Description : The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is (A) ∞ (B) 1 (C) 0 (D) -ve
Last Answer : (C) 0
Description : Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is (A) 0 (B) ∞ (C) +ve (D) -ve
Last Answer : (A) 0
Description : (∂T/∂P)H is the mathematical expression for (A) Specific heat at constant pressure (Cp) (B) Specific heat at constant volume (Cv) (C) Joule-Thompson co-efficient (D) None of these
Last Answer : (C) Joule-Thompson co-efficient
Description : The equation relating E, P, V and T which is true for all substances under all conditions is given by (∂E/∂V)T = T(∂P/∂T)H - P. This equation is called the (A) Maxwell's equation (B) Thermodynamic equation of state (C) Equation of state (D) Redlich-Kwong equation of state
Last Answer : (B) Thermodynamic equation of state
Description : (1/V) (∂V/∂T)Pis the mathematical expression (A) Joule-Thomson co-efficient (B) Specific heat at constant pressure (Cp) (C) co-efficient of thermal expansion (D) Specific heat at constant volume (CV)
Last Answer : (C) co-efficient of thermal expansion
Description : Cvis given by (A) (∂E/∂T)V (B) (∂E/∂V)T (C) (∂E/∂P)V (D) (∂V/∂T)P
Last Answer : (A) (∂E/∂T)V
Description : Joule-Thomson co-efficient for a perfect gas is (A) Zero (B) Positive (C) Negative (D) None of these
Last Answer : (A) Zero
Description : Joule-Thomson Co-efficient at any point on the inversion curve is (A) ∞ (B) +ve (C) 0 (D) -ve
Description : What is the value of Joule-Thomson co-efficient for an ideal gas? (A) +ve (B) -ve (C) 0 (D) ∞
Description : Joule-Thomson co-efficient depends on the (A) Pressure (B) Temperature (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : Which one is true for a throttling process? (A) A gas may have more than one inversion temperatures (B) The inversion temperature is different for different gases (C) The inversion ... gases (D) The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity
Last Answer : (B) The inversion temperature is different for different gases
Description : Joule-Thomson co-efficient is the ratio of (A) Pressure change to temperature change occuring during adiabatic compression of a gas (B) Pressure change to temperature change occuring during adiabatic ... a gas (D) Temperature change to pressure change occuring during adiabatic throttling of a gas
Last Answer : (D) Temperature change to pressure change occuring during adiabatic throttling of a gas
Description : (∂E/∂T)V is the mathematical expression for (A) CV (B) Enthalpy change (C) Free energy change (D) None of these
Last Answer : (D) None of these
Description : Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/µ) 0.8 (CP .µ/k) 0.4 . This is valid for the value of NRe equal to (A) < 2100 (B) 2100-4000 (C) > 4000 (D) > 10000
Last Answer : (D) > 10000
Description : Maxwell's relation corresponding to the identity, dH = dS = Vdp + ∑μi dni is (A) (∂T/∂V)S, ni = -(∂P/∂S)V, ni (B) (∂S/∂P)T, ni = (∂V/∂T)P, ni (C) (∂S/∂V)T, ni = (∂P/∂T)V, ni (D) (∂T/∂P)S, ni = (∂V/∂S)P, ni
Last Answer : (D) (∂T/∂P)S, ni = (∂V/∂S)P, ni
Description : Which is not constant for an ideal gas? (A) (∂P/∂V)T (B) (∂V/∂T)P (C) (∂P/∂V)V (D) All (A), (B) & (C)
Last Answer : (A) (∂P/∂V)T
Description : The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is (A) (∂T/∂V)S = - (∂P/∂S)V (B) (∂S/∂P)T = - (∂V/∂T)P (C) (∂V/∂S)P = (∂T/∂P)S (D) (∂S/∂V)T = (∂P/∂T)V
Last Answer : (D) (∂S/∂V)T = (∂P/∂T)V
Description : 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
Last Answer : D) (∂V/∂T)P = -(∂S/∂P)T
Description : What is defined as the ratio of the change in temperature to the change in pressure when a real gas is throttled? A. Rankine coefficient B. Kelvin coefficient C. Maxwell-Boltzmann coefficient D. Joule-Thomson coefficient
Last Answer : Joule-Thomson coefficient
Description : Incorrect statement for co-efficient of friction could be that A. The coefficient of friction is denoted by the Greek letter µ. B. The coefficient of friction is directly proportional to ... D. The coefficient of friction is inversely proportional to the force pressing the surfaces together
Last Answer : The coefficient of friction is constant even in the conditions of fast slipping and high contact pressure
Description : 6. Liquefaction of gases cannot be done by (A) Exchange of heat with colder stream (B) Adiabatic expansion through a throttle valve (Joule-Thomson expansion) (C) Merely compressing it beyond critical pressure (D) Adiabatic expansion against a piston or in a turbine
Last Answer : (C) Merely compressing it beyond critical pressure
Description : Claude process of gas liquefaction employs (A) Merely compression of gas beyond its critical pressure (B) Joule-Thomson expansion cooling (C) Heat exchange with colder stream (D) Adiabatic expansion against a piston or in a turbine
Last Answer : (D) Adiabatic expansion against a piston or in a turbine
Description : Linde process of gas liquefaction employs (A) Exchange of heat with colder stream (B) Adiabatic expansion through a throttle valve (Joule-Thomson expansion) (C) Adiabatic expansion against a piston or in a turbine (D) Merely compressing the gas beyond its critical pressure
Last Answer : (B) Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Description : When a gas is expanded from high pressure region to low pressure region; temperature change occurs". This phenomenon is related to the (A) Gibbs-Duhem equation (B) Gibbs-Helmholtz equation (C) Third law of thermodynamics (D) Joule-Thomson effect
Last Answer : (D) Joule-Thomson effect
Description : Throttling (Joule-Thomson effect) process is a constant __________ process. (A) Enthalpy (B) Entropy (C) Pressure (D) None of these
Last Answer : (A) Enthalpy
Description : The principle applied in liquefaction of gases is (A) Adiabatic expansion (B) Joule-Thomson effect (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : Joule-Thomson experiment is (A) Isobaric (B) Adiabatic (C) Isenthalpic (D) Both (B) & (C)
Last Answer : (D) Both (B) & (C)
Description : Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature. (A) Below (B) At (C) Above (D) Either 'b' or 'c'
Last Answer : A) Below
Description : During Joule-Thomson expansion of gases (A) Enthalpy remains constant (B) Entropy remains constant (C) Temperature remains constant (D) None of these
Last Answer : (A) Enthalpy remains constant
Description : Joule-Thomson effect i.e., a throttling process is a constant __________ process. (A) Entropy (B) Temperature (C) Internal energy (D) Enthalpy
Last Answer : (D) Enthalpy
Description : In Joule-Thomson porous plug experiment, the (A) Enthalpy does not remain constant (B) Entire apparatus is exposed to surroundings (C) Temperature remains constant (D) None of these
Description : In case of an ideal gas, Joule Thomson coefficient is -
Last Answer : In case of an ideal gas, Joule Thomson coefficient is - A. Zero B. Positive C. Negative D. Infinite
Description : The Joule. Thomson expansion of a gas is an
Last Answer : The Joule. Thomson expansion of a gas is an A. Isothermal process B. Isochoric process C. Isoenthalpic process D. Isobaric process
Description : In thermodynamics, a throttling process, also called a _________, is a type of isenthalpic process where a liquid or gas is cooled as it passes from a higher pressure state to a lower pressure state. a. Rankine Process b. Carnot Cycle c. Joule-Thomson process d. Refrigeration process
Last Answer : Joule-Thomson process
Description : What is Nusselt number? (A) CP . µ/k (B) hD/k (C) h. CP /µ (D) CP . µ/h
Last Answer : (B) hD/k
Description : Prandtl number is given by (A) CP µ/a (B) hD/k (C) CP µ/k (D) µ/h CP
Last Answer : (C) CP µ/k
Description : Gibbs free energy (G) is represented by, G = H - TS, whereas Helmholtz free energy, (A) is given by, A = E - TS. Which of the following is the Gibbs Helmholtz equation? (A) [∂(G/T)/∂T] = - (H/T2) (B) [∂(A/T)/∂T]V = - E/T2 (C) Both (A) and (B) (D) Neither (A) nor (B)
Description : Type µ H chain is present in (A) Ig G (B) Ig A (C) Ig M (D) Ig D
Last Answer : Answer : C
Description : The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and ... , nj (C) (∂H/∂ni)S, P, nj (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Mass transfer co-efficient is defined as (A) Flux = Co-efficient/concentration difference (B) Co-efficient = Flux/concentration difference (C) Flux=concentration difference/coefficient (D) None of these
Last Answer : (B) Co-efficient = Flux/concentration difference
Description : Co-efficient of discharge (Cd ) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv ; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about (A) 0.42 (B) 0.62 (C) 0.82 (D) 0.98
Last Answer : (B) 0.62
Description : The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same. (A) Kinematic viscosity (B) Work (C) Temperature (D) None of these
Description : Radioactivity was discovered by (1) J.J. Thomson (2) W.Roentgen (3) H.Becquerel (4) M. Curie
Last Answer : (3) H.Becquerel Explanation: Antoine-Henri Becquerel is known for his discovery of radioactivity, for which he received the Nobel Prize for Physics in 1903. Unstable atomic nuclei will spontaneously decompose to form nuclei with a higher stability.
Description : The inventor of the Kelvin temperature scale was: w) K. Cavendish II x) Lord William H. Harrison y) Sir William Thomson z) none of the above
Last Answer : ANSWER: Y -- SIR WILLIAM THOMSON
Description : On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line ... Y (C) (∂P/∂V)S = y(∂P/∂V)T (D) (∂P/∂V)S = 1/y(∂P/∂V)T
Last Answer : (C) (∂P/∂V)S = y(∂P/∂V)T
Description : Farad is defined as: a. Coulomb / volt b. Ampere / volt c. Coulomb / joule d. Joule / Coulomb
Last Answer : d. Joule / Coulomb
Description : The basic filtration equation is given as dt/dV = (µ/A ∆P). [(α .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, μ is viscosity of ... produced? Neglect filter medium resistance, Rm; assume incompressible cake. (A) 10 (B) 20 (C) 25 (D) 30
Last Answer : (B) 20
Description : About 2-3 hp, power per gallon of a thin liquid provides vigorous agitation in an agitator. 'Power number' in agitation is given by (A) P. gc /n 3 . D2 . ρ (B) P. gc . ρ/µ
Last Answer : (A) P. gc /n 3 . D2 . ρ
Description : Schmidt number is given by (A) µ/ρDAB (B) Re × Pe (C) Sh × Pe (D) Re/Pe
Last Answer : (A) µ/ρDAB