MCQOPTIONS
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MCQOPTIONS
This section includes 838 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 701. |
Fundamental principle of refrigeration is based on the __________ law of thermodynamics. |
| A. | zeroth |
| B. | first |
| C. | second |
| D. | third |
| Answer» D. third | |
| 702. |
Degree of freedom of the system ice-water-vapour will be |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 703. |
The standard Gibbs free energy change of a reaction depends on the equilibrium |
| A. | pressure |
| B. | temperature |
| C. | composition |
| D. | all (a), (b) and (c) |
| Answer» C. composition | |
| 704. |
Specific __________ does not change during phase change at constant temperature and pressure. |
| A. | entropy |
| B. | Gibbs energy |
| C. | internal energy |
| D. | enthalpy |
| Answer» C. internal energy | |
| 705. |
__________ increases with increase in pressure. |
| A. | The melting point of wax |
| B. | The boiling point of a liquid |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 706. |
Reduced pressure of a gas is the ratio of its |
| A. | pressure to critical pressure. |
| B. | critical pressure to pressure. |
| C. | pressure to pseudocritical pressure. |
| D. | pseudocritical pressure to pressure. |
| Answer» B. critical pressure to pressure. | |
| 707. |
Filling of gas from a high pressure cylinder into small bottles is an example of a/an __________ process. |
| A. | equilibrium |
| B. | adiabatic |
| C. | steady |
| D. | unsteady |
| Answer» E. | |
| 708. |
Gibbs free energy at constant pressure and temperature under equilibrium conditions is |
| A. | ‚àû |
| B. | 0 |
| C. | maximum |
| D. | minimum |
| Answer» E. | |
| 709. |
Entropy of the system decreases, when |
| A. | snow melts into water. |
| B. | a gas expands spontaneously from high pressure to low pressure. |
| C. | water is converted into ice. |
| D. | both (b) & (c). |
| Answer» E. | |
| 710. |
Which of the following has the minimum value of COP for a given refrigeration effect? |
| A. | Reverse Carnot cycle. |
| B. | Ordinary vapour-compression cycle. |
| C. | Vapour-compression process with a reversible expansion engine. |
| D. | Air refrigeration cycle. |
| Answer» E. | |
| 711. |
Near their critical temperatures, all gases occupy volumes __________ that of the ideal gas. |
| A. | less than |
| B. | same as |
| C. | more than |
| D. | half |
| Answer» B. same as | |
| 712. |
In jet refrigerators, the refrigerating fluid is practically always |
| A. | water |
| B. | ammonia |
| C. | freon |
| D. | brine |
| Answer» B. ammonia | |
| 713. |
Fugacity is most helpful in |
| A. | representing actual behaviour of real gases. |
| B. | representing actual behaviour of ideal gases. |
| C. | the study of chemical equilibria involving gases at atmospheric pressure. |
| D. | none of these |
| Answer» B. representing actual behaviour of ideal gases. | |
| 714. |
The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for$ |
| A. | expansion of a real gas. |
| B. | reversible isothermal volume change. |
| C. | heating of an ideal gas. |
| D. | cooling of a real gas. |
| Answer» C. heating of an ideal gas. | |
| 715. |
Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C and 5.2 atm).$ |
| A. | Pressure must be kept below 5.2 atm. |
| B. | Temperature must be kept above - 57°C. |
| C. | Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C. |
| D. | Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively. |
| Answer» E. | |
| 716. |
Entropy is a measure of the __________ of a system. |
| A. | disorder |
| B. | orderly behaviour |
| C. | temperature changes only |
| D. | none of these |
| Answer» B. orderly behaviour | |
| 717. |
A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres.$ |
| A. | 448 |
| B. | 224 |
| C. | 22.4 |
| D. | data insufficient; can't be computed |
| Answer» B. 224 | |
| 718. |
The number of degrees of freedom at the triple point of water is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 719. |
No work is done by the system, when a reaction occurs at constant |
| A. | volume |
| B. | temperature |
| C. | pressure |
| D. | none of these |
| Answer» B. temperature | |
| 720. |
When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is |
| A. | same in both the phases. |
| B. | zero in both the phases. |
| C. | more in vapour phase. |
| D. | more in liquid phase. |
| Answer» B. zero in both the phases. | |
| 721. |
Equilibrium constant of a reaction varies with the |
| A. | initial concentration of the reactant. |
| B. | pressure. |
| C. | temperature. |
| D. | none of these. |
| Answer» D. none of these. | |
| 722. |
The reaction A (l) R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The number of degrees of freedom are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» C. 3 | |
| 723. |
Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is$ |
| A. | superheated vapour. |
| B. | partially condensed vapour with quality of 0.9. |
| C. | saturated vapour. |
| D. | partially condensed vapour with quality of 0.1. |
| Answer» B. partially condensed vapour with quality of 0.9. | |
| 724. |
The equation, PV = nRT, is best obeyed by gases at |
| A. | low pressure & high temperature. |
| B. | high pressure & low temperature. |
| C. | low pressure & low temperature. |
| D. | none of these. |
| Answer» B. high pressure & low temperature. | |
| 725. |
As the temperature is lowered towards the absolute zero, the value of, then approaches |
| A. | unity |
| B. | zero |
| C. | that of the heat of reaction |
| D. | infinity |
| Answer» C. that of the heat of reaction | |
| 726. |
Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is |
| A. | 300(32/7) |
| B. | 300(33/5) |
| C. | 300(333/7) |
| D. | 300(35/7) |
| Answer» B. 300(33/5) | |
| 727. |
Work done in an adiabatic process between two states depends on the |
| A. | rate of heat transmission |
| B. | initial state only |
| C. | end states only |
| D. | none of these |
| Answer» D. none of these | |
| 728. |
Which of the following is a thermodynamic property of a system ? |
| A. | Concentration |
| B. | Mass |
| C. | Temperature |
| D. | Entropy |
| Answer» E. | |
| 729. |
The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each at 1 atm is |
| A. | -2 RT ln 0.5 |
| B. | -RT ln 0.5 |
| C. | 0.5 RT |
| D. | 2 RT |
| Answer» C. 0.5 RT | |
| 730. |
The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is$ |
| A. | ‚àû |
| B. | 1 |
| C. | 0 |
| D. | #NAME? |
| Answer» D. #NAME? | |
| 731. |
Henry's law is closely obeyed by a gas, when its __________ is extremely high. |
| A. | pressure |
| B. | solubility |
| C. | temperature |
| D. | none of these |
| Answer» E. | |
| 732. |
is 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). |
| Answer» D. specific heat at constant volume (CV). | |
| 733. |
__________ decreases during adiabatic throttling of a perfect gas. |
| A. | Entropy |
| B. | Temperature |
| C. | Enthalpy |
| D. | Pressure |
| Answer» E. | |
| 734. |
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. |
| Answer» C. critical pressure and critical temperature. | |
| 735. |
A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then(where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) |
| A. | Δ S1 is always < Δ SR |
| B. | Δ S1 is sometimes > Δ SR |
| C. | Δ S1 is always > Δ SR |
| D. | Δ S1 is always = Δ SR |
| Answer» D. Œî S1 is always = Œî SR | |
| 736. |
The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is |
| A. | 0 |
| B. | ‚àû |
| C. | #NAME? |
| D. | #NAME? |
| Answer» D. #NAME? | |
| 737. |
In the reaction, C + O2 CO2 ; ΔH = - 94 kcal. What is the heat content (enthalpy)of O2? |
| A. | -94 kcal |
| B. | > -94 kcal |
| C. | < - 94 kcal |
| D. | zero |
| Answer» E. | |
| 738. |
Which of the following is not a reversible process ? |
| A. | Expansion of an ideal gas against constant pressure. |
| B. | Atmospheric pressure vaporisation of water at 100°C. |
| C. | Solution of NaCl in water at 50°C. |
| D. | None of these. |
| Answer» D. None of these. | |
| 739. |
Refrigeration capacity of a household refrigerator may be round about __________ tons. |
| A. | 0.15 |
| B. | 1.5 |
| C. | 4.5 |
| D. | 6.5 |
| Answer» B. 1.5 | |
| 740. |
Specific volume of an ideal gas is |
| A. | equal to its density. |
| B. | the reciprocal of its density. |
| C. | proportional to pressure. |
| D. | none of these. |
| Answer» C. proportional to pressure. | |
| 741. |
A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is |
| A. | zero |
| B. | positive |
| C. | negative |
| D. | none of these |
| Answer» D. none of these | |
| 742. |
The equation Tds = dE - PdV applies to |
| A. | single phase fluid of varying composition. |
| B. | single phase fluid of constant composition. |
| C. | open as well as closed systems. |
| D. | both (b) and (c) |
| Answer» E. | |
| 743. |
Which of the following is true for Virial equation of state ? |
| A. | Virial co-efficients are universal constants. |
| B. | Virial co-efficients 'B' represents three body interactions. |
| C. | Virial co-efficients are function of temperature only. |
| D. | For some gases, Virial equations and ideal gas equations are the same. |
| Answer» D. For some gases, Virial equations and ideal gas equations are the same. | |
| 744. |
When dilute aqueous solutions of two salts are mixed, the process is associated with |
| A. | decrease in temperature. |
| B. | increase in temperature. |
| C. | no change in temperature. |
| D. | change in temperature which is a function of composition. |
| Answer» C. no change in temperature. | |
| 745. |
Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system ? |
| A. | Expansion valve |
| B. | Condenser |
| C. | Refrigerator |
| D. | Compressor |
| Answer» E. | |
| 746. |
Absolute zero temperature signifies the |
| A. | minimum temperature attainable. |
| B. | temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in. |
| C. | temperature of the heat reservoir to which a Carnot engine rejects no heat. |
| D. | none of these. |
| Answer» D. none of these. | |
| 747. |
Degress of freedom at triple point will be |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 748. |
"Dry ice" is |
| A. | moisture free ice |
| B. | solid helium |
| C. | solid carbon dioxide |
| D. | none of these |
| Answer» D. none of these | |
| 749. |
Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the __________ equation. |
| A. | Gibbs-Duhem |
| B. | Maxwell's |
| C. | Clayperon |
| D. | none of these |
| Answer» D. none of these | |
| 750. |
Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)? |
| A. | Air cycle |
| B. | Carnot cycle |
| C. | Ordinary vapour compression cycle |
| D. | Vapour compression with a reversible expansion engine |
| Answer» B. Carnot cycle | |