Mechanical Engineering Thermodynamics - Set 04

Practice Test: Question Set - 04

1. The specific heat of water is
    (A) 2.512
    (B) 1.817
    (C) 4.187
    (D) None of these

2. According to which law, all perfect gases change in volume by 1/273th of their original volume at 0°C for every 1°C change in temperature when pressure remains constant
    (A) Joule's law
    (B) Boyle's law
    (C) Gay Lussac’s law
    (D) Charles' law

3. Gases have
    (A) Only one value of specific heat
    (B) Two values of specific heat
    (C) No value of specific heat
    (D) Under some conditions one value and sometimes two values of specific heat

4. According to Avogadro's Hypothesis
    (A) The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
    (B) The sum of partial pressure of mixture of two gases is sum of the two
    (C) Product of the gas constant and the molecular weight of an ideal gas is constant
    (D) Gases have two values of specific heat

5. Stirling and Ericsson cycles are
    (A) Quasi-static cycles
    (B) Reversible cycles
    (C) Semi-reversible cycles
    (D) Irreversible cycles

6. Reheating in a gas turbine
    (A) Increases the compressor work
    (B) Increases the turbine work
    (C) Increases the thermal efficiency
    (D) Decreases the thermal efficiency

7. Extensive 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

8. Work done in a free expansion process is
    (A) +ve
    (B) -ve
    (C) Zero
    (D) Maximum

9. The statement that molecular weights of all gases occupy the same volume is known as
    (A) Avogadro's hypothesis
    (B) Dalton's law
    (C) Gas law
    (D) Law of thermodynamics

10. To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is
    (A) Divided by its molecular weight
    (B) Multiplied by its molecular weight
    (C) Multiplied by its density
    (D) Multiplied by its specific weight

11. If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to
    (A) +ve
    (B) -ve
    (C) Zero
    (D) Anywhere between zero and infinity

12. Which is the incorrect statement about Carnot cycle?
    (A) All the heat engines are based on Carnot cycle
    (B) It is used as the alternate standard of comparison of all heat engines
    (C) It provides concept of maximising work output between the two temperature limits
    (D) All of the above

13. The fuel mostly used in steam boilers is
    (A) Brown coal
    (B) Peat
    (C) Coking bituminous coal
    (D) Non-coking bituminous coal

14. An isolated system is one in which
    (A) Mass does not cross boundaries of the system, though energy may do so
    (B) Neither mass nor energy crosses the boundaries of the system
    (C) Both energy and mass cross the boundaries of the system
    (D) Mass crosses the boundary but not the energy

15. Properties of substances like pressure, temperature and density, in thermodynamic coordinates are
    (A) Path functions
    (B) Point functions
    (C) Cyclic functions
    (D) Real functions

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