Engineering Thermodynamics Questions And Answers - Set 27 - ObjectiveBooks
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# 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

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

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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