320 Important Engineering Thermodynamics MCQ Question and Answer | PDF Free Download
1.According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.
- ARemains constant
- BIncreases
- CDecreases
- DNone of these
2.The heat energy stored in the gas and used for raising the temperature of the gas is known as
- AExternal energy
- BInternal energy
- CKinetic energy
- DMolecular energy
3.In a steady flow process, the ratio of
- AHeat transfer is constant
- BWork transfer is constant
- CMass flow at inlet and outlet is same
- DAll of these
4.The temperature at which the volume of a gas becomes zero is called
- AAbsolute scale of temperature
- BAbsolute zero temperature
- CAbsolute temperature
- DNone of these
5.Which law states that the specific heat of a gas remains constant at all temperatures and pressures?
- ACharles' Law
- BJoule's Law
- CRegnault's Law
- DBoyle's Law
6.Which of the following is the property of a system?
- APressure and temperature
- BVolume and density
- CEnthalpy and entropy
- DAll of the above
7.Thermal power plant works on
- ACarnot cycle
- BJoule cycle
- CRankine cycle
- DOtto cycle
8.When gas is heated at constant pressure, the heat supplied is utilized in
- AIncreasing the internal energy of gas
- BDoing some external work
- CIncreasing the internal energy of gas and also for doing some external work
- DNone of the above
9.The change of entropy, when heat is absorbed by the gas, is
- APositive
- BNegative
- CPositive or negative
- DNone of these
10.The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.
- ABoyle's law
- BCharle's law
- CGay-Lussac law
- DJoule's law
11.For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order
- ADual cycle, Diesel cycle, Otto cycle
- BOtto cycle, Diesel cycle, Dual cycle
- CDual cycle, Otto cycle, Diesel cycle
- DDiesel cycle, Otto cycle, Dual cycle
12.The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
- AIncrease
- BDecrease
- CRemain unchanged
- DIncrease/decrease depending on application
13.A process, in which the temperature of the working substance remains constant during its expansion or compression, is called
- AAdiabatic process
- BIsothermal process
- CHyperbolic process
- DPolytropic process
14.A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
- AOtto cycle
- BStirling cycle
- CCarnot cycle
- DDiesel cycle
15.A cycle consisting of two adiabatic and two constant pressure processes is known as
- AOtto cycle
- BEricsson cycle
- CJoule cycle
- DStirling cycle
16.A cycle consisting of two constant pressure and two isentropic processes is known as
- ACarnot cycle
- BStirling cycle
- COtto cycle
- DNone of these
17.On weight basis, air contains following parts of oxygen
- A21
- B23
- C25
- D77
18.On volume basis, air contains following parts of oxygen
- A21
- B23
- C25
- D77
19.The fuel mostly used in blast furnace for extracting pig iron from iron ores is
- AHard coke
- BSoft coke
- CPulverized coal
- DBituminous coal
20.Work done is zero for the following process
- AConstant volume
- BFree expansion
- CThrottling
- DThrottling