Engineering Thermodynamics — Part 2 MCQs with Explanations

Kilo-Joule is the correct answer to “The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Remain constant is the correct answer to “In an isothermal process, the internal energy of gas molecules”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

When molecular momentum of the system becomes zero is the correct answer to “The absolute zero pressure will be”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Charle's law is the correct answer to “According to which law, all perfect gases change in volume by $${\frac{1}{{273}}^{{\text{th}}}}$$ of their original volume at 0°C for every 1°C change in temperature when pressure remains constant”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Non-coking bituminous coal is the correct answer to “The fuel mostly used in steam boilers is”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Perfect gas is the correct answer to “For which of the following substances, the internal energy and enthalpy are the functions of temperature only”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel is the correct answer to “The mass of flue gas per kg of fuel is the ratio of the”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Joule's cycle is the correct answer to “An open cycle gas turbine works on”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

1 Nm/s is the correct answer to “One watt is equal to”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Zero is the correct answer to “If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Temperature is the correct answer to “The specific heat of air increases with increase in”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Difference of two specific heats is the correct answer to “The gas constant (R) is equal to the”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Second kind is the correct answer to “According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Equal to is the correct answer to “The efficiency of Ericsson cycle is __________ Carnot cycle.”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Greater than is the correct answer to “The efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle.”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Less than is the correct answer to “For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

One constant pressure, one constant volume and two isentropic is the correct answer to “Diesel cycle consists of __________ processes.”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Carbonization is the correct answer to “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.”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Irreversible is the correct answer to “The throttling process is __________ process.”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Less than is the correct answer to “The atomic mass of nitrogen is __________ oxygen.”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Three is the correct answer to “A tri-atomic molecule consists of __________ atoms.”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Conversion of heat into work is the correct answer to “Kelvin-Planck’s law deals with”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

$$1 - {\left( {\frac{1}{{\text{r}}}} \right)^{\frac{{\gamma - 1}}{\gamma }}}$$ is the correct answer to “The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Not possible is the correct answer to “A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227°C and 27°C. His claim is”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

$${{\text{C}}_{\text{p}}} - {{\text{C}}_{\text{v}}}$$ is the correct answer to “Characteristic gas constant of a gas is equal to”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

All of these is the correct answer to “The variables which control the physical properties of a perfect gas are”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature is the correct answer to “According to Avogadro's Hypothesis”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Reversed Brayton cycle is the correct answer to “The following cycle is used for air craft refrigeration”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Isentropically is the correct answer to “In closed cycle gas turbine, the air is compressed”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

327°C is the correct answer to “A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

A temperature of -273.16°C is the correct answer to “The condition of perfect vacuum, i.e., absolute zero pressure can be attained at”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Zero is the correct answer to “Work done in a free expansion process is”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

1.086 is the correct answer to “The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Absolute temperature, if volume is kept constant is the correct answer to “According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Joule is the correct answer to “The heat and mechanical energies are mutually convertible. This statement was established by”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Passing air and a large amount of steam over waste coal at about 650°C is the correct answer to “Mond gas is obtained by”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast is the correct answer to “Producer gas is obtained by”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

All of the above is the correct answer to “In open cycle gas turbine plants”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

32 is the correct answer to “The atomic mass of sulphur is”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.

Zeroth law of thermodynamics is the correct answer to “When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called”. This question is standard in competitive examination syllabi for Engineering Thermodynamics.