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Q1. The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when
(A) Flow is uniform and steady
(B) Process is isentropic
(C) Process is isothermal
(D) Process is isentropic and specific heat does not change with temperature
Answer: (D) Process is isentropic and specific heat does not change with temperature
Q2. The efficiency of Diesel cycle increases with
(A) Increase in cut-off
(B) Constant cut-off
(C) Decrease in cut-off
(D) None of these
Answer: (C) Decrease in cut-off
Q3. Otto cycle consists of following four processes
(A) Two isothermal and two isentropic
(B) Two isentropic and two constant volumes
(C) Two isentropic, one constant volume and one constant pressure
(D) Two isentropic and two constant pressures
Answer: (B) Two isentropic and two constant volumes
Q4. Which of the following cycles is not a reversible cycle?
(A) Carnot
(B) Ericsson
(C) Stirling
(D) None of the above
Answer: (D) None of the above
Q5. A cycle consisting of _ and two isothermal processes is known as Stirling cycle.
(A) Two isentropic
(B) One constant pressure, one constant volume
(C) Two constant volumes
(D) Two constant pressures
Answer:(C) Two constant volumes
Q6. A closed system is one in which
(A) Mass does not cross boundaries of the system, though energy may do so
(B) Mass crosses the boundary but not the energy
(C) Neither mass nor energy crosses the boundaries of the system
(D) Both energy and mass cross the boundaries of the system
Answer: (A) Mass does not cross boundaries of the system, though energy may do so
Q7. Intensive property of a system is one whose value
(A) Depends on the mass of the system, like volume
(B) Does not depend on the mass of the system, like temperature, pressure, etc.
(C) Is not dependent on the path followed but on the state
(D) Is dependent on the path followed and not on the state
Answer: (B) Does not depend on the mass of the system, like temperature, pressure, etc.
Q8. Work done in a free expansion process is
(A) +ve
(B) -ve
(C) Zero
(D) Maximum
Answer: (C) Zero
Q9. According to Kelvin-Planck’s statement of second law of thermodynamics,
(A) It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
(B) It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
(C) It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
(D) None of the above
Answer: Option C
Q10. One watt is equal to
(A) 1 Nm/s
(B) 1 N/m
(C) 1 Nm/hr
(D) 1 kNm/hr
Answer: (A) 1 Nm/s
Q11. Which of the following processes is irreversible process?
(A) Isothermal
(B) Adiabatic
(C) Throttling
(D) All of the above
Answer: (C) Throttling
Q12. The specific heat at constant volume is
(A) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
(B) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
(C) The amount of heat required to raise the temperature of 1 kg of water through one degree
(D) Any one of the above
Answer: (A) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
Q13. Which of the following is the correct statement of the second law of thermodynamics?
(A) There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
(B) It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
(C) It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
(D) All of the above
Answer: (D) All of the above
Q14. Barometric pressure is equal to
(A) 760 mm Hg
(B) Zero mm Hg
(C) 735.6 mm Hg
(D) 1 mm Hg
Answer: (A) 760 mm Hg
Q15. Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to
(A) T
(B) J
(C) J²
(D) Vr
Answer: (A) T
Q16. Change in enthalpy of a system is the heat supplied at
(A) Constant pressure
(B) Constant temperature
(C) Constant volume
(D) Constant entropy
Answer: (A) Constant pressure
Q17. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
(A) Kilo Joule
(B) Specific heat at constant volume
(C) Specific heat at constant pressure
(D) None of these
Answer: (B) Specific heat at constant volume
Q18. The efficiency of a Carnot engine depends on
(A) Working substance
(B) Design of engine
(C) Size of engine
(D) Temperatures of source and sink
Answer: (D) Temperatures of source and sink
Q19. The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as
(A) Dual combustion cycle
(B) Diesel cycle
(C) Atkinson cycle
(D) Rankine cycle
Answer: (C) Atkinson cycle
Q20. A tri-atomic molecule consists of __ atoms.
(A) Three
(B) One
(C) Two
(D) Four
Answer: (A) Three
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- Mechanical Engineering Thermodynamics – Set 3
- Mechanical Engineering Thermodynamics – Set 4
- Mechanical Engineering Thermodynamics – Set 5
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- Mechanical Engineering Thermodynamics – Set 7
- Mechanical Engineering Thermodynamics – Set 8
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- Mechanical Engineering Thermodynamics – Set 19
- Mechanical Engineering Thermodynamics – Set 20
- Mechanical Engineering Thermodynamics – Set 21
- Mechanical Engineering Thermodynamics – Set 22