2951. A heat exchange process in which the product of pressure and volume remains constant is known as_______________?
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A. throttling process

B. isentropic process

C. hyperbolic process

D. heat exchange process

E. adiabatic process

2952. The basis for measuring thermodynamic property of temperature is given by___________________?
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A. third law of thermodynamics

B. first law of thermodynamics

C. zeroth law of thermodynamics

D. second law of thermodynamics

E. Avogadros hypothesis

2953. Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to________________?
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A. 1/Vr

B. J2

C. T

D. j

E. Vr

2954. If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as__________________?
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A. parabolic expansion

B. throttling

C. free expansion

D. adiabatic expansion

E. hyperbolic expansion

2955. Atmospheric pressure is equal to____________?
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A. 1.013 bar

B. All of these

C. 101.3KN/m2

D. 760mm of Hg

2956. An open system is one in which____________________?
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A. mass does not cross boundaries of the system, though energy may do so

B. neither mass nor energy crosses the boundaries of the system

C. both energy and mass cross the boundaries of the system

D. mass crosses the boundary but not the energy

E. thermodynamic reactions do not occur

2957. For which of the following substances, the internal energy and enthalpy are the functions of temperature only____________________?
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A. any gas

B. perfect gas

C. saturated steam

D. superheated steam

E. water

2958. The term N.T.P. stands for________________________?
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A. natural temperature and pressure

B. normal thermodynamic pressure

C. normal thermodynamic practice

D. nominal temperature and pressure

E. normal temperature and pressure
2959. An engine operates between temperatures of 900Kandr2 and another engine between T2 and 400K For both to do equal work, value of T2 will be________________?
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A. 750K

B. 625K

C. 600K

D. 700K

E. 650K
2960. Thermal power plant works on______________?
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A. Rankine cycle

B. Carnot cycle

C. Joule cycle

D. Brayton cycle

E. Otto cycle

2961. The unit of time in S.I. units is__________________?
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A. day

B. second

C. minute

D. hour

E. year.

2962. Superheated vapour behaves___________________?
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A. approximately as a gas

B. as average of gas and vapour

C. exactly as gas

D. as steam

E. as ordinary vapour

2963. Gases have___________________?
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A. under some conditions one value and sometimes two values of specific heat

B. two values of specific heat

C. three values of specific heat

D. no value of specific heat

E. only one value of specific heat

2964. To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is____________________?
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A. multiplied by its specific weight

B. divided by its molecular weight

C. divided by its specific weight

D. multiplied by its molecular weight

E. multiplied by its density

2965. On weight basis, air contains following parts of oxygen_________________?
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A. 21

B. 25

C. 23

D. 73

E. 79

2966. The unit of mass in S.I. units is ____________________?
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A. kilogram

B. tonne

C. gram

D. quintal

E. newton

2967. If value of n is infinitely large in a polytropic process pV = C, then the process is known as constant_____________________?
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A. entropy

B. volume

C. enthalpy

D. temperature

E. pressure

2968. On volume basis, air contains following parts of oxygen _____________________?
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A. 79

B. 21

C. 23

D. 77

E. 25

2969. Entropy change depends on___________________?
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A. mass transfer

B. change of temperature

C. change of pressure and volume

D. thermodynamic state

E. heat transfer
2970. The unit of length in S.I. units is________________?
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A. kilometer

B. meter

C. centimeter

D. millimeter

2971. The unitof universal gas constant is___________________?
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A. erg/K

B. watts/K

C. ergscm/K

D. dynes/C

E. none of the above

2972. The efficiency of a Carnot engine depends on_______________________?
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A. type of fuel fired

B. design of engine

C. working substance

D. size of engine

E. temperatures of source and sink
2973. Diesel cycle consists of following four processes_________________?
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A. two isentropics and two constant pressures

B. two isentropics, one constant volume and one constant pressure

C. two isentropics, and two constant volumes.

D. two isothermals and two isentropics

E. none of the above

2974. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly_________________?
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A. internal energy

B. enthalpy

C. temperature

D. all of the above

E. entropy
2975. No liquid can exist as liquid at____________________?
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A. in space

B. centre of earth

C. vacuum

D. 273 K

E. zero pressure
2976. If a certain amount of dry ice is mixed with same amount of water at 80C, the final temperature of mixture will be__________________?
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A. 0C

B. 80C

C. 20C

D. 40C

E. 60C

2977. The efficiency of Carnot cycle is maximum for_____________________?
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A. well lubricated engine

B. steam engine

C. gas engine

D. petrol engine

E. reversible engine
2978. Isochoric process is one in which___________________?
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A. free expansion takes place

B. very little mechanical work is done by the system

C. no mechanical work is done by the system

D. mass and energy transfer do not take place

E. all parameters remain constant

2979. Total heat of a substance is also known as __________________?
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A. thermal capacity

B. enthalpy

C. thermal conductance

D. entropy

E. internal energy

2980. Extensive property of a system is one whose value______________________?
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A. is dependent on the path followed and not on the state

B. is not dependent on the path followed but on the state

C. depends on the mass of the system like volume

D. does not depend on the mass of the system, like temperature, pressure, etc.

E. is always constant

2981. A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227 C and 27 C. His claim is__________________?
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A. may be possible with lot of sophistications

B. theroretically possible

C. cost will be very high

D. not possible

E. justified

2982. Calorie is a measure of
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A. work

B. thermal capacity

C. entropy

D. specific heat

E. quantity of heat
2983. Which of the following is the property of a system___________________?
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A. enthalpy and entropy

B. pressure and temperature

C. volume and density

D. all of the above

E. internal energy

2984. For which of the following substances, the gas laws can be used with minimum error_________________?
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A. wet steam

B. dry steam

C. saturated steam

D. superheated steam

E. steam at atmospheric pressure

2985. In an isothermal process, the internal energy of gas molecules________________?
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A. decreases

B. increases

C. remains constant

D. may increase/decrease depending on the properties of gas

E. shows unpredictable behaviour

2986. A cycle consisting of two adiabatics and two constant pressure processes is known as___________________?
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A. Stirling cycle

B. Ericsson cycle

C. Atkinson cycle

D. Joule cycle

E. Otto cycle

2987. The more effective way of increasing efficiency of Carnot engine is to____________________?
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A. increase higher temperature

B. keep lower temperature constant

C. increase lower temperature

D. decrease lower temperature

E. decrease higher temperature

2988. Stirling and Ericsson cycles are__________________?
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A. reversible cycles

B. semi-reversible cycles

C. adiabatic irreversible cycles

D. quasi-static cycles

E. irreversible cycles

2989. According to kinetic theory of gases, the absolute zero temperature is attained when___________________?
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A. kinetic energy of the molecules is zero

B. specific heat of gas is zero

C. mass is zero

D. pressure of the gas is zero

E. volume of the gas is zero

2990. Work done in an adiabatic process between a given pair of end states depends on__________________?
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A. particular adiabatic process

B. the value of index n

C. the end states only

D. the value of heattransferred

E. mass of the system

2991. The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is________________?
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A. All J/kmol K

B. 83.14J/kmolK

C. 29.27 J/kmolK

D. 848J/kmolK

E. 735 J/kmol K

2992. Work done in a free expansion process is___________________?
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A. zero

B. #NAME?

C. #NAME?

D. minimum

E. maximum

2993. The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is______________________?
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A. 848kgfm/molK

B. 735 kgfm/molK

C. 8314kgfm/molK

D. 29.27 kgfm/molK

E. 427kgfm/molK

2994. The energy of molecular motion appears as________________?
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A. potential energy

B. heat

C. surface tension

D. increase in pressure

E. friction

2995. Which of the following cycles has maximum efficiency_____________?
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A. Rankine

B. Carnot

C. Brayton

D. Stirling

E. Joule

2996. Kelvin Plancks law deals with___________________?
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A. conservation of mass

B. conversion of heat into work

C. conservation of work

D. conversion fo work into heat

E. conservation of heat

2997. The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that___________________?
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A. none of the above

B. heat is supplied to water at temperature below the maximum temperature of the cycle

C. carnot cycle cant work with saturated steam

D. a rankine cycle receives heat at two places

E. rankine cycle is hypothetical

2998. The same volume of all gases would represent their____________________?
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A. molecular weights

B. gas characteristic constants

C. densities

D. specific gravities

E. specific weights

2999. The ratio of two specific heats of air is equal to____________________?
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A. 0.17

B. 0.24

C. 1.41

D. 2.71

E. 0.1

3000. Properties of substances like pressure, temperature and density, in thermodynamic coordinates are__________________?
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A. real functions

B. point functions

C. path functions

D. thermodynamic functions

E. cyclic functions