MCQOPTIONS
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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.
| 701. |
An open cycle gas turbine works on%! |
| A. | Otto cycle |
| B. | Carnot cycle |
| C. | Joule's cycle |
| D. | Stirling cycle |
| Answer» D. Stirling cycle | |
| 702. |
One molecule of oxygen consists of __________ atoms of oxygen.%! |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» B. 4 | |
| 703. |
When cut-off ratio is ________; the efficiency of Diesel cycle approaches to Otto cycle efficiency%! |
| A. | 1/4 |
| B. | Zero |
| C. | 1/5 |
| D. | 2 |
| Answer» C. 1/5 | |
| 704. |
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 | |
| 705. |
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 | |
| 706. |
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 | |
| 707. |
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. | |
| 708. |
*$_According to Avogadro's law? |
| A. | The product of the gas constant and the molecular mass of an ideal gas is constant |
| B. | The sum of partial pressure of the mixture of two gases is sum of the two |
| C. | Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules |
| D. | All of the above |
| Answer» D. All of the above | |
| 709. |
*$_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 | |
| 710. |
*$_The processes occurring in open system which permit the transfer of mass to and from the system, are known as? |
| A. | Flow processes |
| B. | Non-flow processes |
| C. | Adiabatic processes |
| D. | None of these |
| Answer» B. Non-flow processes | |
| 711. |
*$_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 | |
| 712. |
*$_The increase in entropy of a system represents? |
| A. | Increase in availability of energy |
| B. | Increase in temperature |
| C. | Decrease in pressure |
| D. | Degradation of energy |
| Answer» E. | |
| 713. |
*$_When cut-off ratio is ________; the efficiency of Diesel cycle approaches to Otto cycle efficiency? |
| A. | 1/4 |
| B. | Zero |
| C. | 1/5 |
| D. | 2 |
| Answer» C. 1/5 | |
| 714. |
*$_Change in enthalpy of a system is the heat supplied at? |
| A. | Constant pressure |
| B. | Constant temperature |
| C. | Constant volume |
| D. | Constant entropy |
| Answer» B. Constant temperature | |
| 715. |
*$_One molecule of oxygen consists of __________ atoms of oxygen.? |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» B. 4 | |
| 716. |
*$_According to kinetic theory of gases, the absolute zero temperature is attained when? |
| A. | Volume of the gas is zero |
| B. | Pressure of the gas is zero |
| C. | Kinetic energy of the molecules is zero |
| D. | Specific heat of gas is zero |
| Answer» D. Specific heat of gas is zero | |
| 717. |
*$_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. | |
| 718. |
*$_The unit of length in S.I. units is? |
| A. | Meter |
| B. | Centimeter |
| C. | Kilometer |
| D. | Millimeter |
| Answer» B. Centimeter | |
| 719. |
*$_The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is? |
| A. | 29.27 J/kmol °K |
| B. | 83.14 J/kmol °K |
| C. | 848 J/kmol °K |
| D. | 735 J/kmol °K |
| Answer» C. 848 J/kmol ¬¨‚àûK | |
| 720. |
*$_An open cycle gas turbine works on? |
| A. | Otto cycle |
| B. | Carnot cycle |
| C. | Joule's cycle |
| D. | Stirling cycle |
| Answer» D. Stirling cycle | |
| 721. |
*/*_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. | |
| 722. |
*/*_No liquid can exist as liquid at? |
| A. | 273°K |
| B. | Vacuum |
| C. | Zero pressure |
| D. | Centre of earth |
| Answer» D. Centre of earth | |
| 723. |
*/*_The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules.? |
| A. | 1 g |
| B. | 10 g |
| C. | 100 g |
| D. | 1000 g |
| Answer» E. | |
| 724. |
*/*_A tri-atomic molecule consists of __________ atoms.? |
| A. | Three |
| B. | One |
| C. | Two |
| D. | Four |
| Answer» B. One | |
| 725. |
*/*_The variables which control the physical properties of a perfect gas are? |
| A. | Pressure exerted by the gas |
| B. | Volume occupied by the gas |
| C. | Temperature of the gas |
| D. | All of these |
| Answer» E. | |
| 726. |
*/*_The gas constant (R) is equal to the? |
| A. | Sum of two specific heats |
| B. | Difference of two specific heats |
| C. | Product of two specific heats |
| D. | Ratio of two specific heats |
| Answer» C. Product of two specific heats | |
| 727. |
*/*_For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.? |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | None of these |
| Answer» C. Equal to | |
| 728. |
*/*_The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will? |
| A. | Increase |
| B. | Decrease |
| C. | Remain unchanged |
| D. | Increase/decrease depending on application |
| Answer» B. Decrease | |
| 729. |
*/*_The heating of gas at constant volume is governed by? |
| A. | Boyle's law |
| B. | Charles' law |
| C. | Gay-Lussac law |
| D. | Avogadro's law |
| Answer» D. Avogadro's law | |
| 730. |
*/*_Those substances which have so far not been resolved by any means into other substances of simpler form are called? |
| A. | Atoms |
| B. | Compounds |
| C. | Elements |
| D. | Molecules |
| Answer» D. Molecules | |
| 731. |
*/*_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 | |
| 732. |
*/*_According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as? |
| A. | Temperature |
| B. | Absolute temperature, if volume is kept constant |
| C. | Volume, if temperature is kept constant |
| D. | None of these |
| Answer» C. Volume, if temperature is kept constant | |
| 733. |
*/*_Which law states that the internal energy of a gas is a function of temperature?? |
| A. | Charles' law |
| B. | Joule's law |
| C. | Boyle's law |
| D. | There is no such law |
| Answer» C. Boyle's law | |
| 734. |
*/*_The energy of molecular motion appears as? |
| A. | Heat |
| B. | Potential energy |
| C. | Surface tension |
| D. | Friction |
| Answer» B. Potential energy | |
| 735. |
*/*_Which of the following is the correct statement?? |
| A. | For a given compression ratio, both Otto and Diesel cycles have the same efficiency |
| B. | For a given compression ratio, Otto cycle is more efficient than Diesel cycle |
| C. | For a given compression ratio, Diesel cycle is more efficient than Otto cycle |
| D. | The efficiency of Otto or Diesel cycle has nothing to do with compression ratio |
| Answer» C. For a given compression ratio, Diesel cycle is more efficient than Otto cycle | |
| 736. |
*/*_In a no flow reversible process for which p = (3V + 15) × 105 N/m², V changes from 1 m3 to 2 m3. The work done will be about? |
| A. | 100 × 10⁵ joules |
| B. | 1 × 10⁵ joules |
| C. | 10 × 10⁵ joules |
| D. | 10 × 10⁵ kilo joules |
| Answer» D. 10 ‚àö√≥ 10‚Äö√Ö¬µ kilo joules | |
| 737. |
*/*_If in the equation pvn = C, the value of n = ‚Äö√ √π, then the process is called? |
| A. | Constant volume process |
| B. | Adiabatic process |
| C. | Constant pressure process |
| D. | Isothermal process |
| Answer» B. Adiabatic process | |
| 738. |
*/*_The work ratio of a gas turbine plant is given by? |
| A. | (Net work output)/(Work-done by the turbine) |
| B. | (Net work output)/(Heat supplied) |
| C. | (Actual temperature drop)/(Isentropic temperature drop) |
| D. | (Isentropic increase in temperature)/(Actual increase in temperature) |
| Answer» B. (Net work output)/(Heat supplied) | |
| 739. |
*/*_Which of the following is correct?? |
| A. | Gauge pressure = Absolute pressure + Atmospheric pressure |
| B. | Absolute pressure = Gauge pressure + Atmospheric pressure |
| C. | Absolute pressure = Gauge pressure - Atmospheric pressure |
| D. | Atmospheric pressure = Absolute pressure + Gauge pressure |
| Answer» C. Absolute pressure = Gauge pressure - Atmospheric pressure | |
| 740. |
*/*_Which of the following laws is applicable for the behaviour of a perfect gas?? |
| A. | Boyle's law |
| B. | Charles ‘law |
| C. | Gay Lussac’s law |
| D. | All of the above |
| Answer» E. | |
| 741. |
*/*_When the expansion or compression takes place according to the law pvn = C, the process is known as? |
| A. | Isothermal process |
| B. | Adiabatic process |
| C. | Hyperbolic process |
| D. | Polytropic process |
| Answer» E. | |
| 742. |
*/*_A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called? |
| A. | Isothermal process |
| B. | Hyperbolic process |
| C. | Adiabatic process |
| D. | Polytropic process |
| Answer» C. Adiabatic process | |
| 743. |
*/*_If a system after undergoing a series of processes, returns to the initial state then? |
| A. | Process is thermodynamically in equilibrium |
| B. | Process is executed in closed system cycle |
| C. | Its entropy will change due to irreversibility |
| D. | Sum of heat and work transfer will be zero |
| Answer» E. | |
| 744. |
*/*_Zeroth law of thermodynamics? |
| A. | Deals with conversion of mass and energy |
| B. | Deals with reversibility and irreversibility of process |
| C. | States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other |
| D. | Deals with heat engines |
| Answer» D. Deals with heat engines | |
| 745. |
*/*_When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is? |
| A. | Coke |
| B. | Wood charcoal |
| C. | Bituminous coal |
| D. | Briquetted coal |
| Answer» C. Bituminous coal | |
| 746. |
*/*_One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.? |
| A. | 4/7 |
| B. | 11/4 |
| C. | 9/7 |
| D. | All of these |
| Answer» B. 11/4 | |
| 747. |
*/*_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. | |
| 748. |
*/*_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. | |
| 749. |
*/*_Isochoric process is one in which? |
| A. | Free expansion takes place |
| B. | Very little mechanical work is done by the system |
| C. | No mechanical work is done by the system |
| D. | All parameters remain constant |
| Answer» D. All parameters remain constant | |
| 750. |
*/*_The area under the temperature-entropy curve (T – s curve) of any thermodynamic process represents? |
| A. | Heat absorbed |
| B. | Heat rejected |
| C. | Either heat absorbed or heat rejected |
| D. | None of these |
| Answer» D. None of these | |