Lakshya Education MCQs

Question: The change of entropy, when heat is absorbed by the gas, is
Options:
A. Positive
B. Negative
C. Positive or negative
D. None of these
Answer: Option A

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Question 1. For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order
  1.     Dual cycle, Diesel cycle, Otto cycle
  2.     Otto cycle, Diesel cycle, Dual cycle
  3.     Dual cycle, Otto cycle, Diesel cycle
  4.     Diesel cycle, Otto cycle, Dual cycle
Answer: Option A
Question 2. The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.
  1.     Boyle's law
  2.     Charle's law
  3.     Gay-Lussac law
  4.     Joule's law
Answer: Option D
Question 3. Select the wrong statement
  1.     A Joule cycle consists of two constant volume and two isentropic processes.
  2.     An Otto cycle consists of two constant volume and two isentropic processes.
  3.     An Ericsson cycle consists of two constant pressure and two isothermal processes.
  4.     All of the above
Answer: Option A
Question 4. When gas is heated at constant pressure, the heat supplied is utilized in
  1.     Increasing the internal energy of gas
  2.     Doing some external work
  3.     Increasing the internal energy of gas and also for doing some external work
  4.     None of the above
Answer: Option C
Question 5. When gas is heated at constant pressure, the heat supplied is utilized in
  1.     Increasing the internal energy of gas
  2.     Doing some external work
  3.     Increasing the internal energy of gas and also for doing some external work
  4.     None of the above
Answer: Option C
Question 6. For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order
  1.     Dual cycle, Diesel cycle, Otto cycle
  2.     Otto cycle, Diesel cycle, Dual cycle
  3.     Dual cycle, Otto cycle, Diesel cycle
  4.     Diesel cycle, Otto cycle, Dual cycle
Answer: Option A

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