320 Important Engineering Thermodynamics MCQ Question and Answer | PDF Free Download
1.Mond gas is obtained by
- APartial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
- BCarbonisation of bituminous coal
- CPassing steam over incandescent coke
- DPassing air and a large amount of steam over waste coal at about 650°C
2.The heat and mechanical energies are mutually convertible. This statement was established by
- ABoyle
- BCharles
- CJoule
- DNone of these
3.When a gas is heated at constant pressure
- AIts temperature will increase
- BIts volume will increase
- CBoth temperature and volume will increase
- DNeither temperature not volume will increase
4.Coke is produced
- AWhen coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
- BFrom the finely ground coal by moulding under pressure with or without a binding material
- CWhen coal is first dried and then crushed to a fine powder by pulverizing machine
- DBy heating wood with a limited supply of air to a temperature not less than 280°C
5.Entropy change depends on
- AHeat transfer
- BMass transfer
- CChange of temperature
- DThermodynamic state
6.Which of the following processes are thermodynamically reversible?
- AThrottling
- BFree expansion
- CConstant volume and constant pressure
- DIsothermal and adiabatic
7.Properties of substances like pressure, temperature and density, in thermodynamic coordinates are
- APath functions
- BPoint functions
- CCyclic functions
- DReal functions
8.The process is adiabatic, if the value of n in the equation pvn = C, is
- AZero
- BOne
- CY
- D∝
9.A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as
- ACracking
- BCarbonization
- CFractional distillation
- DFull distillation
10.All perfect gases change in volume by 1/273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called
- ABoyle's law
- BCharles' law
- CGay-Lussac law
- DJoule's law
11.When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
- AZero
- B1/5
- C4/5
- D1
12.Carnot cycle consists of
- ATwo constant volume and two isentropic processes
- BTwo isothermal and two isentropic processes
- CTwo constant pressure and two isentropic processes
- DOne constant volume, one constant pressure and two isentropic processes
13.Stirling cycle consists of
- ATwo constant volume and two isentropic processes
- BTwo constant volume and two isothermal processes
- CTwo constant pressure and two isothermal processes
- DOne constant volume, one constant pressure and two isentropic processes
14.Otto cycle consists of
- ATwo constant volume and two isentropic processes
- BTwo constant pressure and two isentropic processes
- CTwo constant volume and two isothermal processes
- DOne constant pressure, one constant volume and two isentropic processes
15.The efficiency of Diesel cycle with decrease in cut-off
- AIncreases
- BDecreases
- CFirst increases and then decreases
- DFirst decreases and then increases
16.The absolute zero temperature is taken as
- A237°C
- B-273°C
- C-237°C
- D273°C
17.The basis for measuring thermodynamic property of temperature is given by
- AZeroth law of thermodynamics
- BFirst law of thermodynamics
- CSecond law of thermodynamics
- DThird law of thermodynamics
18.Measurement of temperature is based on
- AThermodynamic properties
- BZeroth law of thermodynamics
- CFirst law of thermodynamics
- DSecond law of thermodynamics
19.The measurement of a thermodynamic property known as temperature is based on
- AFirst law of thermodynamics
- BSecond law of thermodynamics
- CZeroth law of thermodynamics
- DNone of these
20.First law of thermodynamics furnishes the relationship between
- AHeat and work
- BHeat, work and properties of the system
- CVarious properties of the system
- DVarious thermodynamic processes