Chemical Engineering Mcqs

Helmholtz free energy A. is defined as____________________?

(A) A = H – TS
(B) A = E – TS
(C) A = H + TS
(D) None of these

Submitted By :Ali Uppal

Which of the following is not affected by temperature changes ?

(A) Fugacity
(B) Activity co-efficient
(C) Free energy
(D) None of these

Submitted By :Ali Uppal

Which of the following will increase the volume of a real gas by four times ?

(A) Doubling the absolute temperature as well as pressure of the gas
(B) Reducing pressure to one fourth at constant temperature
(C) Reducing temperature to one fourth at constant pressure
(D) Reducing the temperature to half and doubling the pressure

Submitted By :Ali Uppal

Compressibility factor for almost all the gases are approximately same at the same__________________?

(A) Pressure and temperature
(B) Reduced pressure and reduced temperature
(C) Critical pressure and critical temperature
(D) None of these

Submitted By :Ali Uppal

High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process ?

(A) Δ H = 0 and ΔS = 0
(B) Δ H ≠ 0 and ΔS = 0
(C) Δ H ≠ 0 and ΔS ≠ 0
(D) Δ H = 0 and ΔS ≠ 0

Submitted By :Ali Uppal

Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a _____________ vapour?

(A) Superheated
(B) Desuperheated
(C) Non-condensable
(D) None of these

Submitted By :Ali Uppal

1st law of thermodynamics is nothing but the law of conservation of___________________?

(A) Momentum
(B) Mass
(C) Energy
(D) None of these

Submitted By :Ali Uppal

The third law of thermodynamics states that the__________________?

(A) Heat capacity of a crystalline solid is zero at absolute zero temperature
(B) Heat transfer from low temperature to high temperature source is not possible without external work
(C) Gases having same reduced properties behaves similarly
(D) None of these

Submitted By :Ali Uppal

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

Submitted By :Ali Uppal

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

Submitted By :Ali Uppal

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