Lakshya Education MCQs

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  3. Engineering Thermodynamics Mcqs
Question: The heat and work are mutually convertible. this statement is called __________ law of thermodynamics.
Options:
A. Zeroth
B. First
C. Second
D. Third
Answer: Option B

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Question 1. According to kelvin-planck's statement of second law of thermodynamics,
  1.     It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
  2.     It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
  3.     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
  4.     None of the above
Answer: Option A
Question 2. Which of the following statement is correct according to clausis statement of second law of thermodynamics?
  1.     It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
  2.     It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
  3.     It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
  4.     None of the above
Answer: Option B
Question 3. Which of the following is the correct statement of the second law of thermodynamics?
  1.     There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
  2.     It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
  3.     It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
  4.     All of the above
Answer: Option D
Question 4. Which of the following statement is correct according to clausis statement of second law of thermodynamics?
  1.     It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
  2.     It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
  3.     It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
  4.     None of the above
Answer: Option B
Question 5. Work-done during adiabatic expansion is given by (where p1 v1, t1 = pressure, volume and temperature for the initial condition of gas, p2, v2, t2 = corresponding values for the final condition of gas, r = gas constant, and γ = ratio of specific heats)
  1.     (p1 v1 - p2, v2)/(γ - 1)
  2.     [m R (T1 - T2)] /(γ - 1)
  3.     [m R T1/(γ - 1)][1 - (p2, v2 /p1 v1)]
  4.     All of these
Answer: Option D
Question 6. According to first law of thermodynamics,
  1.     Total internal energy of a system during a process remains constant
  2.     Total energy of a system remains constant
  3.     Work-done by a system is equal to the heat transferred by the system
  4.     Internal energy, enthalpy and entropy during a process remain constant
Answer: Option B

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