Thermodynamics Set 1

Mechanical Engineering

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This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on Thermodynamics Set 1

Q1 | Which of the following cycle is less efficient as compared to the remaining?
  • Carnot cycle
  • All have identical efficiency
  • Stirling cycle
  • Ericsson cycle
  • Otto cycle
Answer: Otto cycle
Q2 | The number of degrees of freedom in case of triatomic gases is
  • 5
  • 3
  • 6
  • 4
  • 2
Answer: 6
Q3 | At critical point the enthalpy of vaporisation is
  • Only dependent on temperature
  • Zero
  • Maximum
  • Minimum
  • None of the above
Answer: Zero
Q4 | In which of the following case the process of sublimation can occur?
  • Solid nitrogen
  • Solid carbondioxide
  • Liquid air
  • Solid oxygen
  • Sodium
Answer: Solid carbondioxide
Q5 | Work done in a free expansion process is
  • Negative
  • Positive
  • Maximum
  • Zero
  • Minimum
Answer: Zero
Q6 | If a system neither exchange mass nor energy with the surroundings, it is known as
  • Semi-closed system
  • Isolated system
  • Inactive system
  • Closed system
  • Segregated system
Answer: Isolated system
Q7 | Food can be cooked quicker in a pressure cooker because
  • Less heat is lost
  • High pressure steam has high temperature
  • Steam remains within the cooker
  • It is made of a metal
  • None of the above
Answer: Steam remains within the cooker
Q8 | A surface which diffusely reflects and emits tha same amount of energy which it receives by radiation, is known as
  • A perfect surface
  • A perfect grey surface
  • A perfect white surface
  • A perfect radiating surface
  • None of the above
Answer: A perfect radiating surface
Q9 | Exhaust gases from a engine possess
  • Chemical energy
  • Solar energy
  • Potential energy
  • Stored energy
  • Kinetic energy
Answer: Kinetic energy
Q10 | Which one of the following is an indirect reaction device?
  • Turbojet
  • Ramjet
  • Pulsejet
  • Propeller
  • All of the above
Answer: Propeller
Q11 | Cetane number of a diesel fuel is a measure of its
  • volatility
  • Pulsejet
  • delay period
  • viscosity
  • ignition quality
Answer: ignition quality
Q12 | A thermistor is a
  • Thermocouple
  • Thermometer
  • Thermos flask
  • Miniature resistance
  • None of the above
Answer: Miniature resistance
Q13 | Which of the following is a reversible process?
  • Extension and compression of a spring
  • Diffusion
  • Free expansion
  • Throttling
  • Combustion
Answer: Extension and compression of a spring
Q14 | Power required for the engine is
  • 7.75 kW
  • 8.88 kW
  • 9.23 kW
  • 6.60 kW
  • Pulsejet
Answer: 9.23 kW
Q15 | According to Charle's law
  • At constant pressure the volume of a gas is proportional to its temperature
  • At constant pressure the volume of a gas is proportional to its absolute temperature
  • At constant gauge pressure the molecular folume of a gas is proportional to its absolute temperature
  • At constant volume the absolute pressure is proportional to absolute temperature
  • None of the above
Answer: At constant pressure the volume of a gas is proportional to its temperature
Q16 | The mean free path of a gas least depends on
  • volume of gas
  • viscosity of gas
  • Pulsejet
  • density of gas
  • pressure of gas
Answer: volume of gas
Q17 | The value of universal gas constant in S.I. units is
  • 831.4 J/kg mole/?k
  • 8314 J/kg mole/?k
  • 8.314 J/kg mole/?k
  • 83.14 J/kg mole/?k
  • 0.8314 J/kg mole/?k
Answer: 8314 J/kg mole/?k
Q18 | Which of the following valve is installed between the boiler and the feed pump?
  • Flow of cock
  • Pulsejet
  • Steam stop valve
  • Throttle valve
  • Feed check valve
Answer: Feed check valve
Q19 | Thermodynamic equilibrium is completely defined by the specifications of
  • Internal energy
  • Enthalpy
  • Generalized displacements
  • All the above together
  • None of the above
Answer: All the above together
Q20 | A gas (inversion temperature Ti) undergoing Joule Thomson expansion at temperature T will produce cooling effect only when
  • Ti < T
  • Ti > T
  • Pulsejet
  • Ti = T
Answer: Ti < T
Q21 | During an adiabatic expansion, the increase in volume is associated with
  • decrease in pressure and increase in temperature
  • increase in pressure and decrease in temperature
  • Decrease in pressure and decrease in temperature
  • Pulsejet
  • increase in pressure and increase in temperature
Answer: Decrease in pressure and decrease in temperature
Q22 | The mean free path of a gas molecule increases with
  • increase in pressure
  • increase in density
  • increase in temperature
  • Pulsejet
  • decrease in temperature
Answer: increase in temperature
Q23 | In a Carnot cycle the heat is rejected at
  • Constant pressure
  • Constant temperature
  • Constant entropy
  • Constant enthalpy
  • Constant volume
Answer: Constant temperature
Q24 | Which of the following statement is incorrect?
  • Total heat of steam is less than the total weight of dry and super saturated steam
  • Total heat of super heated steam is more than the total heat of wet steam
  • Latent heat of steam at critical pressure is zero
  • Latent heat per kg of steam decreases as the pressure of steam increases
  • None of the above
Answer: Latent heat per kg of steam decreases as the pressure of steam increases
Q25 | Non-dimensional numbers generally involved in case of heat transfer from horizontal cylinders by natural convection are
  • Reynolds number
  • Nusselt number
  • Prandtl number
  • Grashof number
  • (B), (C) and (D) above
Answer: (B), (C) and (D) above
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