MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1801. |
Extensive properties of a thermodynamic system depend upon the __________ of the system. |
| A. | specific volume |
| B. | temperature |
| C. | mass |
| D. | pressure |
| Answer» D. pressure | |
| 1802. |
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. | |
| 1803. |
If an ideal solution is formed by mixing two pure liquids in any proportion, then the __________ of mixing is zero. |
| A. | enthalpy |
| B. | volume |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» D. neither 'a' nor 'b' | |
| 1804. |
Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation. |
| A. | polar |
| B. | non-polar |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) & (b) | |
| 1805. |
Activity co-efficient is a measure of the |
| A. | departure from ideal solution behaviour. |
| B. | departure of gas phase from idea] gas law. |
| C. | vapour pressure of liquid. |
| D. | none of these. |
| Answer» B. departure of gas phase from idea] gas law. | |
| 1806. |
While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is |
| A. | infinity |
| B. | unity |
| C. | constant |
| D. | negative |
| Answer» D. negative | |
| 1807. |
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. | |
| 1808. |
Emission of -particles during radioactive decay of a substance is from |
| A. | innermost shell |
| B. | nucleus |
| C. | outermost shell |
| D. | none of these |
| Answer» C. outermost shell | |
| 1809. |
Percentage of U-238 in natural uranium is around |
| A. | 0.71 |
| B. | 99.29 |
| C. | 0.015 |
| D. | 29.71 |
| Answer» C. 0.015 | |
| 1810. |
Fuel for a nuclear reactor (thermal) is |
| A. | uranium |
| B. | plutonium |
| C. | radium |
| D. | none of these |
| Answer» B. plutonium | |
| 1811. |
Atoms with same number of neutrons, but different number of nucleons are called |
| A. | isotones |
| B. | isobars |
| C. | isotopes |
| D. | isoters |
| Answer» B. isobars | |
| 1812. |
Which of the following ores contains maximum percentage of uranium ? |
| A. | Carnotite |
| B. | Thorium. |
| C. | Rescolite |
| D. | Pitchblende |
| Answer» E. | |
| 1813. |
Uranium ore is currently mined & concentrated at |
| A. | Jadugoda |
| B. | Ghatsila |
| C. | Khetri |
| D. | Alwaye |
| Answer» B. Ghatsila | |
| 1814. |
Nuclides having the same atomic numbers are termed as |
| A. | isotopes |
| B. | isomers |
| C. | isotones |
| D. | isobars |
| Answer» C. isotones | |
| 1815. |
The half life period of a radioactive element depends on its |
| A. | temperature |
| B. | pressure |
| C. | amount |
| D. | none of these |
| Answer» E. | |
| 1816. |
__________ have the same mass number, but different nuclear charge. |
| A. | Isotopes |
| B. | Isobars |
| C. | Isotones |
| D. | none of these |
| Answer» C. Isotones | |
| 1817. |
The most commonly used nuclear fuel in boiling water reactor is |
| A. | enriched uranium |
| B. | natural uranium |
| C. | plutonium |
| D. | monazite sand |
| Answer» B. natural uranium | |
| 1818. |
The function of moderators in nuclear reactor is to |
| A. | slow down the secondary neutrons. |
| B. | absorb the secondary neutrons. |
| C. | control the chain reaction. |
| D. | none of these. |
| Answer» B. absorb the secondary neutrons. | |
| 1819. |
Thermal shield is used in high powered nuclear reactors to |
| A. | protect the walls of the reactor from radiation damage. |
| B. | absorb the fast neutrons. |
| C. | slow down the secondary neutrons. |
| D. | protect the fuel element from coming in contact with the coolant. |
| Answer» B. absorb the fast neutrons. | |
| 1820. |
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then |
| A. | 3/4th of it will disintegrate in two months. |
| B. | it will completely disintegrate in two months. |
| C. | it will completely disintegrate in four months. |
| D. | l/8th of it will remain intact at the end of four months. |
| Answer» C. it will completely disintegrate in four months. | |
| 1821. |
Graphite is used in nuclear reactor as |
| A. | insulation lining of the reactor. |
| B. | fuel. |
| C. | lubricant. |
| D. | retarder of neutron velocity. |
| Answer» E. | |
| 1822. |
Which is a fertile nuclear fuel ? |
| A. | U-233 |
| B. | U-235 |
| C. | Pu-239 |
| D. | Th-232 |
| Answer» E. | |
| 1823. |
The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is |
| A. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/427-493-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/427-493-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/427-493-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/427-493-4.png"> |
| Answer» E. | |
| 1824. |
The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise. |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | decreases linearly |
| Answer» B. decreases | |
| 1825. |
Co-efficient of Performance (COP) of a refrigerator is the ratio of the |
| A. | work required to refrigeration obtained. |
| B. | refrigeration obtained to the work required. |
| C. | lower to higher temperature. |
| D. | higher to lower temperature. |
| Answer» C. lower to higher temperature. | |
| 1826. |
A solid metallic block weighing 5 kg has an initial temperature of 500 C. 40 kg of water initially at 25 C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1 , K-1 is |
| A. | -1.87 |
| B. | 0 |
| C. | 1.26 |
| D. | 3.91 |
| Answer» C. 1.26 | |
| 1827. |
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 |
| Answer» C. intensive properties | |
| 1828. |
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 | |
| 1829. |
When a gas in a vessel expands, its internal energy decreases. The process involved is |
| A. | reversible |
| B. | irreversible |
| C. | isothermal |
| D. | adiabatic |
| Answer» B. irreversible | |
| 1830. |
A system is said to be isopiestic, if there is no __________ change. |
| A. | temperature |
| B. | pressure |
| C. | volume |
| D. | none of these |
| Answer» C. volume | |
| 1831. |
In a turbine, the fluid expands almost |
| A. | isothermally |
| B. | isobarically |
| C. | adiabatically |
| D. | none of these |
| Answer» D. none of these | |
| 1832. |
The unity of Planck's constant 'h' in the equation, E = hv is |
| A. | J/s |
| B. | J.S |
| C. | J/kmol |
| D. | kmol/J |
| Answer» C. J/kmol | |
| 1833. |
Specific/molar Gibbs free energy for a pure substance does not change during |
| A. | sublimation |
| B. | vaporisation |
| C. | melting |
| D. | either (a), (b) or (c) |
| Answer» E. | |
| 1834. |
is the mathematical expression for |
| A. | <i>C<sub>V</sub></i> |
| B. | enthalpy change |
| C. | free energy change |
| D. | none of these |
| Answer» E. | |
| 1835. |
The activity of an ideal gas is numerically __________ its pressure. |
| A. | more than |
| B. | less than |
| C. | equal to |
| D. | data insufficient, can't be predicted |
| Answer» D. data insufficient, can't be predicted | |
| 1836. |
Which of the following diagrams does not represent an Otto cycle ? |
| A. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/424-460-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/424-460-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/424-460-3.png"> |
| D. | none of these |
| Answer» D. none of these | |
| 1837. |
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. |
| Answer» B. same COP. | |
| 1838. |
Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be |
| A. | 580 |
| B. | 640 |
| C. | 1160 |
| D. | data insufficient; can't be computed |
| Answer» D. data insufficient; can't be computed | |
| 1839. |
Specific heat of a gas for a reversible adiabatic process is |
| A. | negative |
| B. | zero |
| C. | infinity |
| D. | none of these |
| Answer» C. infinity | |
| 1840. |
The thermodynamic law, PVy = constant, is not applicable in case of |
| A. | ideal compression of air. |
| B. | free expansion of an ideal gas. |
| C. | adiabatic expansion of steam in a turbine. |
| D. | adiabatic compression of a perfect gas. |
| Answer» C. adiabatic expansion of steam in a turbine. | |
| 1841. |
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. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/420-415-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/420-415-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/420-415-3.png"> |
| D. | none of these |
| Answer» B. <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/420-415-2.png"> | |
| 1842. |
Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is |
| A. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/397-99-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/397-99-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/391-10-4.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/391-10-3.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/397-99-2.png"> | |
| 1843. |
Isentropic process means a constant __________ process. |
| A. | enthalpy |
| B. | pressure |
| C. | entropy . |
| D. | none of these |
| Answer» D. none of these | |
| 1844. |
The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are |
| A. | zero |
| B. | one |
| C. | two |
| D. | three |
| Answer» C. two | |
| 1845. |
Any substance above its critical temperature exists as |
| A. | saturated vapour |
| B. | solid |
| C. | gas |
| D. | liquid |
| Answer» D. liquid | |
| 1846. |
Which of the following decreases with increase in pressure ? |
| A. | Melting point of ice |
| B. | Melting point of wax |
| C. | Boiling point of liquids |
| D. | none of these |
| Answer» B. Melting point of wax | |
| 1847. |
Entropy change of mixing two liquid substances depends upon the |
| A. | molar concentration |
| B. | quantity (i.e. number of moles) |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1848. |
The four properties of a system viz. P, V, T, S are related by __________ equation. |
| A. | Gibbs-Duhem |
| B. | Gibbs-Helmholtz |
| C. | Maxwell's |
| D. | none of these |
| Answer» D. none of these | |
| 1849. |
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 | |
| 1850. |
The number of degree of freedom for an azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is |
| A. | 3 |
| B. | 1 |
| C. | 2 |
| D. | 0 |
| Answer» C. 2 | |