Engineering Thermodynamics MCQ

Test your knowledge with important Engineering Thermodynamics MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Engineering Thermodynamics MCQs at Bissoy

• One kg of carbon monoxide requires $$\frac{4}{7}$$ kg of oxygen and produces
  ক

  $$\frac{{11}}{3}$$ kg of carbon dioxide gas

  খ

  $$\frac{7}{3}$$ kg of carbon monoxide gas

  গ

  $$\frac{{11}}{7}$$ kg of carbon dioxide gas

  ঘ

  $$\frac{8}{3}$$ kg of carbon monoxide gas
• One kg of hydrogen requires 8 kg of oxygen and produces
  ক

  1 kg of water

  খ

  7 kg of water

  গ

  8 kg of water

  ঘ

  9 kg of water
• The efficiency of Carnot cycle depends upon
  ক

  Temperature limits

  খ

  Volume compression ratio

  গ

  Cut-off ratio and compression ratio

  ঘ

  Pressure ratio
• The work ratio of simple gas turbine cycle depends upon
  ক

  Maximum cycle temperature

  খ

  Minimum cycle temperature

  গ

  Pressure ratio

  ঘ

  All of these
• The efficiency of Diesel cycle depends upon
  ক

  Pressure ratio

  খ

  Cut-off ratio and compression ratio

  গ

  Temperature limits

  ঘ

  Compression ratio
• Carnot cycle efficiency is maximum when
  ক

  Initial temperature is 0°K

  খ

  Final temperature is 0°K

  গ

  Difference between initial and final temperature is 0°K

  ঘ

  Final temperature is 0°C
• The efficiency of the Carnot cycle may be increased by
  ক

  Increasing the highest temperature

  খ

  Decreasing the highest temperature

  গ

  Increasing the lowest temperature

  ঘ

  Keeping the lowest temperature constant
• In a free expansion process,
  ক

  W1 - 2 = 0

  খ

  Q1 - 2 = 0

  গ

  dU = 0

  ঘ

  All of these
• No liquid can exist as liquid at
  ক

  273°K

  খ

  Vacuum

  গ

  Zero pressure

  ঘ

  Centre of earth
• Which of the following cycles has maximum efficiency?
  ক

  Rankine

  খ

  Stirling

  গ

  Carnot

  ঘ

  Brayton
• Minimum work in compressor is possible when the value of adiabatic index ‘n’ is equal to
  ক

  0.75

  খ

  1

  গ

  1.27

  ঘ

  1.35
• The polytropic index (n) is given by
  ক

  $$\frac{{\log \left( {{{\text{p}}_1}{{\text{p}}_2}} \right)}}{{\log \left( {{{\text{v}}_1}{{\text{v}}_2}} \right)}}$$

  খ

  $$\frac{{\log \left( {\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}} \right)}}{{\log \left( {\frac{{{{\text{v}}_1}}}{{{{\text{v}}_2}}}} \right)}}$$

  গ

  $$\frac{{\log \left( {\frac{{{{\text{v}}_1}}}{{{{\text{v}}_2}}}} \right)}}{{\log \left( {\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}}} \right)}}$$

  ঘ

  $$\log \left( {\frac{{{{\text{p}}_1}{{\text{v}}_1}}}{{{{\text{p}}_2}{{\text{v}}_2}}}} \right)$$
• An adiabatic wall is one which
  ক

  Prevents thermal interaction

  খ

  Permits thermal interaction

  গ

  Encourages thermal interaction

  ঘ

  Discourages thermal interaction
• A diathermic wall is one which
  ক

  Prevents thermal interaction

  খ

  Permits thermal interaction

  গ

  Encourages thermal interaction

  ঘ

  Discourages thermal interaction
• The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
  ক

  Kilo Joule

  খ

  Specific heat at constant volume

  গ

  Specific heat at constant pressure

  ঘ

  None of these
• Which of the following processes is irreversible process?
  ক

  Isothermal

  খ

  Adiabatic

  গ

  Throttling

  ঘ

  All of the above
• Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
  ক

  Heat rejection is lower

  খ

  Expansion and compression are isentropic

  গ

  Combustion is at constant volume

  ঘ

  Maximum temperature is higher
• The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of
  ক

  0.224 liters

  খ

  2.24 liters

  গ

  22.4 liters

  ঘ

  224 liters
• Compressed air coming out from a punctured football
  ক

  Becomes hotter

  খ

  Becomes cooler

  গ

  Remains at the same temperature

  ঘ

  May become hotter or cooler depending upon the humidity of the surrounding air
• Carnot cycle has maximum efficiency for
  ক

  Reversible engine

  খ

  Irreversible engine

  গ

  Petrol engine

  ঘ

  Diesel engine
• Which of the following quantities is not the property of the system?
  ক

  Pressure

  খ

  Temperature

  গ

  Specific volume

  ঘ

  Heat
• Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure
  ক

  Enthalpy

  খ

  Volume

  গ

  Mass

  ঘ

  Entropy
• The efficiency and work ratio of a simple gas turbine cycle are
  ক

  Very low

  খ

  Low

  গ

  High

  ঘ

  Very high
• According to Avogadro's law
  ক

  The product of the gas constant and the molecular mass of an ideal gas is constant

  খ

  The sum of partial pressure of the mixture of two gases is sum of the two

  গ

  Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules

  ঘ

  All of the above
• According to Avogadro’s law
  ক

  The product of the gas constant and the molecular mass of an ideal gas is constant

  খ

  The sum of partial pressure of the mixture of two gases is sum of the two

  গ

  Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules

  ঘ

  All of the above
• Which of the following gas is mostly used in town for street and domestic lighting and heating?
  ক

  Mond gas

  খ

  Coal gas

  গ

  Producer gas

  ঘ

  Coke oven gas
• The ultimate analysis of coal consists of the determination of the percentage of
  ক

  Carbon

  খ

  Hydrogen and nitrogen

  গ

  Sulphur and ash

  ঘ

  All of these
• Kinetic theory of gases assumes that the collisions between the molecules are
  ক

  Perfectly elastic

  খ

  Perfectly inelastic

  গ

  Partly elastic

  ঘ

  Partly inelastic
• When the gas is heated at constant volume, the heat supplied
  ক

  Increases the internal energy of the gas and increases the temperature of the gas

  খ

  Does some external work during expansion

  গ

  Both (A) and (B)

  ঘ

  None of these
• When the gas is heated at constant pressure, the heat supplied
  ক

  Increases the internal energy of the gas

  খ

  Increases the temperature of the gas

  গ

  Does some external work during expansion

  ঘ

  Both (B) and (C)