320 Important Engineering Thermodynamics MCQ Question and Answer | PDF Free Download
1.The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when
- AFlow is uniform and steady
- BProcess is isentropic
- CProcess is isothermal
- DProcess is isentropic and specific heat does not change with temperature
2.Universal gas constant is defined as equal to product of the molecular weight of the gas and
- ASpecific heat at constant pressure
- BSpecific heat at constant volume
- CRatio of two specific heats
- DGas constant
3.During throttling process
- AHeat exchange does not take place
- BNo work is done by expanding steam
- CThere is no change of internal energy of steam
- DAll of the above
4.Heat and work are
- APoint functions
- BSystem properties
- CPath functions
- DIntensive properties
5.Petrol is distilled at
- A65° to 220°C
- B220° to 345°C
- C345° to 470°C
- D470° to 550°C
6.In S. I. units, the value of the universal gas constant is
- A8.314 J/kg mole-K
- B83.14 J/kg mole-K
- C831.4 J/kg mole-K
- D8314 J/kg mole-K
7.If value of n is infinitely large in a polytropic process pVn = C, then the process is known as constant
- AVolume
- BPressure
- CTemperature
- DEnthalpy
8.The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is
- A29.27 kgfm/mol °K
- B8314 kgfm/mol °K
- C848 kgfm/mol °K
- D427 kgfm/mol °K
9.Which of the following has the minimum atomic mass?
- ASulphur
- BNitrogen
- COxygen
- DCarbon
10.Which of the following has the minimum atomic mass?
- ASulphur
- BNitrogen
- COxygen
- DCarbon
11.The behavior of super-heated vapour is similar to that of
- APerfect gas
- BAir
- CSteam
- DOrdinary gas
12.Stirling and Ericsson cycles are
- AQuasi-static cycles
- BReversible cycles
- CSemi-reversible cycles
- DIrreversible cycles
13.The first law of thermodynamics is the law of
- AConservation of mass
- BConservation of energy
- CConservation of momentum
- DConservation of heat
14.The state of a substance whose evaporation from its liquid state is complete, is known as
- APerfect gas
- BVapour
- CSteam
- DAir
15.Boyle's law i.e. pV = constant is applicable to gases under
- AAll ranges of pressures
- BOnly small range of pressures
- CHigh range of pressures
- DSteady change of pressures
16.The efficiency of Carnot cycle is maximum for
- AGas engine
- BPetrol engine
- CSteam engine
- DReversible engine
17.The efficiency of Diesel cycle increases with
- AIncrease in cut-off
- BConstant cut-off
- CDecrease in cut-off
- DNone of these
18.The calorific value of gaseous fuel is expressed in
- AkJ
- BkJ/kg
- CkJ/m2
- DkJ/m3
19.The universal gas constant (or molar constant) of a gas is the product of
- AMolecular mass of the gas and the gas constant
- BAtomic mass of the gas and the gas constant
- CMolecular mass of the gas and the specific heat at constant pressure
- DMolecular mass of the gas and the specific heat at constant volume
20.The unit of energy is S. I. units is
- AJoule (J)
- BJoule meter (Jm)
- CWatt (W)
- DJoule/meter (J/m)