Mechanical Engineering Thermodynamics Problems - Set 13

Practice Test: Question Set - 13

1. The more effective way of increasing efficiency of Carnot engine is to
    (A) Increase higher temperature
    (B) Decrease higher temperature
    (C) Increase lower temperature
    (D) Decrease lower temperature

2. Which of the following has the minimum atomic mass?
    (A) Sulphur
    (B) Nitrogen
    (C) Oxygen
    (D) Carbon

3. 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
    (C) Adiabatic processes
    (D) None of these

4. Entropy change depends on
    (A) Heat transfer
    (B) Mass transfer
    (C) Change of temperature
    (D) Thermodynamic state

5. For reversible adiabatic process, change in entropy is
    (A) Maximum
    (B) Minimum
    (C) Zero
    (D) Negative

6. Carnot cycle has maximum efficiency for
    (A) Reversible engine
    (B) Irreversible engine
    (C) Petrol engine
    (D) Diesel engine

7. 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

8. 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

9. Measurement of temperature is based on
    (A) Thermodynamic properties
    (B) Zeroth law of thermodynamics
    (C) First law of thermodynamics
    (D) Second law of thermodynamics

10. Carnot cycle efficiency depends upon
    (A) Properties of the medium/substance used
    (B) Condition of engine
    (C) Working condition
    (D) Temperature range of operation

11. Compressed air coming out from a punctured football
    (A) Becomes hotter
    (B) Becomes cooler
    (C) Remains at the same temperature
    (D) May become hotter or cooler depending upon the humidity of the surrounding air

12. Water contained in a beaker can be made to boil by passing steam through it
    (A) At atmospheric pressure
    (B) At a pressure greater than atmospheric pressure
    (C) Any pressure
    (D) Not possible

13. During throttling process
    (A) Heat exchange does not take place
    (B) No work is done by expanding steam
    (C) There is no change of internal energy of steam
    (D) All of the above

14. The energy of molecular motion appears as
    (A) Heat
    (B) Potential energy
    (C) Surface tension
    (D) Friction

15. The compression ratio for Diesel engines is
    (A) 15 to 20
    (B) 5 to 8
    (C) 3 to 6
    (D) 20 to 30

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Engineering Thermodynamics:
  Set 01      Set 02      Set 03      Set 04      Set 05      Set 06      Set 07      Set 08      Set 09
  Set 10      Set 11      Set 12      Set 13      Set 14      Set 15      Set 16      Set 17      Set 18
  Set 19      Set 20      Set 21      Set 22      Set 23      Set 24      Set 25      Set 26      Set 27
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