Thermodynamics

51. For which of the following substances, the internal energy and enthalpy are the functions of temperature only

1. any gas
2. saturated steam
3. water
4. perfect gas
5. superheated steam.

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52. Gas turbine cycle consists of

1. two isothermals and two isentropics
2. two isentropics and two constant volumes
3. two isentropics, one constant volume and one constant pressure
4. two isentropics and two constant pressures
5. none of the above.

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53. Gases have

1. only one value of specific heat
2. two values of specific heat
3. three values of specific heat
4. no value of specific heat
5. under some conditions one value and sometimes two values of specific heat.

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54. General gas equation is

1. PV=nRT
2. PV=mRT
3. PV = C
4. PV=KiRT
5. Cp-Cv = Wj

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55. Heat and work are

1. point functions
2. system properties
3. PV=mRT
4. intensive properties
5. extensive properties.

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56. I kgf/cm2 is equal to

1. 760 mm Hg
2. zero mm Hg
3. 735.6 mm Hg
4. 1 mm Hg
5. lOOmmHg.

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57. If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be

1. 80°C
2. 0°C
3. 40°C
4. 20°C
5. 60°C.

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58. If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called

1. free expansion
2. hyperbolic expansion
3. adiabatic expansion
4. parabolic expansion
5. throttling.

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59. Which of the following items is not a path function

1. heat
2. work
3. kinetic energy
4. vdp
5. thermal conductivity.

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60. If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as

1. free expansion
2. hyperbolic expansion
3. adiabatic expansion
4. parabolic expansion
5. throttling.

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