Thermodynamics Online Practice Test Papers

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1.The following cycle is used for air craft refrigeration ____.
Brayton cycle	Joule cycle
Carnot cycle	Reversed-Brayton cycle

2.The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will _____.
increase	decrease
remain unchanged	increase/decrease depending on ap-plication

3.The ideal efficiency of a Brayton cycle without regeneration with increase ni pressure ratio will.
increase	decrease
remain unchanged	increase/decrease depending on application

4.Which of the following cycles has maximum efficiency ______.
Rankine	Stirling
Carnot	Brayton

5.The efficiency of Diesei cycle with decrease in cut off _____.
increases	decreases
remains unaffected	first increases and then decreases

6.The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as _____.
Dual combustion cycle	Diesel cycle
Atkinson cycle	Rankine cycle

7.Which of the following cycles is not a reversible cycle
Carnot	Ericsson
Stirling	none of the above

8.Brayton cycle consists' of following four processes
two isothermals and two isentropics	two isentropics and two constant volumes
two isentropics, one constant volume and one constant pressure	two isentropics and two constant pressures

9.Reversed joule cycle is called ______.
Carnot cycle	Rankine cycle
Brayton cycle	Bell Coleman cycle

10.A cycle consisting of two adiabatics and two constant pressure processes is known as _____.
Otto cycle	Ericsson cycle
Joule cycle	Stirling cycle

11.Stirling and Ericsson cycles are _____.
reversible cycles	irreversible cycles
quasi-static cycles	semi-reversible cycles

12.If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle
more	less
equal	depends on other factors

13.Diesel cycle consists of following four processes ______.
two isothermals and two isentropics	two isentropics, and two constant volumes
two isentropics, one constant volume and one constant pressure	two isentropics and two constant pres-sures

14.Carnot cycle is _____.
a reversible cycle	an irreversible cycle
a quasi static cycle	a semi-reversible cycle

15.The efficiency of Carnot cycle is maximum for ______.
gas engine	well lubricated engine
petrol engine	steam engine

16.For same compression ratio and for same heat added
Otto cycle is more efficient than Diesel cycle	Diesel cycle is more efficient than Otto cycle
efficiency depends on other factors	both Otto and Diesel cycles are equally efficient

17.The efficiency of a Carnot engine depends on ______.
working substance	design of engine
size of engine	type of fuel fired

18.Otto cycle consists of following four processes _____.
two isothermals and two isentropics	two isentropics and two constant volumes
two isentropics, one constant volume and one constant pressure	two isentropics and two constant pressures

19.Which of the following is an irreversible cycle _____.
carnot	Stirling
ericsson	none of the above

20.Thermal power plant works on _____.
Carnot cycle	Joule cycle
Rankine cycle	Otto cycle