation of energy
(D) None of these

12. An isothermal process is governed by
(A) Boyle's law
(B) Charles' law
(C) Gay-Lussac law

13. A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
(A) Carnot cycle
(B) Stirling cycle
(C) Otto cycle
(D) Diesel cycle

14. Which of the following statement is incorrect?
(A) The liquid fuels consist of hydrocarbons
(B) The liquid fuels have higher calorific value than solid fuels
(C) The solid fuels have higher calorific value than liquid fuels
(D) A good fuel should have low ignition point

15. The efficiency of Joule cycle is
(A) Greater than Carnot cycle
(B) Less than Carnot cycle
(C) Equal to Carnot cycle
(D) None of these

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