Thermodynamics Set 14

Mechanical Engineering

Practice Mode Previous Next
On This Page

This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on Thermodynamics Set 14

Q1 | Kelvin's law deals with
  • conservation of work
  • conservation of heat
  • conversion of work into heat
  • conversion of heat into work
  • Pulsejet
Answer: conversion of heat into work
Q2 | The processes of a Carnot cycle are
  • Two adiabatic and two constant volume
  • Two constant volume and two isothermals
  • Two isothermals and two isentropics
  • Two adiabatics and two isothermals
  • One constant volume one constant pressure and two isentropics
Answer: Two isothermals and two isentropics
Q3 | Theoretically in a petrol engine during which stroke both suction as well as exhaust valves will remain closed?
  • Suction stroke
  • Exhaust stroke
  • Both suction and exhaust strokes
  • None of the above
  • Pulsejet
Answer: None of the above
Q4 | Wavelength is generally measured in
  • microns
  • mm
  • km
  • m
  • cm
Answer: microns
Q5 | The unit of Universal Gas constant is
  • Dynes/?K
  • erg/?K
  • kcal/?K
  • It is dimensionless
  • W/m?K
Answer: erg/?K
Q6 | Pipes are insulated so that
  • They may not break under pressure
  • There is minimum corrosion
  • Capacity to withstand pressure is increased
  • Heat loss from the surface is minimized
  • None of the above
Answer: Heat loss from the surface is minimized
Q7 | The process that follows the equation pvn = constant, is called
  • Adiabatic process
  • Constant pressure process
  • Constant volume process
  • Constant temperature process
  • Polytropic process
Answer: Polytropic process
Q8 | The total radiant energy emitted by a plane surface per unit area and unit time is called
  • Radiant flux density
  • Total absorptivity
  • Radiant energy
  • Radiant intensity
  • None of the above
Answer: Radiant flux density
Q9 | Maxwells relations are valid for
  • compressible substances
  • all substances solid, liquid or gas
  • systems of fixed chemical compositions
  • Pulsejet
  • homogeneous as well as heterogeneous systems
Answer: compressible substances
Q10 | Clog point of an oil is
  • The point of maximum contamination of oil
  • The level of impurities beyond which oil ceases to flow
  • The temperature at which oil solidifies
  • The temperature at which paraffin and waxes in oil start precipitating
  • None of the above
Answer: The temperature at which paraffin and waxes in oil start precipitating
Q11 | Line's liquifer is based on the principle of
  • Pulsejet
  • Joule-Thomson effect
  • adiabatic magnetisation
  • adiabatic expansion
  • adiabatic demagnetisation
Answer: adiabatic expansion
Q12 | A process which does not dissipate available energy is known as
  • Adiabatic process
  • Frictionless process
  • Isothermal process
  • Energyless process
  • Ideal process
Answer: Ideal process
Q13 | Gas laws are applicable to
  • Gases and dry, wet and super-heated vapours
  • Gases only
  • Gases and dry and wet vapours
  • Gases and wet vapours
  • Gases and dry vapours
Answer: Gases only
Q14 | In an optimum four stage compressor system the first and third stage pressure are 1 kg/cm2 and 9 kg/cm2 respectively what will be the fourth stage delivery pressure?
  • 81 kg/cm2
  • 27 kg/cm2
  • 9 kg/cm2
  • 6 kg/cm2
  • 3 kg/cm2
Answer: 81 kg/cm2
Q15 | In unsteady state, heat transfer occurs when
  • The body through which heat flow is in motion
  • The source of heat is in motion
  • The heat flow changes with change in temperature
  • The heat flow changes with time
  • None of the above
Answer: The heat flow changes with time
Q16 | At critical point the latent enthalpy of vaporisation is
  • Only depends on temperature
  • Zero
  • Maximum
  • Minimum
  • None of the above
Answer: Zero
Q17 | Which of the following relation is not valid for throttling process?
  • Enthalpy before expansion = Enthalpy after expansion
  • Pressure before expansion = pressure after expansion
  • External work done = Zero
  • Mass before expansion = mass after expansion
  • None of the above
Answer: Pressure before expansion = pressure after expansion
Q18 | The specific heat of a perfect gas is a function of
  • temperature, pressure and entropy only
  • temperature only
  • temperature and pressure only
  • Pulsejet
  • temperature and entropy only
Answer: temperature only
Q19 | One watt is the same as
  • 100 Nm/s
  • 10 Nm/s
  • 1 Nm/s
  • 1 Nm/min
  • 10 Nm/min
Answer: 1 Nm/s
Q20 | Within the boiler, the temperature of steam is highest in
  • Super heater
  • Temperature remains constant
  • Water walls
  • Water drum
  • Water tubes
Answer: Super heater
Q21 | The rate of diffusion along a column of certain cross-sectional area is proportional to the concentration gradient. Above statement is known as
  • Thompson's law
  • Law of diffusion
  • Kirchhoff's law
  • Fick's law
  • None of the above
Answer: Fick's law
Q22 | 1 kgf/cm2 is equal to
  • 776 mm Hg
  • 1 mm Hg
  • 760 mm Hg
  • 735.6 mm Hg
  • 100 mm Hg
Answer: 735.6 mm Hg
Q23 | If molar Cp = 4.97 then
  • Cv = 2.97
  • Cv = 0.97
  • Cv = 5.97
  • Cv = 0.597
  • Cv = 1.97
Answer: Cv = 2.97
Q24 | The value of the product of molecular weight and the gas characteristic constant for all gases in kgf m/1 kg mol ?K is
  • 848
  • 427
  • 770
  • 29.27
  • 30
Answer: 427
Q25 | Isentropic flow is
  • Perfect gas flow
  • Reversible adiabatic flow
  • Ideal fluid flow
  • Irreversible adiabatic flow
  • Frictionaless reversible flow
Answer: Reversible adiabatic flow
Previous Next