Engineering Thermodynamics Questions And Answers - Set 21 - ObjectiveBooks

# Practice Test: Question Set - 21

1. The efficiency of Stirling cycle is __________ Carnot cycle.
(A) Greater than
(B) Less than
(C) Equal to
(D) None of these

2. The entropy of water at 0°C is assumed to be
(A) 1
(B) 0
(C) -1
(D) 10

3. Producer gas is obtained by
(A) Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
(B) Carbonization of bituminous coal
(C) Passing steam over incandescent coke
(D) Passing air and a large amount of steam over waste coal at about 650°C

4. For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.
(A) Greater than
(B) Less than
(C) Equal to
(D) None of these

5. The efficiency of the Carnot cycle may be increased by
(A) Increasing the highest temperature
(B) Decreasing the highest temperature
(C) Increasing the lowest temperature
(D) Keeping the lowest temperature constant

6. The atomic mass of nitrogen is __________ oxygen.
(A) Equal to
(B) Less than
(C) More than
(D) None of these

7. A definite area or a space where some thermodynamic process takes place is known as
(A) Thermodynamic system
(B) Thermodynamic cycle
(C) Thermodynamic process
(D) Thermodynamic law

8. The absolute zero pressure will be
(A) When molecular momentum of the system becomes zero
(B) At sea level
(C) At the temperature of - 273 K
(D) At the center of the earth

9. The work ratio of simple gas turbine cycle depends upon
(A) Maximum cycle temperature
(B) Minimum cycle temperature
(C) Pressure ratio
(D) All of these

10. In closed cycle gas turbine, the air is compressed
(A) Isothermally
(B) Isentropically
(C) Polytropically
(D) None of these

11. The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)
(A) rÎ³ - 1
(B) 1 - rÎ³ - 1
(C) 1 - (1/r) Î³/Î³ - 1
(D) 1 - (1/r) Î³ - 1/ Î³

12. A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as
(A) Cracking
(B) Carbonization
(C) Fractional distillation
(D) Full distillation

13. One kg of carbon monoxide requires 4/7 kg of oxygen and produces
(A) 11/3 kg of carbon dioxide gas
(B) 7/3 kg of carbon monoxide gas
(C) 11/7 kg of carbon dioxide gas
(D) 8/3 kg of carbon monoxide gas

14. Petrol is distilled at
(A) 65° to 220°C
(B) 220° to 345°C
(C) 345° to 470°C
(D) 470° to 550°C

15. The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and Î³ = Ratio of specific heats)
(A) 1 - rÎ³ - 1
(B) 1 + rÎ³ - 1
(C) 1 - (1/ rÎ³ - 1)
(D) 1 + (1/ rÎ³ - 1)

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Engineering Thermodynamics:
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