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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.
| 1001. |
All perfect gases change in volume by 1/273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called$ |
| A. | Boyle's law |
| B. | Charles' law |
| C. | Gay-Lussac law |
| D. | Joule's law |
| Answer» C. Gay-Lussac law | |
| 1002. |
Mond gas is obtained by |
| A. | Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast |
| B. | Carbonisation of bituminous coal |
| C. | Passing steam over incandescent coke |
| D. | Passing air and a large amount of steam over waste coal at about 650°C |
| Answer» E. | |
| 1003. |
Which of the following is the property of a system? |
| A. | Pressure and temperature |
| B. | Volume and density |
| C. | Enthalpy and entropy |
| D. | All of the above |
| Answer» E. | |
| 1004. |
The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion) |
| A. | v1/v2 |
| B. | v2/v1 |
| C. | (v1 + v2)/v1 |
| D. | (v1 + v2)/v2 |
| Answer» C. (v1 + v2)/v1 | |
| 1005. |
The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature. |
| A. | Boyle's law |
| B. | Charle's law |
| C. | Gay-Lussac law |
| D. | Joule's law |
| Answer» E. | |
| 1006. |
According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature. |
| A. | Remains constant |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» C. Decreases | |
| 1007. |
Reversed joule cycle is called |
| A. | Carnot cycle |
| B. | Rankine cycle |
| C. | Brayton cycle |
| D. | Bell Coleman cycle |
| Answer» D. Bell Coleman cycle | |
| 1008. |
The same volume of all gases would represent their |
| A. | Densities |
| B. | Specific weights |
| C. | Molecular weights |
| D. | Gas characteristic constants |
| Answer» D. Gas characteristic constants | |
| 1009. |
Otto cycle consists of |
| A. | Two constant volume and two isentropic processes |
| B. | Two constant pressure and two isentropic processes |
| C. | Two constant volume and two isothermal processes |
| D. | One constant pressure, one constant volume and two isentropic processes |
| Answer» B. Two constant pressure and two isentropic processes | |
| 1010. |
Which of the following processes are thermodynamically reversible? |
| A. | Throttling |
| B. | Free expansion |
| C. | Constant volume and constant pressure |
| D. | Isothermal and adiabatic |
| Answer» E. | |
| 1011. |
The natural petroleum may be separated into |
| A. | Petrol |
| B. | Kerosene |
| C. | Fuel oil |
| D. | Lubricating oil |
| Answer» E. | |
| 1012. |
A gas is compressed in a cylinder by a movable piston to a volume one half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be |
| A. | 300 Nm |
| B. | 300,000 Nm |
| C. | 30 Nm |
| D. | 3000 Nm |
| Answer» C. 30 Nm | |
| 1013. |
1 kgf/cm² is equal to$ |
| A. | 760 mm Hg |
| B. | Zero mm Hg |
| C. | 735.6 mm Hg |
| D. | 1 mm Hg |
| Answer» D. 1 mm Hg | |
| 1014. |
During throttling process |
| A. | Heat exchange does not take place |
| B. | No work is done by expanding steam |
| C. | There is no change of internal energy of steam |
| D. | All of the above |
| Answer» E. | |
| 1015. |
If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly |
| A. | Temperature |
| B. | Enthalpy |
| C. | Internal energy |
| D. | Entropy |
| Answer» E. | |
| 1016. |
Absolute zero pressure will occur |
| A. | At sea level |
| B. | When molecular momentum of the system becomes zero |
| C. | Under vacuum conditions |
| D. | At a temperature of 273°K |
| Answer» C. Under vacuum conditions | |
| 1017. |
In a Carnot cycle, heat is transferred at |
| A. | Constant pressure |
| B. | Constant volume |
| C. | Constant temperature |
| D. | Constant enthalpy |
| Answer» D. Constant enthalpy | |
| 1018. |
In an ideal gas turbine plant, it is assumed that the compression and expansion processes are |
| A. | Isothermal |
| B. | Isentropic |
| C. | Polytropic |
| D. | None of these |
| Answer» C. Polytropic | |
| 1019. |
For a perfect gas, according to Boyle's law (where p = Absolute pressure, v = Volume, and T = Absolute temperature) |
| A. | p v = constant, if T is kept constant |
| B. | v/T = constant, if p is kept constant |
| C. | p/T = constant, if v is kept constant |
| D. | T/p = constant, if v is kept constant |
| Answer» B. v/T = constant, if p is kept constant | |
| 1020. |
The efficiency of Diesel cycle increases with |
| A. | Increase in cut-off |
| B. | Constant cut-off |
| C. | Decrease in cut-off |
| D. | None of these |
| Answer» D. None of these | |
| 1021. |
According to Kelvin-Planck's statement of second law of thermodynamics, |
| A. | It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work |
| B. | It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work |
| C. | It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body |
| D. | None of the above |
| Answer» B. It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work | |
| 1022. |
If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be$ |
| A. | 80°C |
| B. | 0°C |
| C. | 40°C |
| D. | 20°C |
| Answer» C. 40¬¨‚àûC | |
| 1023. |
The ultimate analysis of coal consists of the determination of the percentage of |
| A. | Carbon |
| B. | Hydrogen and nitrogen |
| C. | Sulphur and ash |
| D. | All of these |
| Answer» E. | |
| 1024. |
The efficiency and work ratio of a simple gas turbine cycle are |
| A. | Very low |
| B. | Low |
| C. | High |
| D. | Very high |
| Answer» B. Low | |
| 1025. |
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 | |
| 1026. |
Which of the following is not the intensive property? |
| A. | Pressure |
| B. | Temperature |
| C. | Density |
| D. | Heat |
| Answer» E. | |
| 1027. |
The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as |
| A. | Dual combustion cycle |
| B. | Diesel cycle |
| C. | Atkinson cycle |
| D. | Rankine cycle |
| Answer» D. Rankine cycle | |
| 1028. |
Which of the following has the highest calorific value? |
| A. | Anthracite coal |
| B. | Bituminous coal |
| C. | Peat |
| D. | Lignite |
| Answer» B. Bituminous coal | |
| 1029. |
A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as |
| A. | Irreversible cycle |
| B. | Thermodynamic cycle |
| C. | Reversible cycle |
| D. | None of these |
| Answer» C. Reversible cycle | |
| 1030. |
For the same maximum pressure and temperature, |
| A. | Otto cycle is more efficient than Diesel cycle |
| B. | Diesel cycle is more efficient than Otto cycle |
| C. | Dual cycle is more efficient than Otto and Diesel cycles |
| D. | Dual cycle is less efficient than Otto and Diesel cycles |
| Answer» C. Dual cycle is more efficient than Otto and Diesel cycles | |
| 1031. |
The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is |
| A. | 23.97 bar |
| B. | 25 bar |
| C. | 26.03 bar |
| D. | 34.81 bar |
| Answer» D. 34.81 bar | |
| 1032. |
Energy can neither be created nor destroyed but can be converted from one form to other is inferred from |
| A. | Zeroth low of thermodynamic |
| B. | First law of thermodynamics |
| C. | Second law to thermodynamics |
| D. | Basic law of thermodynamics |
| Answer» C. Second law to thermodynamics | |
| 1033. |
The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to |
| A. | 0 |
| B. | 1 |
| C. | γ |
| D. | ‚Äö√ √π |
| Answer» C. ≈í‚â• | |
| 1034. |
The unit of energy in S.I. units is |
| A. | watt |
| B. | Joule |
| C. | joule/s |
| D. | joule/m |
| Answer» C. joule/s | |
| 1035. |
The fuel mostly used in steam boilers is |
| A. | Brown coal |
| B. | Peat |
| C. | Coking bituminous coal |
| D. | Non-coking bituminous coal |
| Answer» E. | |
| 1036. |
In a free expansion process, |
| A. | W1 - 2 = 0 |
| B. | Q1 - 2 = 0 |
| C. | dU = 0 |
| D. | All of these |
| Answer» E. | |
| 1037. |
An adiabatic wall is one which |
| A. | Prevents thermal interaction |
| B. | Permits thermal interaction |
| C. | Encourages thermal interaction |
| D. | Discourages thermal interaction |
| Answer» B. Permits thermal interaction | |
| 1038. |
According to Avogadro's Hypothesis |
| A. | The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature |
| B. | The sum of partial pressure of mixture of two gases is sum of the two |
| C. | Product of the gas constant and the molecular weight of an ideal gas is constant |
| D. | Gases have two values of specific heat |
| Answer» B. The sum of partial pressure of mixture of two gases is sum of the two | |
| 1039. |
Diesel cycle consists of __________ processes. |
| A. | Two constant volume and two isentropic |
| B. | Two constant pressure and two isentropic |
| C. | Two constant volume and two isothermal |
| D. | One constant pressure, one constant volume and two isentropic |
| Answer» E. | |
| 1040. |
Kelvin-Planck’s law deals with# |
| A. | Conservation of work |
| B. | Conservation of heat |
| C. | Conversion of work into heat |
| D. | Conversion of heat into work |
| Answer» E. | |
| 1041. |
One watt is equal to |
| A. | 1 Nm/s |
| B. | 1 N/m |
| C. | 1 Nm/hr |
| D. | 1 kNm/hr |
| Answer» B. 1 N/m | |
| 1042. |
According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible. |
| A. | First kind |
| B. | Second kind |
| C. | Third kind |
| D. | None of these |
| Answer» C. Third kind | |
| 1043. |
A cycle consisting of two constant pressure and two isentropic processes is known as |
| A. | Carnot cycle |
| B. | Stirling cycle |
| C. | Otto cycle |
| D. | None of these |
| Answer» E. | |
| 1044. |
Which of the following gas has a minimum molecular mass? |
| A. | Nitrogen |
| B. | Hydrogen |
| C. | Methane |
| D. | Oxygen |
| Answer» C. Methane | |
| 1045. |
If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called |
| A. | Free expansion |
| B. | Hyperbolic expansion |
| C. | Adiabatic expansion |
| D. | Parabolic expansion |
| Answer» B. Hyperbolic expansion | |
| 1046. |
The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of |
| A. | 0.224 liters |
| B. | 2.24 liters |
| C. | 22.4 liters |
| D. | 224 liters |
| Answer» D. 224 liters | |
| 1047. |
The condition of perfect vacuum, i.e., absolute zero pressure can be attained at |
| A. | A temperature of 273.16°C |
| B. | A temperature of 0°C |
| C. | A temperature of 273 °K |
| D. | A negative pressure and 0°C temperature |
| Answer» B. A temperature of 0¬¨‚àûC | |
| 1048. |
The term N.T.P. stands for |
| A. | Nominal temperature and pressure |
| B. | Natural temperature and pressure |
| C. | Normal temperature and pressure |
| D. | Normal thermodynamic practice |
| Answer» D. Normal thermodynamic practice | |
| 1049. |
A perpetual motion machine is |
| A. | A thermodynamic machine |
| B. | A non-thermodynamic machine |
| C. | A hypothetical machine |
| D. | A hypothetical machine whose operation would violate the laws of thermodynamics |
| Answer» E. | |
| 1050. |
The door of a running refrigerator inside a room was left open. Which of the following statements is correct? |
| A. | The room will be cooled to the temperature inside the refrigerator |
| B. | The room will be cooled very slightly |
| C. | The room will be gradually warmed up |
| D. | The temperature of the air in room will remain unaffected |
| Answer» D. The temperature of the air in room will remain unaffected | |