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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.
| 951. |
Which of the following is the lightest and most volatile liquid fuel?$? |
| A. | Gasoline |
| B. | Kerosene |
| C. | Fuel oil |
| D. | None of these |
| Answer» B. Kerosene | |
| 952. |
To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is$? |
| A. | Divided by its molecular weight |
| B. | Multiplied by its molecular weight |
| C. | Multiplied by its density |
| D. | Multiplied by its specific weight |
| Answer» C. Multiplied by its density | |
| 953. |
Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure$? |
| A. | Enthalpy |
| B. | Volume |
| C. | Mass |
| D. | Entropy |
| Answer» C. Mass | |
| 954. |
A heat exchange process in which the product of pressure and volume remains constant is known as$? |
| A. | Heat exchange process |
| B. | Throttling process |
| C. | Isentropic process |
| D. | Hyperbolic process |
| Answer» E. | |
| 955. |
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 | |
| 956. |
Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure? |
| A. | Enthalpy |
| B. | Volume |
| C. | Mass |
| D. | Entropy |
| Answer» C. Mass | |
| 957. |
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 | |
| 958. |
To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is? |
| A. | Divided by its molecular weight |
| B. | Multiplied by its molecular weight |
| C. | Multiplied by its density |
| D. | Multiplied by its specific weight |
| Answer» C. Multiplied by its density | |
| 959. |
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. | |
| 960. |
Which of the following gas has the highest calorific value?? |
| A. | Coal gas |
| B. | Producer gas |
| C. | Mond gas |
| D. | Blast furnace gas |
| Answer» B. Producer gas | |
| 961. |
The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as? |
| A. | Element |
| B. | Compound |
| C. | Atom |
| D. | Molecule |
| Answer» E. | |
| 962. |
Mixture of ice and water form a? |
| A. | Closed system |
| B. | Open system |
| C. | Isolated system |
| D. | Heterogeneous system |
| Answer» E. | |
| 963. |
Total heat of a substance is also known as? |
| A. | Internal energy |
| B. | Entropy |
| C. | Thermal capacity |
| D. | Enthalpy |
| Answer» E. | |
| 964. |
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 | |
| 965. |
During which of the following process does heat rejection takes place in Carnot cycle?? |
| A. | Isothermal expansion |
| B. | Isentropic expansion |
| C. | Isothermal compression |
| D. | Isentropic compression |
| Answer» D. Isentropic compression | |
| 966. |
The unit of time in S.I. units is? |
| A. | Second |
| B. | Minute |
| C. | Hour |
| D. | Day |
| Answer» B. Minute | |
| 967. |
Water contained in a beaker can be made to boil by passing steam through it? |
| A. | At atmospheric pressure |
| B. | At a pressure greater than atmospheric pressure |
| C. | Any pressure |
| D. | Not possible |
| Answer» C. Any pressure | |
| 968. |
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 | |
| 969. |
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) | |
| 970. |
The following cycle is used for air craft refrigeration? |
| A. | Brayton cycle |
| B. | Joule cycle |
| C. | Carnot cycle |
| D. | Reversed Brayton cycle |
| Answer» E. | |
| 971. |
When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.? |
| A. | Atomization |
| B. | Carbonization |
| C. | Combustion |
| D. | None of these |
| Answer» C. Combustion | |
| 972. |
The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)? |
| A. | rγ - 1 |
| B. | 1 - rγ - 1 |
| C. | 1 - (1/r) γ/γ - 1 |
| D. | 1 - (1/r) γ - 1/ γ |
| Answer» E. | |
| 973. |
If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to? |
| A. | +ve |
| B. | -ve |
| C. | Zero |
| D. | Anywhere between zero and infinity |
| Answer» D. Anywhere between zero and infinity | |
| 974. |
The efficiency of Stirling cycle is __________ Carnot cycle.? |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | None of these |
| Answer» D. None of these | |
| 975. |
A cycle consisting of two adiabatic and two constant pressure processes is known as |
| A. | Otto cycle |
| B. | Ericsson cycle |
| C. | Joule cycle |
| D. | Stirling cycle |
| Answer» D. Stirling cycle | |
| 976. |
The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant) |
| A. | pv = mRT |
| B. | pv = RTm |
| C. | pvm = C |
| D. | pv = (RT)m |
| Answer» B. pv = RTm | |
| 977. |
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle |
| A. | Heat rejection is lower |
| B. | Expansion and compression are isentropic |
| C. | Combustion is at constant volume |
| D. | Maximum temperature is higher |
| Answer» B. Expansion and compression are isentropic | |
| 978. |
Work done in a free expansion process is |
| A. | Zero |
| B. | Maximum |
| C. | Minimum |
| D. | Positive |
| Answer» B. Maximum | |
| 979. |
First law of thermodynamics deals with |
| A. | Conservation of heat |
| B. | Conservation of momentum |
| C. | Conservation of mass |
| D. | Conservation of energy |
| Answer» E. | |
| 980. |
Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits? |
| A. | O‚ÇÇ, N‚ÇÇ, steam, CO‚ÇÇ |
| B. | O‚ÇÇ, N‚ÇÇ, water vapour |
| C. | SO‚ÇÇ, NH‚ÇÉ, CO‚ÇÇ, moisture |
| D. | O‚ÇÇ, N‚ÇÇ, H‚ÇÇ, air |
| Answer» E. | |
| 981. |
Which of the following is the extensive property of a thermodynamic system? |
| A. | Pressure |
| B. | Volume |
| C. | Temperature |
| D. | Density |
| Answer» C. Temperature | |
| 982. |
When the gas is cooled at constant pressure, |
| A. | Its temperature increases but volume decreases |
| B. | Its volume increases but temperature decreases |
| C. | Both temperature and volume increases |
| D. | Both temperature and volume decreases |
| Answer» E. | |
| 983. |
According to first law of thermodynamics |
| A. | Work done by a system is equal to heat transferred by the system |
| B. | Total internal energy of a system during a process remains constant |
| C. | Internal energy, enthalpy and entropy during a process remain constant |
| D. | Total energy of a system remains constant |
| Answer» E. | |
| 984. |
An ideal gas as compared to a real gas at very high pressure occupies |
| A. | More volume |
| B. | Less volume |
| C. | Same volume |
| D. | Unpredictable behavior |
| Answer» B. Less volume | |
| 985. |
Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | Internal energy |
| Answer» B. Temperature | |
| 986. |
Which is the incorrect statement about Carnot cycle? |
| A. | All the heat engines are based on Carnot cycle |
| B. | It is used as the alternate standard of comparison of all heat engines |
| C. | It provides concept of maximising work output between the two temperature limits |
| D. | All of the above |
| Answer» B. It is used as the alternate standard of comparison of all heat engines | |
| 987. |
In an irreversible process, there is a |
| A. | No loss of heat |
| B. | Loss of heat |
| C. | Gain of heat |
| D. | No gain of heat |
| Answer» C. Gain of heat | |
| 988. |
The principal constituents of a fuel are |
| A. | Carbon and hydrogen |
| B. | Oxygen and hydrogen |
| C. | Sulphur and oxygen |
| D. | Sulphur and hydrogen |
| Answer» B. Oxygen and hydrogen | |
| 989. |
The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as |
| A. | Enthalpy |
| B. | Internal energy |
| C. | Entropy |
| D. | External energy |
| Answer» D. External energy | |
| 990. |
Brayton cycle consists' of following four processes |
| A. | Two isothermal and two isentropic |
| B. | Two isentropic and two constant volumes |
| C. | Two isentropic, one constant volume and one constant pressure |
| D. | Two isentropic and two constant pressures |
| Answer» E. | |
| 991. |
The value of 1 mm of Hg is equal to |
| A. | 1.333 N/m2 |
| B. | 13.33 N/m2 |
| C. | 133.3 N/m2 |
| D. | 1333 N/m2 |
| Answer» D. 1333 N/m2 | |
| 992. |
The heating of a gas at constant pressure is governed by |
| A. | Boyle's law |
| B. | Charles' law |
| C. | Gay-Lussac law |
| D. | Avogadro's law |
| Answer» C. Gay-Lussac law | |
| 993. |
The natural solid fuel is |
| A. | Wood |
| B. | Coke |
| C. | Pulverised coal |
| D. | Anthracite coal |
| Answer» B. Coke | |
| 994. |
Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to |
| A. | T |
| B. | J |
| C. | J² |
| D. | Vr |
| Answer» B. J | |
| 995. |
The main cause for the irreversibility is |
| A. | Unrestricted expansion |
| B. | Mechanical and fluid friction |
| C. | Heat transfer with a finite temperature difference |
| D. | All of the above |
| Answer» E. | |
| 996. |
Which of the following is an irreversible cycle? |
| A. | Carnot |
| B. | Stirling |
| C. | Ericsson |
| D. | None of the above |
| Answer» E. | |
| 997. |
A cycle consisting of two isothermal and two isentropic processes, is known as |
| A. | Carnot cycle |
| B. | Stirling cycle |
| C. | Ericsson cycle |
| D. | Joule cycle |
| Answer» B. Stirling cycle | |
| 998. |
The general law for the expansion or compression of gases, is |
| A. | pv = C |
| B. | pv = m R T |
| C. | pvn = C |
| D. | pvγ = C |
| Answer» D. pv≈í‚â• = C | |
| 999. |
Which of the following items is not a path function? |
| A. | Heat |
| B. | Work |
| C. | Kinetic energy |
| D. | Thermal conductivity |
| Answer» E. | |
| 1000. |
The measurement of a thermodynamic property known as temperature is based on |
| A. | First law of thermodynamics |
| B. | Second law of thermodynamics |
| C. | Zeroth law of thermodynamics |
| D. | None of these |
| Answer» D. None of these | |