4

# Pick out the wrong statement

Phase rule variables are intensive properties

Heat and work are both state function

The work done by expansion of a gas in vacuum is zero

CP and CV are state function

B. Heat and work are both state function

4

# Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are

Always greater than one

Same at the same reduced temperature

Same at the same reduced pressure

Both (B) & (C)

4

# Refrigerants commonly used for domestic refrigerators are

Ethyl chloride or methyl chloride

Freon-12

Propane

NH3 or CO2

4

RT ln K

-RT ln K

-R ln K

T ln K

4

-ve

0

+ve

4

Isobaric

Isothermal

None of these

4

# Chemical potential is a/an

Extensive property

Intensive property

Force which drives the chemical system to equilibrium

Both (B) and (C)

4

dE = CpdT

dE = CvdT

dQ = dE + pdV

dW = pdV

4

# In an irreversible process

Tds = dE - dW = 0

dE - dW - Tds = 0

Tds - dE + dW < 0

Tds - dT + dW < 0

4

# Which of the following processes cannot be made reversible even under ideal condition of operation?

Free expansion of a gas

Compression of air in a compressor

Expansion of steam in a turbine

All (A), (B) & (C)

4

# In Joule-Thomson porous plug experiment, the

Enthalpy does not remain constant

Entire apparatus is exposed to surroundings

Temperature remains constant

None of these

4

Sublimation

Fusion

Transition

Vaporisation

4

# A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

Vapor compression cycle using expansion valve

Air refrigeration cycle

Vapor compression cycle using expansion engine

Carnot refrigeration cycle

4

# In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, the Carnot COP will be

5.2

6.2

0.168

Data insufficient, can't be found out

4

# For an exothermic reaction

Only enthalpy change (ΔH) is negative

Only internal energy change (ΔE) is negative

Both ΔH and ΔE are negative

Enthalpy change is zero

4

# Absolute zero temperature signifies the

Minimum temperature attainable

Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in

Temperature of the heat reservoir to which a Carnot engine rejects no heat

None of these

4

CO2

H2

O2

N2

4

# For an isothermal process, the internal energy of a gas

Increases

Decreases

Remains unchanged

Data insufficient, can't be predicted

4

6738.9

6753.5

7058.3

9000

4

0

1

2

3

4

Molten sodium

Mercury

Molten potassium

4

Enthalpy

Pressure

Entropy

None of these

4

# Which of the following is affected by the temperature?

Fugacity

Activity co-efficient

Free energy

All (A), (B) & (C)

4

Gibbs-Duhem

Gibbs-Helmholtz

Maxwell's

None of these

4

50 kcal/hr

200 BTU/hr

200 BTU/minute

200 BTU/day

4

# Heat of reaction at constant volume is identified with __________ change.

Enthalpy

Internal energy

Either (A) or (B)

Neither (A) nor (B)

4

# Which of the following is not affected by temperature changes?

Fugacity

Activity co-efficient

Free energy

None of these

4

# Boiling of liquid is accompanied with increase in the

Vapor pressure

Specific Gibbs free energy

Specific entropy

All (A), (B) and (C)

4

Isothermal

Isobaric

Isochoric

4

# Heat of formation of an element in its standard state is

0

< 0

> 0

A function of pressure