Engineering Thermodynamics Questions And Answers - Set 27

Practice Test: Question Set - 27


1. The general law for the expansion or compression of gases, is
    (A) pv = C
    (B) pv = m R T
    (C) pvn = C
    (D) pvγ = C

2. The principal constituents of a fuel are
    (A) Carbon and hydrogen
    (B) Oxygen and hydrogen
    (C) Sulphur and oxygen
    (D) Sulphur and hydrogen

3. The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is
    (A) 23.97 bar
    (B) 25 bar
    (C) 26.03 bar
    (D) 34.81 bar

4. High air-fuel ratio in gas turbines
    (A) Increases power output
    (B) Improves thermal efficiency
    (C) Reduces exhaust temperature
    (D) Do not damage turbine blades

5. The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
    (A) 0.086
    (B) 1.086
    (C) 1.086
    (D) 4.086

6. One molecule of oxygen consists of __________ atoms of oxygen.
    (A) 2
    (B) 4
    (C) 8
    (D) 16

7. A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as
    (A) Reversible cycle
    (B) Irreversible cycle
    (C) Thermodynamic cycle
    (D) None of these

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

9. The hyperbolic process is governed by
    (A) Boyle's law
    (B) Charles' law
    (C) Gay-Lussac law
    (D) Avogadro's law

10. According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.
    (A) Remains constant
    (B) Increases
    (C) Decreases
    (D) None of these

11. The ultimate analysis of coal consists of the determination of the percentage of
    (A) Carbon
    (B) Hydrogen and nitrogen
    (C) Sulphur and ash
    (D) All of these

12. The heating of gas at constant volume is governed by
    (A) Boyle's law
    (B) Charles' law
    (C) Gay-Lussac law
    (D) Avogadro's law

13. In a steady flow process, the ratio of
    (A) Heat transfer is constant
    (B) Work transfer is constant
    (C) Mass flow at inlet and outlet is same
    (D) All of these

14. The entropy may be expressed as a function of
    (A) Pressure and temperature
    (B) Temperature and volume
    (C) Heat and work
    (D) All of these

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

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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
  Set 28      Set 29      Set 30
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