Mechanical Engineering Thermodynamics - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. According to Dalton's law, the total pressure of the mixture of gases is equal to
(A) Greater of the partial pressures of all
(B) Average of the partial pressures of all
(C) Sum of the partial pressures of all
(D) Sum of the partial pressures of all divided by average molecular weight

2. Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?
(A) O₂, N₂, steam, CO₂
(B) O₂, N₂, water vapour
(C) SO₂, NH₃, CO₂, moisture
(D) O₂, N₂, H₂, air

3. The measurement of a thermodynamic property known as temperature is based on
(A) First law of thermodynamics
(B) Second law of thermodynamics
(C) Zeroth law of thermodynamics
(D) None of these

4. For a perfect gas, according to Boyle’s law (where P = Absolute pressure, V = Volume and T = Absolute temperature)
(A) V/T = constant, if p is kept constant
(B) P v = constant, if T is kept constant
(C) T/P = constant, if v is kept constant
(D) P/T = constant, if v is kept constant

5. The gas turbine cycle with regenerator improves
(A) Work ratio
(B) Thermal efficiency
(C) Avoid pollution
(D) None of these

6. The compression ratio is the ratio of
(A) Total volume to swept volume
(B) Swept volume to clearance volume
(C) Swept volume to total volume
(D) Total volume to clearance volume

7. The unit of pressure in S.I. units is
(A) kg/cm²
(B) mm of water column
(C) Pascal
(D) Dyne per square cm

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

9. Temperature of a gas is produced due to
(A) Its heating value
(B) Kinetic energy of molecules
(C) Repulsion of molecules
(D) Surface tension of molecules

10. According to kinetic theory of gases, the absolute zero temperature is attained when
(A) Volume of the gas is zero
(B) Pressure of the gas is zero
(C) Kinetic energy of the molecules is zero
(D) Specific heat of gas is zero

11. Those substances which have so far not been resolved by any means into other substances of simpler form are called
(A) Atoms
(B) Compounds
(C) Elements
(D) Molecules

12. Coke is produced
(A) When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
(B) From the finely ground coal by moulding under pressure with or without a binding material
(C) When coal is first dried and then crushed to a fine powder by pulverizing machine
(D) By heating wood with a limited supply of air to a temperature not less than 280°C

13. The hard coke is obtained when carbonization of coal is carried out at
(A) 500° to 700°C
(B) 700° to 900°C
(C) 300° to 500°C
(D) 900° to 1100°C

14. Which of the following is an intensive property of a thermodynamic system?
(A) Mass
(B) Temperature
(C) Energy
(D) Volume

15. Otto cycle is also known as
(A) Constant pressure cycle
(B) Constant volume cycle
(C) Constant temperature cycle
(D) Constant temperature and pressure cycle

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