320 Important Engineering Thermodynamics MCQ Question and Answer | PDF Free Download
1.Diesel cycle consists of following four processes
- ATwo isothermal and two isentropic
- BTwo isentropic and two constant volumes
- CTwo isentropic, one constant volume and one constant pressure
- DTwo isentropic and two constant pressures
2.The energy of molecular motion appears as
- AHeat
- BPotential energy
- CSurface tension
- DFriction
3.According to Avogadro's law, for a given pressure and temperature, each molecule of a gas
- AOccupies same volume
- BOccupies volume proportional to its specific weight
- COccupies volume inversely proportional to its molecular weight
- DOccupies volume inversely proportional to its specific weight
4.Which of the following is an intensive property of a thermodynamic system?
- AMass
- BTemperature
- CEnergy
- DVolume
5.Which of the following is the extensive property of a thermodynamic system?
- APressure
- BVolume
- CTemperature
- DDensity
6.The door of a running refrigerator inside a room was left open. Which of the following statements is correct?
- AThe room will be cooled to the temperature inside the refrigerator
- BThe room will be cooled very slightly
- CThe room will be gradually warmed up
- DThe temperature of the air in room will remain unaffected
7.A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called
- AIsothermal process
- BHyperbolic process
- CAdiabatic process
- DPolytropic process
8.The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that
- ACarnot cycle can't work with saturated steam
- BHeat is supplied to water at temperature below the maximum temperature of the cycle
- CA Rankine cycle receives heat at two places
- DRankine cycle is hypothetical
9.Which of the following is a reversible non-flow process?
- AIsochoric process
- BIsobaric process
- CHyperbolic process
- DAll of these
10.The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as
- AEnthalpy
- BInternal energy
- CEntropy
- DExternal energy
11.The value of one bar (in S. I. units) is equal to
- A1 × 102 N/m2
- B1 × 103 N/m2
- C1 × 104 N/m2
- D1 × 105 N/m2
12.Which law states that the internal energy of a gas is a function of temperature?
- ACharles' law
- BJoule's law
- CBoyle's law
- DThere is no such law
13.The standard value of atmospheric pressure taken at sea level is
- A1.013 bar
- B760 mm of Hg
- C1013 × 102 N/m2
- DAll of these
14.In order that a cycle be reversible, following must be satisfied
- AFree expansion or friction resisted expansion/compression process should not be encountered
- BWhen heat is being absorbed, temperature of hot source and working substance should be same
- CWhen beat is being rejected, temperature of cold source and working substance should be same
- DAll of the above
15.Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?
- AO₂, N₂, steam, CO₂
- BO₂, N₂, water vapour
- CSO₂, NH₃, CO₂, moisture
- DO₂, N₂, H₂, air
16.A perpetual motion machine is
- AA thermodynamic machine
- BA non-thermodynamic machine
- CA hypothetical machine
- DA hypothetical machine whose operation would violate the laws of thermodynamics
17.When the expansion or compression takes place according to the law pvn = C, the process is known as
- AIsothermal process
- BAdiabatic process
- CHyperbolic process
- DPolytropic process
18.The gas constant (R) is equal to the __________ of two specific heats.
- AProduct
- BSum
- CDifference
- DRatio
19.The compression ratio is the ratio of
- ATotal volume to swept volume
- BSwept volume to clearance volume
- CSwept volume to total volume
- DTotal volume to clearance volume
20.The principal constituents of a fuel are
- ACarbon and hydrogen
- BOxygen and hydrogen
- CSulphur and oxygen
- DSulphur and hydrogen