Engineering Thermodynamics MCQ Practice Tests - ObjectiveBooks

# Practice Test: Question Set - 30

1. All perfect gases change in volume by 1/273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called
(A) Boyle's law
(B) Charles' law
(C) Gay-Lussac law
(D) Joule's law

2. When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
(A) Zero
(B) 1/5
(C) 4/5
(D) 1

3. The atomic mass of oxygen is
(A) 8
(B) 18
(C) 16
(D) 32

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

5. Which of the following process can be made reversible with the help of a regenerator?
(A) Constant pressure process
(B) Constant volume process
(C) Constant pvn process
(D) All of these

6. One kg of carbon produces __________ kg of carbon dioxide.
(A) 3/7
(B) 7/3
(C) 11/3
(D) 3/11

7. The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)
(A) Ru × T
(B) 1.5 Ru × T
(C) 2 Ru × T
(D) 3 Ru × T

8. If in the equation pvn = C, the value of n = ∝, then the process is called
(A) Constant volume process
(C) Constant pressure process
(D) Isothermal process

9. The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).
(A) Less than
(B) Equal to
(C) More than
(D) None of these

10. One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.
(A) 4/7
(B) 11/4
(C) 9/7
(D) All of these

11. The efficiency of Diesel cycle depends upon
(A) Temperature limits
(B) Pressure ratio
(C) Compression ratio
(D) Cut-off ratio and compression ratio

12. The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)
(A) (T1/T2) - 1
(B) 1 - (T1/T2)
(C) 1 - (T2/T1)
(D) 1 + (T2/T1)

13. The gas in cooling chamber of a closed cycle gas turbine is cooled at
(A) Constant volume
(B) Constant temperature
(C) Constant pressure
(D) None of these

14. When coal is first dried and then crushed to a fine powder by pulverizing machine, the resulting fuel is called
(A) Wood charcoal
(B) Bituminous coal
(C) Briquetted coal
(D) None of these

15. The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that
(A) Carnot cycle can't work with saturated steam
(B) Heat is supplied to water at temperature below the maximum temperature of the cycle
(C) A Rankine cycle receives heat at two places
(D) Rankine cycle is hypothetical

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