Mechanical Engineering Thermodynamics - Set 10 - ObjectiveBooks

# Practice Test: Question Set - 10

1. The gas constant (R) is equal to the __________ of two specific heats.
(A) Product
(B) Sum
(C) Difference
(D) Ratio

2. A sudden fall in the barometer reading is a sign of approaching
(A) Fine weather
(B) Rains
(C) Storm
(D) Cold wave

3. The unit of universal gas constant is
(A) watts/°K
(B) dynes/°C
(C) erg/°K
(D) None of the above

4. Calorie is a measure of
(A) Specific heat
(B) Quantity of heat
(C) Thermal capacity
(D) Entropy

5. 1 kgf/cm² is equal to
(A) 760 mm Hg
(B) Zero mm Hg
(C) 735.6 mm Hg
(D) 1 mm Hg

6. In an isothermal process
(A) There is no change in enthalpy
(B) There is no change in internal energy
(C) There is no change in temperature
(D) All of these

7. Kelvin-Planck’s law deals with
(A) Conservation of work
(B) Conservation of heat
(C) Conversion of work into heat
(D) Conversion of heat into work

8. Barometric pressure is equal to
(A) 760 mm Hg
(B) Zero mm Hg
(C) 735.6 mm Hg
(D) 1 mm Hg

9. Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
(A) Heat rejection is lower
(B) Expansion and compression are isentropic
(C) Combustion is at constant volume
(D) Maximum temperature is higher

10. The value of gas constant (R) in S. I. units is
(A) 0.287 J/kgK
(B) 2.87 J/kgK
(C) 28.7 J/kgK
(D) 287 J/kgK

11. One barometric pressure or 1 atmospheric pressure is equal to
(A) 1 kgf/cm²
(B) 1.033 kgf/cm²
(C) 0 kgf/cm²
(D) 1.0197 kgf/cm²

12. The first law of thermodynamics is the law of
(A) Conservation of mass
(B) Conservation of energy
(C) Conservation of momentum
(D) Conservation of heat

13. A perpetual motion machine is
(A) A thermodynamic machine
(B) A non-thermodynamic machine
(C) A hypothetical machine
(D) A hypothetical machine whose operation would violate the laws of thermodynamics

14. Kelvin Planck's law deals with
(A) Conservation of heat
(B) Conservation of work
(C) Conversion of heat into work
(D) Conversion of work into heat

15. The pressure exerted by an ideal gas is ________ of the kinetic energy of all the molecules contained in a unit volume of gas.
(A) One-third
(B) Three-forth
(C) One-half
(D) Two-third

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