320 Important Engineering Thermodynamics MCQ Question and Answer | PDF Free Download
1.A tri-atomic molecule consists of __________ atoms.
- AThree
- BOne
- CTwo
- DFour
2.The atomic mass of nitrogen is __________ oxygen.
- AEqual to
- BLess than
- CMore than
- DNone of these
3.The throttling process is __________ process.
- AReversible
- BIrreversible
- CReversible or irreversible
- DNone of these
4.When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.
- AAtomization
- BCarbonization
- CCombustion
- DNone of these
5.Diesel cycle consists of __________ processes.
- ATwo constant volume and two isentropic
- BTwo constant pressure and two isentropic
- CTwo constant volume and two isothermal
- DOne constant pressure, one constant volume and two isentropic
6.An open cycle gas turbine works on
- AOtto cycle
- BCarnot cycle
- CJoule's cycle
- DStirling cycle
7.The mass of flue gas per kg of fuel is the ratio of the
- AMass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel
- BMass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas
- CMass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel
- DMass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas
8.For which of the following substances, the internal energy and enthalpy are the functions of temperature only
- AAny gas
- BSaturated steam
- CWater
- DPerfect gas
9.Water contained in a beaker can be made to boil by passing steam through it
- AAt atmospheric pressure
- BAt a pressure greater than atmospheric pressure
- CAny pressure
- DNot possible
10.The fuel mostly used in steam boilers is
- ABrown coal
- BPeat
- CCoking bituminous coal
- DNon-coking bituminous coal
11.The variables which control the physical properties of a perfect gas are
- APressure exerted by the gas
- BVolume occupied by the gas
- CTemperature of the gas
- DAll of these
12.Characteristic gas constant of a gas is equal to
- ACp /Cv
- BCv /Cp
- CCp – Cv
- DCp + Cv
13.The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)
- Arγ – 1
- B1 - rγ – 1
- C1 - (1/r) γ/γ – 1
- D1 - (1/r) γ - 1/ γ
14.Kelvin-Planck’s law deals with
- AConservation of work
- BConservation of heat
- CConversion of work into heat
- DConversion of heat into work
15.The gas constant (R) is equal to the
- ASum of two specific heats
- BDifference of two specific heats
- CProduct of two specific heats
- DRatio of two specific heats
16.The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
- AWork done
- BEntropy
- CPower
- DEnthalpy
17.The specific heat of air increases with increase in
- ATemperature
- BPressure
- CBoth pressure and temperature
- DVariation of its constituents
18.If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to
- A+ve
- B–ve
- CZero
- DAnywhere between zero and infinity
19.One watt is equal to
- A1 Nm/s
- B1 N/m
- C1 Nm/hr
- D1 kNm/hr
20.The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules.
- A1 g
- B10 g
- C100 g
- D1000 g