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What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.)?

A. TR/(T2 - TR) × (T1 - T2)/T1

B. TR/(T2 - TR) × T1/(T1 - T2)

C. TR/(T1 - TR) × (T1 - T2)/T1

D. None of these

Correct Answer :

A. TR/(T2 - TR) × (T1 - T2)/T1


Related Questions

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4

One ton of refrigeration capacity is equivalent to the heat removal rate of

A. 50 kcal/hr

B. 200 BTU/hr

C. 200 BTU/minute

D. 200 BTU/day

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4

Which of the following non-flow reversible compression processes require maximum work?

A. Adiabatic process

B. Isothermal process

C. Isobaric process

D. All require same work

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4

In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in

A. Enhanced COP

B. Decreased COP

C. No change in the value of COP

D. Increased or decreased COP; depending upon the type of refrigerant

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4

Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole. °K

A. 0

B.

C. 50

D. 100

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4

Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in

A. Increased COP

B. Same COP

C. Decreased COP

D. Increased or decreased COP; depending upon the type of refrigerant

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4

dW and dq are not the exact differential, because q and W are

A. State functions

B. Path functions

C. Intensive properties

D. Extensive properties

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4

The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the __________ equation.

A. Gibbs-Duhem

B. Van Laar

C. Gibbs-Helmholtz

D. Margules

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4

The temperature at the eutectic point of the system is the __________ temperature that can be attained in the system.

A. Lowest

B. Highest

C. Average

D. None of these

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4

The necessary and sufficient condition for equilibrium between two phases is

A. The concentration of each component should be same in the two phases

B. The temperature of each phase should be same

C. The pressure should be same in the two phases

D. The chemical potential of each component should be same in the two phases

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4

The heat capacities for the ideal gas state depend upon the

A. Pressure

B. Temperature

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

PVγ = Constant (where, γ = Cp/Cv) is valid for a/an __________ process.

A. Isothermal

B. Isentropic

C. Isobaric

D. Adiabatic

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4

If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g) C3H8(g) will be __________ Kcal.

A. -19.4

B. -30.2

C. 55.2

D. -55.2

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4

A Carnot cycle consists of the following steps:

A. Two isothermal and two isentropic

B. Two isobaric and two isothermal

C. Two isochoric and two isobaric

D. Two isothermals and two isochoric

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4

Pick out the wrong statement.

A. Activity co-efficient is dimensionless.

B. In case of an ideal gas, the fugacity is equal to its pressure.

C. In a mixture of ideal gases, the fugacity of a component is equal to the partial pressure of the component.

D. The fugacity co-efficient is zero for an ideal gas

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4

The unit of fugacity is the same as that of the

A. Pressure

B. Temperature

C. Volume

D. Molar concentration

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4

Mollier diagram is a plot of

A. Temperature vs. enthalpy

B. Temperature vs. enthalpy

C. Entropy vs. enthalpy

D. Temperature vs. internal energy

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4

The internal energy of an ideal gas is a function of its __________ only.

A. Molecular size

B. Volume

C. Pressure

D. Temperature

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4

Out of the following refrigeration cycles, which one has maximum COP?

A. Air cycle

B. Carnot cycle

C. Ordinary vapor compression cycle

D. Vapor compression with a reversible expansion engine

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4

First law of thermodynamics is mathematically stated as

A. dQ = dE + dW

B. dQ = dE - dW

C. dE = dQ + dW

D. dW = dQ + dE

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4

Pick out the correct statement.

A. If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase

B. A process is irreversible as long as Δ S for the system is greater than zero

C. The mechanical work done by a system is always equal to∫P.dV

D. The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

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4

Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is

A. (T2 - T1)/T2

B. (T2 - T1)/T1

C. (T1 - T2)/T2

D. (T1 - T2)/T1

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4

Pick out the wrong statement.

A. The chemical potential of a pure substance depends upon the temperature and pressure

B. The chemical potential of a component in a system is directly proportional to the escaping tendency of that component

C. The chemical potential of ith species (μi) in an ideal gas mixture approaches zero as the pressure or mole fraction (xi) tends to be zero at constant temperature

D. The chemical potential of species 'i' in the mixture (μi) is mathematically represented as,μi = ∂(nG)/∂ni]T,P,nj where, n, ni and nj respectively denote the total number of moles, moles of ith species and all mole numbers except ith species. 'G' is Gibbs molar free energy

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4

What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope?

A. 0

B. 1

C. 2

D. 3

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4

An ideal monatomic gas is taken round the cycle ABCDA as shown below in the P-V diagram. The work done during the cycle is

A. PV

B. 2PV

C. PV/2

D. 0

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4

A refrigerator may be termed as a

A. Heat pump

B. Heat engine

C. Carnot engine

D. None of these

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4

Boiling of liquid is accompanied with increase in the

A. Vapor pressure

B. Specific Gibbs free energy

C. Specific entropy

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

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4

Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature.

A. Infinity

B. Minus infinity

C. Zero

D. None of these

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4

Which of the following identities can be most easily used to verify steam table data for superheated steam?

A. (∂T/∂V)S = (∂p/∂S)V

B. (∂T/∂P)S = (∂V/∂S)P

C. (∂P/∂T)V = (∂S/∂V)T

D. (∂V/∂T)P = -(∂S/∂P)T

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4

The internal energy of an incompressible fluid depends upon its

A. Pressure

B. Temperature

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

Cp - Cv = R is valid for __________ gases.

A. Ideal

B. Very high pressure

C. Very low temperature

D. All of the above