Thermodynamics Online Practice Test - Set 15 - ObjectiveBooks
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# Practice Test: Question Set - 15

1. Stirling and Ericsson cycles are
(A) Reversible cycles
(B) Irreversible cycles
(C) Semi-reversible cycles
(D) Adiabatic irreversible cycles

2. A cycle consisting of two adiabatic and two constant pressure processes is known as
(A) Otto cycle
(B) Ericsson cycle
(C) Joule cycle
(D) Stirling cycle

3. Reversed joule cycle is called
(A) Carnot cycle
(B) Rankine cycle
(C) Brayton cycle
(D) Bell Coleman cycle

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

5. The absolute zero temperature is taken as
(A) 237°C
(B) -273°C
(C) -237°C
(D) 273°C

6. Brayton cycle consists' of following four processes
(A) Two isothermal and two isentropic
(B) Two isentropic and two constant volumes
(C) Two isentropic, one constant volume and one constant pressure
(D) Two isentropic and two constant pressures

7. Which of the following cycles is not a reversible cycle?
(A) Carnot
(B) Ericsson
(C) Stirling
(D) None of the above

8. The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as
(A) Dual combustion cycle
(B) Diesel cycle
(C) Atkinson cycle
(D) Rankine cycle

9. The efficiency of Diesel cycle with decrease in cut-off
(A) Increases
(B) Decreases
(C) First increases and then decreases
(D) First decreases and then increases

10. Which of the following cycles has maximum efficiency?
(A) Rankine
(B) Stirling
(C) Carnot
(D) Brayton

11. Which of the following is correct?
(A) Gauge pressure = Absolute pressure + Atmospheric pressure
(B) Absolute pressure = Gauge pressure + Atmospheric pressure
(C) Absolute pressure = Gauge pressure - Atmospheric pressure
(D) Atmospheric pressure = Absolute pressure + Gauge pressure

12. The efficiency and work ratio of a simple gas turbine cycle are
(A) Very low
(B) Low
(C) High
(D) Very high

13. The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
(A) Increase
(B) Decrease
(C) Remain unchanged
(D) Increase/decrease depending on application

14. The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will
(A) Increase
(B) Decrease
(C) Remain unchanged
(D) Increase/decrease depending on application

15. The following cycle is used for air craft refrigeration
(A) Brayton cycle
(B) Joule cycle
(C) Carnot cycle
(D) Reversed Brayton cycle

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