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.
| 751. |
*/*_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/cm¬¨‚⧠| |
| 752. |
*/*_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 | |
| 753. |
*/*_Molecular volume of any perfect gas at 600 × 103 N/m² and 27°C will be? |
| A. | 4.17 m3/kg mol |
| B. | 400 m3/kg mol |
| C. | 0.15 m3/kg mol |
| D. | 41.7 m3/kg mol |
| Answer» B. 400 m3/kg mol | |
| 754. |
*/*_The absolute zero temperature is taken as? |
| A. | 237°C |
| B. | -273°C |
| C. | -237°C |
| D. | 273°C |
| Answer» C. -237¬¨‚àûC | |
| 755. |
*/*_The process is adiabatic, if the value of n in the equation pvn = C, is? |
| A. | Zero |
| B. | One |
| C. | γ |
| D. | ‚Äö√ √π |
| Answer» D. ‚Äö√ √π | |
| 756. |
*/*_The atomic mass of sulphur is? |
| A. | 12 |
| B. | 14 |
| C. | 16 |
| D. | 32 |
| Answer» E. | |
| 757. |
*/*_In a steady flow process, the ratio of? |
| A. | Heat transfer is constant |
| B. | Work transfer is constant |
| C. | Mass flow at inlet and outlet is same |
| D. | All of these |
| Answer» E. | |
| 758. |
*/*_Which of the following statement is incorrect?? |
| A. | The liquid fuels have higher calorific value than solid fuels |
| B. | The solid fuels have higher calorific value than liquid fuels |
| C. | A good fuel should have low ignition point |
| D. | The liquid fuels consist of hydrocarbons |
| Answer» C. A good fuel should have low ignition point | |
| 759. |
*/*_Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as? |
| A. | Zeroth law of thermodynamics |
| B. | First law of thermodynamics |
| C. | Second law of thermodynamics |
| D. | Kinetic theory of gases |
| Answer» C. Second law of thermodynamics | |
| 760. |
*/*_When gas is heated at constant pressure, the heat supplied is utilized in? |
| A. | Increasing the internal energy of gas |
| B. | Doing some external work |
| C. | Increasing the internal energy of gas and also for doing some external work |
| D. | None of the above |
| Answer» D. None of the above | |
| 761. |
*/*_Kerosene is distilled at? |
| A. | 65° to 220°C |
| B. | 220° to 345°C |
| C. | 345° to 470°C |
| D. | 470° to 550°C |
| Answer» C. 345¬¨‚àû to 470¬¨‚àûC | |
| 762. |
*/*_The efficiency of Diesel cycle approaches to Otto cycle efficiency when? |
| A. | Cut-off is decreased |
| B. | Cut-off is constant |
| C. | Cut-off is increased |
| D. | Cut-off is zero |
| Answer» C. Cut-off is increased | |
| 763. |
*/*_The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)? |
| A. | (T1/T2) - 1 |
| B. | 1 - (T1/T2) |
| C. | 1 - (T2/T1) |
| D. | 1 + (T2/T1) |
| Answer» D. 1 + (T2/T1) | |
| 764. |
*/*_When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.? |
| A. | Zero |
| B. | 1/5 |
| C. | 4/5 |
| D. | 1 |
| Answer» B. 1/5 | |
| 765. |
*/*_When a gas is heated at constant pressure? |
| A. | Its temperature will increase |
| B. | Its volume will increase |
| C. | Both temperature and volume will increase |
| D. | Neither temperature not volume will increase |
| Answer» D. Neither temperature not volume will increase | |
| 766. |
*/*_For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be? |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | Infinity |
| Answer» B. Minimum | |
| 767. |
*/*_The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is? |
| A. | 29.27 kgfm/mol °K |
| B. | 8314 kgfm/mol °K |
| C. | 848 kgfm/mol °K |
| D. | 427 kgfm/mol °K |
| Answer» D. 427 kgfm/mol ¬¨‚àûK | |
| 768. |
*/*_When a gas is heated, change takes place in? |
| A. | Temperature |
| B. | Pressure |
| C. | Volume |
| D. | All of these |
| Answer» E. | |
| 769. |
*/*_On weight basis, air contains following parts of oxygen? |
| A. | 21 |
| B. | 23 |
| C. | 25 |
| D. | 73 |
| Answer» C. 25 | |
| 770. |
*/*_The fuel mostly used in cement industry and in metallurgical processes is? |
| A. | Wood charcoal |
| B. | Bituminous coke |
| C. | Pulverized coal |
| D. | Coke |
| Answer» D. Coke | |
| 771. |
*/*_The oxygen atom is ________ times heavier than the hydrogen atom.? |
| A. | 2 |
| B. | 8 |
| C. | 16 |
| D. | 32 |
| Answer» D. 32 | |
| 772. |
*/*_One kg of carbon produces ________ kg of carbon dioxide.? |
| A. | 3/7 |
| B. | 11/7 |
| C. | 11/3 |
| D. | 4/11 |
| Answer» D. 4/11 | |
| 773. |
*/*_The condition for the reversibility of a cycle is? |
| A. | The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process |
| B. | All the processes, taking place in the cycle of operation, must be extremely slow |
| C. | The working parts of the engine must be friction free |
| D. | All of the above |
| Answer» E. | |
| 774. |
*/*_The universal gas constant (or molar constant) of a gas is the product of? |
| A. | Molecular mass of the gas and the gas constant |
| B. | Atomic mass of the gas and the gas constant |
| C. | Molecular mass of the gas and the specific heat at constant pressure |
| D. | Molecular mass of the gas and the specific heat at constant volume |
| Answer» B. Atomic mass of the gas and the gas constant | |
| 775. |
*/*_An open system is one in which? |
| A. | Mass does not cross boundaries of the system, though energy may do so |
| B. | Neither mass nor energy crosses the boundaries of the system |
| C. | Both energy and mass cross the boundaries of the system |
| D. | Mass crosses the boundary but not the energy |
| Answer» D. Mass crosses the boundary but not the energy | |
| 776. |
*/*_The state of a substance whose evaporation from its liquid state is complete, is known as? |
| A. | Perfect gas |
| B. | Vapour |
| C. | Steam |
| D. | Air |
| Answer» B. Vapour | |
| 777. |
*/*_Which of the following is the correct statement of the second law of thermodynamics?? |
| A. | There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy |
| B. | It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source |
| C. | It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work |
| D. | All of the above |
| Answer» E. | |
| 778. |
*/*_According to First law of thermodynamics,? |
| A. | Total internal energy of a system during a process remains constant |
| B. | Total energy of a system remains constant |
| C. | Work-done by a system is equal to the heat transferred by the system |
| D. | Internal energy, enthalpy and entropy during a process remain constant |
| Answer» C. Work-done by a system is equal to the heat transferred by the system | |
| 779. |
*/*_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 | |
| 780. |
*/*_The change of entropy, when heat is absorbed by the gas, is? |
| A. | Positive |
| B. | Negative |
| C. | Positive or negative |
| D. | None of these |
| Answer» B. Negative | |
| 781. |
*/*_The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by? |
| A. | Kelvin |
| B. | Joule |
| C. | Clausis |
| D. | Gay-Lussac |
| Answer» D. Gay-Lussac | |
| 782. |
*/*_The efficiency of a Carnot engine depends on? |
| A. | Working substance |
| B. | Design of engine |
| C. | Size of engine |
| D. | Temperatures of source and sink |
| Answer» E. | |
| 783. |
*/*_The temperature at which the volume of a gas becomes zero is called? |
| A. | Absolute scale of temperature |
| B. | Absolute zero temperature |
| C. | Absolute temperature |
| D. | None of these |
| Answer» C. Absolute temperature | |
| 784. |
*/*_Calorie is a measure of? |
| A. | Specific heat |
| B. | Quantity of heat |
| C. | Thermal capacity |
| D. | Entropy |
| Answer» C. Thermal capacity | |
| 785. |
*/*_The value of cp/cv for air is? |
| A. | 1 |
| B. | 1.4 |
| C. | 1.45 |
| D. | 2.3 |
| Answer» C. 1.45 | |
| 786. |
*/*_The specific heat of water is? |
| A. | 2.512 |
| B. | 1.817 |
| C. | 4.187 |
| D. | None of these |
| Answer» D. None of these | |
| 787. |
*/*_A molecule consisting of one atom is known as? |
| A. | Mono-atomic |
| B. | Di-atomic |
| C. | Tri-atomic |
| D. | Poly-atomic |
| Answer» B. Di-atomic | |
| 788. |
*/*_The entropy of water at 0°C is assumed to be? |
| A. | 0 |
| B. | -1 |
| C. | 1 |
| D. | 2 |
| Answer» B. -1 | |
| 789. |
*/*_The absolute zero pressure will be? |
| A. | When molecular momentum of the system becomes zero |
| B. | At sea level |
| C. | At the temperature of - 273 K |
| D. | At the center of the earth |
| Answer» B. At sea level | |
| 790. |
*/*_The unit of pressure in S.I. units is? |
| A. | kg/cm² |
| B. | mm of water column |
| C. | Pascal |
| D. | Dyne per square cm |
| Answer» D. Dyne per square cm | |
| 791. |
*/*_The unit of power in S.I. units is? |
| A. | Newton |
| B. | Pascal |
| C. | Erg |
| D. | Watt |
| Answer» E. | |
| 792. |
*/*_The mass of flue gas per kg of fuel is the ratio of the? |
| A. | Mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel |
| B. | Mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas |
| C. | Mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel |
| D. | Mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas |
| Answer» D. Mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas | |
| 793. |
*/*_A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is? |
| A. | 54°C |
| B. | 327°C |
| C. | 108°C |
| D. | 654°C |
| Answer» C. 108¬¨‚àûC | |
| 794. |
*/*_Characteristic gas constant of a gas is equal to? |
| A. | Cp /Cv |
| B. | Cv /Cp |
| C. | Cp - Cv |
| D. | Cp + Cv |
| Answer» D. Cp + Cv | |
| 795. |
*/*_The atomic mass of nitrogen is __________ oxygen.? |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 796. |
*/*_The efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle.? |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | None of these |
| Answer» B. Less than | |
| 797. |
*/*_The sum of internal energy (U) and the product of pressure and volume (p.v) is known as? |
| A. | Work done |
| B. | Entropy |
| C. | Power |
| D. | Enthalpy |
| Answer» E. | |
| 798. |
%_Steam coal is a_% |
| A. | Pulverized coal |
| B. | Brown coal |
| C. | Coking bituminous coal |
| D. | Non-coking bituminous coal |
| Answer» E. | |
| 799. |
_ According to Avogadro’s law$? |
| A. | The product of the gas constant and the molecular mass of an ideal gas is constant |
| B. | The sum of partial pressure of the mixture of two gases is sum of the two |
| C. | Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules |
| D. | All of the above |
| Answer» D. All of the above | |
| 800. |
_ Carnot cycle has maximum efficiency for$? |
| A. | Reversible engine |
| B. | Irreversible engine |
| C. | Petrol engine |
| D. | Diesel engine |
| Answer» B. Irreversible engine | |