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MCQOPTIONS
This section includes 1092 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
According to which law, all perfect gases change in volume by 1/273th of their original volume at 0°C for every 1°C change in temperature when pressure remains constant |
| A. | Joule's law |
| B. | Boyle's law |
| C. | Gay Lussac’s law |
| D. | Charles' law |
| Answer» E. | |
| 452. |
In an isothermal process, the internal energy of gas molecules |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | May increase/decrease depending on the properties of gas |
| Answer» D. May increase/decrease depending on the properties of gas | |
| 453. |
The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called |
| A. | Specific heat at constant volume |
| B. | Specific heat at constant pressure |
| C. | kilo-Joule |
| D. | None of these |
| Answer» D. None of these | |
| 454. |
One kg of carbon monoxide requires 4/7 kg of oxygen and produces |
| A. | 11/3 kg of carbon dioxide gas |
| B. | 7/3 kg of carbon monoxide gas |
| C. | 11/7 kg of carbon dioxide gas |
| D. | 8/3 kg of carbon monoxide gas |
| Answer» D. 8/3 kg of carbon monoxide gas | |
| 455. |
One kg of hydrogen requires 8 kg of oxygen and produces |
| A. | 1 kg of water |
| B. | 7 kg of water |
| C. | 8 kg of water |
| D. | 9 kg of water |
| Answer» E. | |
| 456. |
The efficiency of Carnot cycle depends upon |
| A. | Temperature limits |
| B. | Volume compression ratio |
| C. | Cut-off ratio and compression ratio |
| D. | Pressure ratio |
| Answer» B. Volume compression ratio | |
| 457. |
The work ratio of simple gas turbine cycle depends upon |
| A. | Maximum cycle temperature |
| B. | Minimum cycle temperature |
| C. | Pressure ratio |
| D. | All of these |
| Answer» E. | |
| 458. |
The efficiency of Diesel cycle depends upon |
| A. | Pressure ratio |
| B. | Cut-off ratio and compression ratio |
| C. | Temperature limits |
| D. | Compression ratio |
| Answer» C. Temperature limits | |
| 459. |
Carnot cycle efficiency is maximum when |
| A. | Initial temperature is 0°K |
| B. | Final temperature is 0°K |
| C. | Difference between initial and final temperature is 0°K |
| D. | Final temperature is 0°C |
| Answer» C. Difference between initial and final temperature is 0°K | |
| 460. |
The efficiency of the Carnot cycle may be increased by |
| A. | Increasing the highest temperature |
| B. | Decreasing the highest temperature |
| C. | Increasing the lowest temperature |
| D. | Keeping the lowest temperature constant |
| Answer» B. Decreasing the highest temperature | |
| 461. |
No liquid can exist as liquid at |
| A. | 273°K |
| B. | Vacuum |
| C. | Zero pressure |
| D. | Centre of earth |
| Answer» D. Centre of earth | |
| 462. |
Which of the following cycles has maximum efficiency? |
| A. | Rankine |
| B. | Stirling |
| C. | Carnot |
| D. | Brayton |
| Answer» D. Brayton | |
| 463. |
Minimum work in compressor is possible when the value of adiabatic index ‘n’ is equal to |
| A. | 0.75 |
| B. | 1 |
| C. | 1.27 |
| D. | 1.35 |
| Answer» C. 1.27 | |
| 464. |
The polytropic index (n) is given by |
| A. | log (p1p2)/log (v1v2) |
| B. | log (p2/ p1)/log (v1/ v2) |
| C. | log (v1/ v2)/ log (p1/p2) |
| D. | log [(p1v1)/(p2v2)] |
| Answer» C. log (v1/ v2)/ log (p1/p2) | |
| 465. |
A diathermic wall is one which |
| A. | Prevents thermal interaction |
| B. | Permits thermal interaction |
| C. | Encourages thermal interaction |
| D. | Discourages thermal interaction |
| Answer» C. Encourages thermal interaction | |
| 466. |
The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called |
| A. | Kilo Joule |
| B. | Specific heat at constant volume |
| C. | Specific heat at constant pressure |
| D. | None of these |
| Answer» C. Specific heat at constant pressure | |
| 467. |
Which of the following processes is irreversible process? |
| A. | Isothermal |
| B. | Adiabatic |
| C. | Throttling |
| D. | All of the above |
| Answer» D. All of the above | |
| 468. |
Compressed air coming out from a punctured football |
| A. | Becomes hotter |
| B. | Becomes cooler |
| C. | Remains at the same temperature |
| D. | May become hotter or cooler depending upon the humidity of the surrounding air |
| Answer» C. Remains at the same temperature | |
| 469. |
Carnot cycle has maximum efficiency for |
| A. | Reversible engine |
| B. | Irreversible engine |
| C. | Petrol engine |
| D. | Diesel engine |
| Answer» B. Irreversible engine | |
| 470. |
Which of the following quantities is not the property of the system? |
| A. | Pressure |
| B. | Temperature |
| C. | Specific volume |
| D. | Heat |
| Answer» E. | |
| 471. |
According to Avogadro's law |
| A. | The product of the gas constant and the molecular mass of an ideal gas is constant |
| B. | The sum of partial pressure of the mixture of two gases is sum of the two |
| C. | Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules |
| D. | All of the above |
| Answer» D. All of the above | |
| 472. |
According to Avogadro’s law |
| A. | The product of the gas constant and the molecular mass of an ideal gas is constant |
| B. | The sum of partial pressure of the mixture of two gases is sum of the two |
| C. | Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules |
| D. | All of the above |
| Answer» D. All of the above | |
| 473. |
Which of the following gas is mostly used in town for street and domestic lighting and heating? |
| A. | Mond gas |
| B. | Coal gas |
| C. | Producer gas |
| D. | Coke oven gas |
| Answer» C. Producer gas | |
| 474. |
Which of the following is the lightest and most volatile liquid fuel? |
| A. | Gasoline |
| B. | Kerosene |
| C. | Fuel oil |
| D. | None of these |
| Answer» B. Kerosene | |
| 475. |
According to kinetic theory of gases, the absolute zero temperature is attained when |
| A. | Volume of the gas is zero |
| B. | Pressure of the gas is zero |
| C. | Kinetic energy of the molecules is zero |
| D. | Specific heat of gas is zero |
| Answer» D. Specific heat of gas is zero | |
| 476. |
The entropy of water at 0°C is assumed to be |
| A. | 0 |
| B. | -1 |
| C. | 1 |
| D. | 2 |
| Answer» B. -1 | |
| 477. |
Otto cycle is also known as |
| A. | Constant pressure cycle |
| B. | Constant volume cycle |
| C. | Constant temperature cycle |
| D. | Constant temperature and pressure cycle |
| Answer» C. Constant temperature cycle | |
| 478. |
Total heat of a substance is also known as |
| A. | Internal energy |
| B. | Entropy |
| C. | Thermal capacity |
| D. | Enthalpy |
| Answer» E. | |
| 479. |
Kinetic theory of gases assumes that the collisions between the molecules are |
| A. | Perfectly elastic |
| B. | Perfectly inelastic |
| C. | Partly elastic |
| D. | Partly inelastic |
| Answer» B. Perfectly inelastic | |
| 480. |
When the gas is heated at constant volume, the heat supplied |
| A. | Increases the internal energy of the gas and increases the temperature of the gas |
| B. | Does some external work during expansion |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» B. Does some external work during expansion | |
| 481. |
When the gas is heated at constant pressure, the heat supplied |
| A. | Increases the internal energy of the gas |
| B. | Increases the temperature of the gas |
| C. | Does some external work during expansion |
| D. | Both (B) and (C) |
| Answer» E. | |
| 482. |
The processes occurring in open system which permit the transfer of mass to and from the system, are known as |
| A. | Flow processes |
| B. | Non-flow processes |
| C. | Adiabatic processes |
| D. | None of these |
| Answer» B. Non-flow processes | |
| 483. |
The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv). |
| A. | Less than |
| B. | Equal to |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 484. |
In a reversible adiabatic process, the ratio of T1/T2 is equal to |
| A. | (p2/p1)γ - 1/ γ |
| B. | (p1/p2)γ - 1/ γ |
| C. | (v2/v1)γ - 1/ γ |
| D. | (v1/v2)γ - 1/ γ |
| Answer» C. (v2/v1)γ - 1/ γ | |
| 485. |
When a gas is heated at constant volume |
| A. | Its temperature will increase |
| B. | Its pressure will increase |
| C. | Both temperature and pressure will increase |
| D. | Neither temperature nor pressure will increase |
| Answer» D. Neither temperature nor pressure will increase | |
| 486. |
The __________ is obtained when carbonization of coal is carried out at 500° to 700° C. |
| A. | Soft coal |
| B. | Hard coal |
| C. | Pulverized coal |
| D. | Bituminous coal |
| Answer» B. Hard coal | |
| 487. |
The increase in entropy of a system represents |
| A. | Increase in availability of energy |
| B. | Increase in temperature |
| C. | Decrease in pressure |
| D. | Degradation of energy |
| Answer» E. | |
| 488. |
Steam coal is a |
| A. | Pulverized coal |
| B. | Brown coal |
| C. | Coking bituminous coal |
| D. | Non-coking bituminous coal |
| Answer» E. | |
| 489. |
Work done in an adiabatic process between a given pair of end states depends on |
| A. | The end states only |
| B. | Particular adiabatic process |
| C. | The value of index ‘n’ |
| D. | The value of heat transferred |
| Answer» B. Particular adiabatic process | |
| 490. |
A heat exchange process in which the product of pressure and volume remains constant is known as |
| A. | Heat exchange process |
| B. | Throttling process |
| C. | Isentropic process |
| D. | Hyperbolic process |
| Answer» E. | |
| 491. |
One barometric pressure or 1 atmospheric pressure is equal to |
| A. | 1 kgf/cm² |
| B. | 1.033 kgf/cm² |
| C. | 0 kgf/cm² |
| D. | 1.0197 kgf/cm² |
| Answer» C. 0 kgf/cm² | |
| 492. |
Specific heat of air at constant pressure is equal to |
| A. | 0.17 |
| B. | 0.21 |
| C. | 0.24 |
| D. | 1.0 |
| Answer» D. 1.0 | |
| 493. |
Barometric pressure is equal to |
| A. | 760 mm Hg |
| B. | Zero mm Hg |
| C. | 735.6 mm Hg |
| D. | 1 mm Hg |
| Answer» B. Zero mm Hg | |
| 494. |
An isothermal process is governed by |
| A. | Gay-Lussac law |
| B. | Charles' law |
| C. | Boyle's law |
| D. | Avogadro's law |
| Answer» D. Avogadro's law | |
| 495. |
The hyperbolic process is governed by |
| A. | Avogadro's law |
| B. | Boyle's law |
| C. | Charles' law |
| D. | Gay-Lussac law |
| Answer» C. Charles' law | |
| 496. |
In an isothermal process |
| A. | There is no change in enthalpy |
| B. | There is no change in internal energy |
| C. | There is no change in temperature |
| D. | All of these |
| Answer» E. | |
| 497. |
The behavior of a perfect gas, undergoing any change in the variables which control physical properties, is governed by |
| A. | Boyle's law |
| B. | Gay-Lussac law |
| C. | Charles' law |
| D. | All of these |
| Answer» E. | |
| 498. |
A cycle consisting of _________ and two isothermal processes is known as Stirling cycle. |
| A. | Two isentropic |
| B. | One constant pressure, one constant volume |
| C. | Two constant volumes |
| D. | Two constant pressures |
| Answer» D. Two constant pressures | |
| 499. |
A cycle consisting of __________ and two isothermal processes is known as Stirling cycle. |
| A. | Two constant pressure |
| B. | Two constant volume |
| C. | Two isentropic |
| D. | One constant pressure, one constant volume |
| Answer» C. Two isentropic | |
| 500. |
Extensive property of a system is one whose value |
| A. | Depends on the mass of the system like volume |
| B. | Does not depend on the mass of the system, like temperature, pressure, etc. |
| C. | Is not dependent on the path followed but on the state |
| D. | Is dependent on the path followed and not on the state |
| Answer» B. Does not depend on the mass of the system, like temperature, pressure, etc. | |