Thermodynamics free Model online Quiz Test2

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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

Thermodynamics Quiz practies questions test1

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Test your caliber

1.Which of the following variables controls the physical properties of a perfect gas ____.
pressure	temperature
volume	all of the above

2.Which of the following laws is applicable for the behaviour of a perfect gas
Boyle's law	Charles'law
Gay-Lussac law	all of the above

3.The unit of temperature in S.I. units is _____.
Centigrade	Celsius
Fahrenheit	Kelvin

4.The unit of mass in S.I. units is ______.
kilogram	gram
tonne	quintal

5.The unit of time in S.I. units is _____.
second	minute
hour	day

6.The unit of length in S.I. units is _____.
metre	centimetre
kilometre	millimetre

7.The unit of energy in S.I. units is _____.
watt	joule
joule/s	joule/m

8.According to Gay-Lussac law for a perfect gas, the absolute pressure of given mass varies directly as
temperature	absolute
absolute temperature, if volume is kept constant	volume, if temperature is kept constant

9.An ideal gas as compared to a real gas at very high pressure occupies
more volume	less volume
same volume	unpredictable behaviour

10.General gas equation is _____.
PV=nRT	PV=mRT
PV = C	PV=KiRT

11.According to Dalton's law, the total pres sure of the mixture of gases is equal to _____.
greater of the partial pressures of all	average of the partial pressures of all
sum of the partial pressures of all	atmospheric pressure

12.Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits.
02, N2, steam, C02	Oz, N2, water vapour
S02, NH3, C02, moisture	02, N2, H2, air

13.The unit of pressure in S.I. units is ______.
kg/cm2	mm of water column
pascal	dynes per square cm

14.A closed system is one in which _____.
mass does not cross boundaries of the system, though energy may do so	mass crosses the boundary but not the energy
neither mass nor energy crosses the boundaries of the system	both energy and mass cross the boun-daries of the system

15.Temperature of a gas is produced due to ______.
its heating value	kinetic energy of molecules
repulsion of molecules	attraction of molecules

16.According to kinetic theory of gases, the absolute zero temperature is attained when
volume of the gas is zero	pressure of the gas is zero
kinetic energy of the molecules is zero	specific heat of gas is zero

17.Kinetic theory of gases assumes that the collisions between the molecules are ______.
perfectly elastic	perfectly inelastic
partly inelastic	partly elastic and partly inelastic

18.The pressure'of a gas in terms of its mean kinetic energy per unit volume E is equal to _____.
E/3	E/2
3E/4	2E/3

19.Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to _____.
T	j
J2	Vr

20.Superheated vapour behaves _____.
exactly as gas	as steam
as ordinary vapour	as average of gas and vapour

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