Thermodynamics Set 11

Mechanical Engineering

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This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on Thermodynamics Set 11

Q1 | On a Mollier chart the flow through turbine is represented by
  • Horizontal line
  • Vertical line
  • Curved line convex up
  • Carved line convex down
  • None of the above
Answer: Vertical line
Q2 | Which of the following turbines cannot be set below the maximum tail race level
  • Kaplan
  • Pelton
  • Francis
  • Propeller
  • Energyless process
Answer: Kaplan
Q3 | The fact that the product of pressure and volume of a fixed amount of gas is of approximately constant value is known as
  • Dalton's law
  • None of these
  • Gay Lussac's law
  • Charle's law
  • Lewis law
Answer: None of these
Q4 | Steady state heat transfer occurs when
  • The flow of heat is uniformly decreasing
  • The flow of heat is uniform
  • The flow of heat is independent of time
  • The flow of heat is negligible
  • The flow of heat is uniformly increasing
Answer: The flow of heat is independent of time
Q5 | The air standard efficiency of a turbine cycle is 57%. Which one of the following may be Carnot efficiency between the temperature limits of the cycle?
  • 57%
  • 50%
  • 64%
  • 55%
  • 100%
Answer: 64%
Q6 | It is impossible to construct a heat engine which operates in a cycle and receives a given amount of heat from a high temperature body and does equal amount of work". Which of the following name is associated with the above statement?
  • Gay Lussac
  • Kinetic theory
  • Kelvin-planck
  • Joule-thomson
  • None of the above
Answer: Kelvin-planck
Q7 | For a reversible adiabatic process the change in entropy is
  • Unity
  • Zero
  • Maximum
  • Minimum
  • Infinite
Answer: Zero
Q8 | Whenever a system undergoes either a change in state or an energy or mass transfer at a steady state, it is said to undergo
  • A steady state transfer
  • A thermodynamic change
  • An equilibrium
  • A process
  • A change of state
Answer: A process
Q9 | In case the thermal efficiency of an engine becomes 100% it will violate
  • Zeroth law of thermodynamics
  • First law of thermodynamics
  • Second law of thermodynamics
  • Third law of thermodynamics
  • None of the above
Answer: Second law of thermodynamics
Q10 | The number of degrees of freedom for a diatomic molecule is
  • 3
  • 6
  • 5
  • 4
  • Pulsejet
Answer: 5
Q11 | Which of the following is not a positive displacement compressor?
  • Centrifugal compressor?
  • Vane type compressor
  • Roots blower
  • Double acting reciprocating compressor
  • Single stage reciprocating compressor
Answer: Centrifugal compressor?
Q12 | The internal energy of a substance depdnds on
  • Velocity
  • Pressure
  • Entropy
  • Temperature
  • Volume
Answer: Temperature
Q13 | According to Kinetic theory of gases, at absolute zero
  • Pressure of gas will reduce to zero
  • Mass of gas will reduce to zero
  • Volume of gas will reduce to zero
  • Kinetic energy of gas molecules will reduce to zero
  • Specific heat of molecules will reduce to zero
Answer: Kinetic energy of gas molecules will reduce to zero
Q14 | The temperature of a gas is a measure of
  • the average kinetic energy of the gaseous molecules
  • the average distance between the molecules of the gas
  • The average potential energy of the molecules
  • None of the above
  • Pulsejet
Answer: the average kinetic energy of the gaseous molecules
Q15 | Which of the following is conserved across a shock wave?
  • Temperature
  • Pressure
  • Momentum
  • All of the above
  • Temperature remains constant
Answer: Momentum
Q16 | A cycle which consists of two adiabatic and two constant volume processes is known as
  • Pulsejet
  • Diesel cycle
  • Carnot cycle
  • Stirling cycle
  • Otto cycle
Answer: Otto cycle
Q17 | If the roof of a house is replaced by a shiny metallic surface the temperature inside will
  • microns
  • Decrease
  • Increase
  • Remain unaltered
Answer: Decrease
Q18 | In an isothermal process
  • Pressure remains constant
  • Change in internal energy is zero
  • Enthalpy change is maximum
  • Volume remains constant
  • Temperature increases gradually
Answer: Change in internal energy is zero
Q19 | A 500 litre tank contains a saturated mixture of steam and water at 300?C. If the mass of steam and water within the tank is equal, it can be concluded that
  • Steam will be nearly dry and saturated
  • volume of steam will be less than the volume of water
  • Pulsejet
  • Dryness fraction of steam will be closer to 0.5
  • Volume of steam will be less than the volume of water
Answer: Volume of steam will be less than the volume of water
Q20 | When a fluid is passed in steady, flow through a porous plug in a duct under such conditions that heat transfer, kinetic energy change and potential change is negligible, the process is called
  • Throttling
  • Separation
  • Constant pressure compression
  • Isothermal compression
  • Frictionless compression
Answer: Throttling
Q21 | In adiabatic compression the decrease in volume is associated with
  • Pulsejet
  • decrease in temperature and increase in pressure
  • increase in temperature and increase in pressure
  • increase in temperature and decrease in pressure
  • decrease in temperature and decrease in pressure
Answer: increase in temperature and increase in pressure
Q22 | A Brayton cycle is also a reversed
  • Carnot cycle
  • Dual cycle
  • Joule cycle
  • Otto cycle
  • Rankine cycle
Answer: Joule cycle
Q23 | For diatomic gas flowing through a nozzle the critical pressure ratio is given by
  • 0.577
  • 0.546
  • 0.75
  • 1
  • 0.528
Answer: 0.528
Q24 | The molecular volume of any perfect gas at 600 x 103 N/m3 and 27?C will be
  • 41.7 m3/kg mol
  • 4.17 m3/kg mol
  • 47.7 m3/kg mol
  • 2.085 m3/kg mol
  • 85.3 m3/kg mol
Answer: 4.17 m3/kg mol
Q25 | In a 2 stroke engine we get one power stroke in
  • 180? of crank rotation
  • 540? of crank rotation
  • 360? of crank rotation
  • 270? of crank rotation
  • 720? of crank rotation
Answer: 360? of crank rotation
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